The view from the control room of Chabot's planetarium during
the live LCROSS lunar impact event

Rewind to October 9th. It was a lot of fun watching the event up here at Chabot. We'd hoped to observe the impact through our 36-inch telescope, Nellie, but were clouded out. Fortunately, the main part of the show was brought to us via satellite from NASA—and from the vantage point of the LCROSS spacecraft, on its collision course with the Moon, where terrestrial weather was not a factor.

Our planetarium was filled—overfilled actually; we had to open up our theater across the hall as an overflow viewing area! Mind you, it was 3:00 in the morning on a Friday, and still over 300 people showed up in various states of caffeination.

I set up the planetarium to resemble the control room of a futuristic starship: a huge spinning animation of the Moon overhead, and several large projections showing simulations of the impending impact, recent images from other lunar missions, and, front and center, the view from NASA, which alternated between Mission Control at Ames Research Center and a live view from the LCROSS spacecraft itself.

The view from LCROSS showed an ever-nearing wall of lunar craters and topography as LCROSS homed in on its fate. The announcement was made that the primary impactor, LCROSS's Centaur upper rocket stage, had impacted, and we all strained our eyes looking for the plume of dust the impact was hoped to produce. But, the impact didn't create as visible an ejecta plume as expected; we stared on, but only saw the wall of craters loom closer and closer.

The four minutes between Centaur impact and the inevitable impact by LCROSS itself ticked by, and we held our breaths. Then, the image went blank, and NASA announced that LCROSS had impacted the Moon. Though we didn't see the plume, it was exciting to ride along with LCROSS to its end, and live to tell about it. Next better thing to being there….

Back to the water. Though no plume of dust was seen by LCROSS's main visible camera, that's not all it had in its toolbox of instruments. Most revealing was data collected by LCROSS's spectrometer—the device that sorts out the wavelengths of light and discriminates the specific wavelengths emitted by specific chemicals. Water (H2O) and hydroxyl (OH) seem to have been present in the dust plumes kicked up from the permanently shadowed floor of Cabeus crater, at the lunar south pole.

And more: other volatile chemicals—whose identities will no doubt be revealed by NASA in coming months in the due course of their data analysis—appear to have been detected in the impact plume.

How much water? Are we talking vast sheets of solid ice, glaciers, and land-locked icebergs? Well…though NASA hasn't yet characterized the quantities of water inferred by LCROSS's detection, the serene waters of Cabeus likely are a mixture of lunar soil and ice—a substance you'd have to work at to extract pure water from.

For more exciting discoveries to come, stay tuned to the Moon….

Geek Out by taking the Mars Survival Challenge

Forget the challenging landscapes of the Arctic or Everest; if you want a true survival test, how about Mars? Our red neighbor has inspired thousands of intrepid explorers (and a number of awful movies) to formulate colonization plans. With a little help from Google Mars, you can choose plot near all the important landmarks: Valles Marineris, Olympus Mons, or even the famous northern polar ice caps.

Thanks to our friends at the Lawrence Hall of Science, you too can help the colonization effort. At their Geek Out event on 11/18, you’ll be able to design your own Mars Base. There will be experts on hand from the SETI Institute and NASA to provide some info on the Martian landscape and what it takes to survive there.

You’ll be able to videotape your landscape to share with the rest of the universe. Who knows, the first ever Martian colony could be named after you!

This is the 2^nd LHS Geek Out event, a new monthly science series for adults. The evening will be full of interactive science, music, and cocktails. There is also a free shuttle from the Downtown Berkeley BART to the museum. For a primer, check out this video from the 1^st Geek Out event.

LHS Geek Out: Mars Survival Challenge
When: Wednesday 11/18, 7-10 PM
Where: Lawrence Hall of Science, Berkeley
Cost: $10, $8 for members and UC Berkeley Students
Details: Come to Lawrence Hall of Science, grab a drink and a friend, and get ready for some downright nerdy fun. All events include full access to exhibits, a cash bar, hors d’oeuvres, and of course the best view in the East Bay. Program is for adults only.

