Showing posts with label europa. Show all posts
Showing posts with label europa. Show all posts

Friday, December 02, 2016

More Marvels from Space!

Time to take a breather to recall we're still a magnificent, outward-looking, scientific civilization.  Though I will add a time-sensitive political note, at the end. Especially for all you brainy folks who pin your hopes on salvation by the Electoral College.  Only now...

...on to wonders of Space!

Breathtaking....See this spectacular composite image of Pluto from NASA's New Horizons probe. Then consider: this imagery was taken in blackness deeper than any night you ever knew, amid lifeless, bitter cold. And see more gorgeous Pluto pix and Charon’s mysterious (now explained) red polar caps!

The planet is fully tidal-locked with its big moon, Charon, showing only one face to each other. The heart-shaped region Tombaugh Regio (I once met Clyde Tombaugh) is exactly opposite Charon.  Read what this seems to imply… including a possible sub-surface ocean.

Now take this note of consolation: You are a member of a nation and civilization that does this sort of thing. We did this. We do this.

Remember that. Let it gird and support you.

Water plumes from Europa’s south pole! This suggests that the moon’s vast ocean may be closer to the surface than we thought and might be sampled without having to melt or drill our way down. (At NASA's NIAC we are funding some weird-cool ways to get science done there._

See the latest op-ed by Ed Lu of the B612 Foundation, which aims to detect all the potentially Earth threatening asteroids. An important topic! Especially since we might also mine these for resources! (Disclaimer: I am on their advisory board.) 

Good bye RosettaThe Rosetta probe, which has orbited Comet 67P/Churyumov-Gerasimenko for two years, has collided with the comet. Thanks for proving my doctoral thesis! 

Don't miss this great article from the New Yorker on the OSIRIS-REx mission to sample an asteroid.

== More on Mars and the Moon ==

Hot news from Mars! Radar inspection of Utopia Planitia revealed a deposit of water ice – as much as in Lake Superior – in a relatively flat, low latitude region the size of New Mexico. The layer ranges in thickness from 260 feet to 560 feet (80 to 170 m) and is made up of 50 to 85 percent water ice.  

A fascinating re-examination of results from the 1976 Viking Lander on Mars