Bumps and ripples in the otherwise flat ring system of Saturn cast long shadows at equinox. Image credit: NASA/Cassini

Hard to imagine what it would be like to float just above the rings of Saturn, but what a sight it must be! As a kid, one of my favorite astronomical pass-times was imagining the view from other places in the Solar System.

Now imagine a towering bulge of frosty mist rising up out of this super-flat plane of ice chunks, literally the size of a mountain. Such is what was beheld by NASA's Cassini spacecraft last month–albeit, from a distance–when it turned its cameras to Saturn's vast rings during the few days surrounding Saturn's equinox (August 29, 2009), giving us a view never before seen.

Equinox on Earth, when the Sun is positioned directly over our equator, happens twice a year. Due to Earth's tilted rotational axis, as we orbit the Sun the latitude over which the Sun shines directly cycles north and south between the latitudes of the Tropics. On its way north to warm our (Northern Hemisphere) summers or south to leave us in the chill, the Sun crosses the equator on the equinoxes (Fall and Spring).

The same thing happens on Saturn, with two differences. First, Saturn takes nearly 30 years to orbit the Sun, so equinox comes only about every 14 years. Second, Saturn has its system of rings that encircle the planet directly above its equator, serving as a visible extension of the equator. At Saturn's equinox, the Sun is not only directly over the equator, but sunlight strikes the rings edge-on, like a flashlight shining on a flat piece of paper from the edge, the light just grazing over the surfaces on either side.

When this happens, any deviations from the flatness of the ring system—bumps and ripples–cast long shadows across the rings, making the features much easier to see. The same thing is seen on that piece of paper with shadows from creases and bumps leaping across the page.

As seen from Earth, equinox on Saturn means the rings appear to vanish as we look at them edge-on. This behavior puzzled astronomers long ago before they understood the rings for what they are. During the August 2009 Saturn equinox, however, for the first time in history we had a bird's-eye view of the rings during equinox, from Cassini. Cassini has been in orbit around Saturn for five years now.

Cassini spotted a number of prominent shadows trailing bright spots and ridges—bumps and ripples of different sorts rising above the ring plane.

Some of the bumps–icy ring material kicked up by the gravitational disturbance of a small moonlet inside the rings–were measured at over two miles high, the height of the Rocky Mountains. Other rippling features, such as long ridges running along the direction the rings encircle Saturn, are waves created by the gravity of moons orbiting outside the ring system. Still other types of disturbances observed are possibly caused by the impact of meteoroids or chunks of ice with the rings.

Saturn's rings are tens of thousands of miles across, but are extremely thin—perhaps no thicker than the height of a four-story building! So a bump or ripple as high as a mountain is a big deal!

Ah, to be on Saturn, now that equinox is here…

Map of Moon water; blue indicates higher concentrations of detected water molecules. Credit: NASA/Moon Mineralogy Mapper instrument.

In one short week, NASA's LCROSS (Lunar Crater Observation and Sensing Satellite) mission will quite literally come to an end—a fiery, spectacular end as it deliberately crashes into the lunar South Pole crater Cabeus A in hopes of kicking up enough material for us to detect the presence of water. If you want to see the action as it happens, come up to Chabot Space & Science Center on Friday morning, October 9, 3:00 AM to watch NASA's live simulcast and–weather and the gods of astronomy permitting–the view through Chabot's 36-inch telescope, "Nellie."

In recent months, NASA has been sending a lot of acronyms—excuse me: spacecraft—to the Moon: LRO with it's LROC, LEND, and LOLA instruments; LCROSS (which I've heard some call "LaCROSS," for the record) with its VIS, NIR, MIR, TLP, VSP, NSP—oh, the list goes on!

The fact of the matter is MOON spells "Moon." Whether or not we do end up returning humans to the Moon in the next decade, which is partly what reconnaissance by LRO and LCROSS and their arrays of acro-instrumentation is for, there are still things to be learned about our nearest neighbor in space—and water is the word at present.

Even as LCROSS and its Centaur-booster-rocket-turned-lunar-clobbering-device follow their final fatal trajectory toward Cabeus A, its launch buddy LRO, now in an orbit around the Moon and beginning to send back scientific results and images, may have already detected telltale signs of the wet stuff—which on the Moon won't be wet, but frozen solid, of course; liquid water cannot persist in the Moon's airless environment.

LRO's LEND (Lunar Exploration Neutron Detector) instrument is designed to find signs of water molecules by measuring neutron radiation emanating from the lunar surface. The Moon is constantly bombarded by high energy cosmic radiation, which forms radioactive isotopes in the soil that in turn emit neutrons. By measuring the abundance and speed distribution of the neutrons, details of soil chemistry can be inferred. The presence of light atomic nuclei–in particular the lightest of all, hydrogen, a component of water—in the soil reduces the levels of neutron emission. That drop in neutron radiation is the telltale scientists are looking for.

While LRO scientists want to make further measurements before concluding the presence water ice concentrations, observations from three other spacecraft—NASA's M3 instrument (Moon Mineralogy Mapper) aboard India's Chandrayaan-1 spacecraft and the Cassini and EPOXI spacecraft—have mutually confirmed the presence of water and hydroxyl molecules (hydroxyl is a water molecule missing one of its two hydrogen atoms) in the soils of the Moon, across much wider expanses than the confines of dark polar crater floors.

Cassini and EPOXI made measurements as they flew past the Moon to their respective destinations (Saturn, and a comet), and measurements have been made by M3 from lunar orbit. The detection of water by these spacecraft doesn't mean seas of liquid or glaciers of ice, or even blanketing layers of gaseous water vapor, but rather relatively small amounts of water and hydroxyl molecules attached to, or "stuck to," other materials in the top few millimeters of soil.

This thin "confetti" of water molecules appears to come and go with lunar daytime, forming during the cold, dark two-week-long lunar night and diminishing under the baking light of the Sun.

So, right now, MOON spells water (M3 et al), water (LRO), and possibly more water (LCROSS, on October 9th)—at least, the evidence seems to be mounting!

As the impact grows closer, NASA is making an effort to talk about the locally driven mission. Many of the upcoming talks are suitable for any audience, from kids to adults.

Luna Philosophie: Hitch-hiking to the Moon

Where: Scribd, 539 Bryant St. (2nd Floor), San Francisco

When: Wednesday, 9/23 6-8 PM

Cost: Free, RSVP to Delia.L.Santiago@nasa.gov

Details: Dr. Kim Ennico, LCROSS Payload Scientist and the LCROSS Payload Integration & Test Manager, will provide an overview of the NASA LCROSS mission and discuss how NASA has been expanding the concept of “participatory exploration” with LCROSS as an example. This will be a lively discussion.

Andrew Chaikin on LCROSS

Where: Chabot Space & Science Center

When: Saturday, 9/26 3-430 PM

Cost: Free with Museum Admission

Details: Author, speaker, and space journalist Andrew Chaikin joins Chabot visitors for a night of moon conversation and exploration. Using the detailed program Google Moon, which he helped to develop, Chaikin takes the visitor on a guided tour of the moon’s surface. Chaikin will also discuss the recent LCROSS mission and his extensive knowledge of the Apollo missions.

To the Moon: A Look at NASA’s Upcoming Lunar Impact Mission and the History of Moon Exploration

Where: Exploratorium

When: Sunday, 9/27 2-4 PM

Cost: Free with Museum Admission

Details: Take a trip to our nearest neighbor in space with renowned science journalist and space historian Andrew Chaikin. Relive the achievements of Apollo lunar astronauts and learn about the ambitious LCROSS mission, which will send a rocket crashing into the moon’s permanently shadowed regions to kick up huge plumes of debris in the hopes of uncovering deposits of ice. In addition, Exploratorium educators will give an entertaining and interactive overview of moon science.

QUEST on KQED Public Media.

Block Island—a half-ton meteorite found on Mars by NASA's Opportunity rover.Image credit, NASA/MER Opportunity

Okay, dramatic desert car scene ended. That would be the Hollywood movie version of what NASA's Mars Exploration Rover Opportunity did recently, on the lonely desert highway that it's scouting on Mars.

On its determined long trek from Victoria Crater to the larger Endeavour Crater (a 12-mile span that Opportunity has completed about one fifth of over the past year), the rover passed by an X-box-sized block of iron that presented the appearance of a meteorite. It snapped a picture in passing, which was eventually transmitted to Earth and examined. By this time, Opportunity had already traveled about 180 meters beyond the block (dubbed "Block Island"). This is when the rover was commanded to backtrack all the way to the find (though it's doubtful it worked up a rooster tail).

Upon returning to Block Island—quite obviously an iron-nickel meteorite by appearance alone, but whose composition was confirmed by the rover's alpha particle X-ray spectrometer instrument—Opportunity took more pictures, including extreme close-ups with its microscope camera, which revealed surface patterns similar to those found on Earth iron-nickel meteorites that have been exposed to long-term weathering by wind and sand.

As interesting as stumbling upon a half-ton meteorite on the dusty plains of Mars' Meridiani Planum is, what this particular chunk of weathered iron is telling scientists sparks the imagination. In a nutshell, given the thinness of Mars' current atmosphere, scientists wouldn't expect a meteorite of this size to survive impact intact, at the speed it would be going. One of the possible explanations for Block Island's rock-houndable state is that when it fell to Mars, Mars' atmosphere was substantially thicker than it is now.

Further examination of the meteorite may reveal clues as to how long ago it fell through Martian skies. Evidence that Mars' atmosphere was warmer and thicker in the distant past, as well as the possibility that there was liquid water on the surface, has been mounting over the years. The age of this meteorite-fall could shed more light on the history of Mars' environment. If it fell billions of years ago, Block Island would weigh in as more evidence to support our current suspicions. If, however, we find that it fell more recently, then this could indicate that the atmosphere was more substantial later in Mars' history than we thought.

Imagine, if you will, a Mars that looks even more Earthlike than it does now: seas of water with waves rolling into shorelines, great clouds sending downpours of rain and snow onto mountains and plains, streams and rivers snaking through the landscape. Maybe, maybe, even some form of life?

All that from a rock? Yes, rocks talk, if we listen.

Neil Armstrong’s left boot print on the Moon—the celebrated ‘one small step’. Credit: NASA

I was in Oakland, lying on the green carpet of my family's living room floor, watching our black and white Zenith television set—the kind that would take a minute or so to warm up before delivering the handful of local VHF TV broadcasts within range of our aerial antenna.

Right. It was definitely another era. As archaic as the telecommunications technology may sound to those born after, oh, 1980, it was nevertheless the Space, not Stone, Age…. Never forget, the Apollo 11 landing on the Moon was the culminating moment of the whole adventure that started the Space Age.

It didn't really matter that our Zenith was a b/w set, as all the images from Apollo 11 and the Moon's surface were transmitted in black and white anyway. My eyes were riveted to the TV, the grainy, fuzzy image of the Eagle's landing strut and ladder as yet empty.

"What's taking them so long?" I complained impatiently (I was seven years old). I remember waiting for what seemed a couple of hours for the astronauts to come out.

"They're probably playing poker inside," was my dad's reply. I don't recall if I believed him or not. Finally, there was a booted foot at the top of the ladder, attached to the bulky white and gray form of a human in a space suit—Neil Armstrong, of course. And, history was made—twice: Buzz Aldrin came down the ladder soon after.

Some of you younger crowd may have been born into a world where humans walked on the Moon a long time ago, but I was born around the time it was actually happening. (In fact, I was born the year after the first human went into space; similarly my grandfather was born the year of the Wright Brothers' first aerial success—how time flies….)

On Monday, we not only mark four decades since that singular historic event, we do so at a time when there are plans afoot for humans to step onto the Moon once again.

Several robotic probes have gone Moonward in recent years, paving the way: Clementine, Lunar Prospector, and only last month the Lunar Reconnaissance Orbiter (LRO) and the Lunar Crater Observation and Sensing Satellite (LCROSS) were launched in tandem. LRO will give us our most detailed and comprehensive view of the Moon's surface appearance and conditions to date, and will help to identify future possible landing sites. LCROSS will look for water ice in a crater floor at the Moon's South Pole by impacting it with an empty booster rocket and studying what is blasted skyward. Water on the Moon would be a resource to future human missions far more valuable than gold.

Neil's left boot print is still up there, next to the Eagle's landing foot, most likely as fresh and new looking as when it was made (unless it got bulls-eyed by a one in a million meteorite strike!).

As there is no air, and thus no erosion, on the Moon, the print serves equally well as a monument to that decades-ago venture, or as a logo for the enterprise of our return. Fitting, too, as the Moon could serve as a stepping stone to destinations beyond….

Credit: NASA.

When the LCROSS satellite, nicknamed Centaur, smacks into the south pole of the moon in late October, it is expected to produce a plume of dust 37 miles high, which may be visible from Earth with a good backyard telescope. It will be visible in an arc from Hawaii to Texas.

If you'd like to catch the impact, the Chabot Space and Science Center in Oakland is hosting a Shooting the Moon star party on the night of impact. Morrison Planetarium in San Francisco may host a star-gazing event, as well, but it hasn't been announced yet. And you could check in on other observatories in the Bay Area, as well: Lick observatory in the Santa Cruz mountains, Foothill observatory in Los Altos Hills, Sonoma State observatory in Rohnert Park, and the Fremont Peak observatory in the East Bay.

Not all of them will be open to the public; for instance, Foothill Observatory will be closed to the public, because they’ve been asked to take photographs of the event.

If you know anyone with a 10-inch telescope (that's the diameter of the lens), you can bet that telescope will be lined up to look skyward when the LCROSS probe hits the moon.

If the impact goes well, then the plume above the moon's surface could hover there for hours. It will make its own crater on the moon about 6 feet deep and 30 yards wide, so the plume of dust will not be visible to the naked eye, or even through binoculars.

The exact date, time and even the exact location of the impact have not yet been determined. Keep your eye on NASA's site for more information.

And one aside: This impact will not hurt the moon, or send it off its orbit. That may seem apparent to many people, but NASA Ames officials say those are the most-asked questions about the project.

Listen to the Crash Landing radio report online.

The Hubble Space Telescope being serviced by Space Shuttle
Atlantis astronauts in May 2009. Credit: NASA

Galileo's telescope had a magnification of only about 27x, allowing him to see that Venus has phases like the Moon, Jupiter has four large moons of its own, Saturn does not appear as a simple disk but has unusual "projections" to either side, and the Milky Way contains far more stars than is apparent to the naked eye. And though these are features that can be seen through the least powerful home telescopes today, Galileo's observations changed the way we look at the universe.

Hubble has done the same thing, but on a modern scale of magnitude. Not a large telescope by the standards of ground-based behemoths like Keck in Hawaii (Hubble's primary mirror is 2.4 meters in diameter), Hubble's "edge" is it's location in space, orbiting the Earth over 300 miles high, outside of our atmosphere. Particularly in its earlier days before ground based telescopes were using adaptive optics techniques to compensate for atmospheric distortion, Hubble's vision on the universe was unparalleled in its clarity.

Here's is a recap of a few of the many big discoveries Hubble has made possible:

Dark Energy: By accurately measuring the distance and velocity of distant supernovae, over a large range of distances, Hubble has refined out knowledge of the rate of expansion of the universe–leading to the discovery that the expansion of the universe is actually accelerating, contrary to what was expected. Scientists suggest the existence of a mysterious "dark energy" throughout the universe that exerts an antigravitational repulsive pressure on the cosmos.

Age of the Universe: Since Edwin Hubble (for whom the Space Telescope was named) discovered that the universe is expanding, astronomers have been trying to determine how long ago the expansion began–how long ago the "starting gun" of the Big Bang was fired, and thus the beginning of the universe. Through precise observations with the Hubble, astronomers in recent years have been able to peg it between 12 and 14 billion years. (Most recently, observations made with the WMAP mission have honed that down to 13.7 billion years, give or take 0.13 billion.)

Supermassive Blackholes: Hubble found the clues that point to the existence of "supermassive" blackholes at the heart of maybe most–or every–galaxy. The Milky Way's own central blackhole has a mass equivalent to four million Suns.

Stellar Dust Disks: Before the first extrasolar planets were actually detected, Hubble observations revealed that flat disks of dust encircling young and developing star systems–aka "protoplanetary disks"–is commonplace. This has given us a glimpse at what our own solar system may have looked like before the planets formed.

It has been seven years since the last Hubble servicing mission, with another servicing scheduled a few years ago cancelled in the wake of the Columbia disaster. Several failing systems will be repaired or replaced this time, and other instruments are receiving upgrades that will make Hubble more powerful than ever in its declining years.

This mission to service the Hubble will be the last. Since NASA is retiring the Space Shuttle fleet after 2010, we will no longer have a space vehicle large enough to carry upgrade and replacement equipment to and from the Hubble. After that, the next new big space-based descendent of Galileo's spyglass will be the James Webb. Stay tuned…

Cal Poly's CP-4 mini-satellite in orbit. Credit: The Aerospace
Corporation.

It's a classic engineering story – a garage inventor spends years working in isolation, only to produce something that gets the attention of the world. Ok, the CubeSat story may not be quite as romantic, but it does have a lot of the same ingredients.

Professors at Stanford University and Cal Poly created CubeSats – 10 by 10 by 10 centimeter mini-satellites – as enginneering projects to give their students hands-on experience. Compared to standard satellite missions, which can run hundreds of millions of dollars and take years to complete, CubeSat missions are mean to be done cheaply and quickly.

CubeSat is also a standard – a basic blueprint that any university program can use. CubeSats are actually known as "FedEx satellites," since universities can mail them to Cal Poly to arrange a ride into space. They've created launching devices called P-Pods (a box that fits the CubeSats perfectly) so they can piggyback on larger rocket launches. Once the main cargo is deployed, the P-Pod releases the CubeSats into orbit. Depending how high they are, CubeSats can orbit for more than a decade before they burn up in the atmosphere.

What started at universities has spread – NASA, Boeing and other aerospace companies all have mini-satellite programs. Despite the small size, CubeSats are actually able to do valuable research. They can space test new technology, submitting it to all the rigors of space travel like solar radiation and launch stress. Recreating those conditions on the ground can be very expensive.

CubeSats can also gather scientific data. On Tuesday, NASA will be launching Pharmasat, which they hope will be their second nano-satellite in orbit. It will carry yeast samples, and once in orbit will hit them with an anti-fungal to see if their resistance is increased in space. NASA has previously observed that some bacteria are more resistant to antibiotics in space, something that could be dangerous for future human space travel.

You can tune in on Tuesday evening for the Pharmasat launch. Three other CubeSats from Cal Poly and other organizations will also be getting a lift into space.

Listen to the Do-It-Yourself Mini-Satellites radio report online, and see our Web Extra: Mini-Satellites Slideshow.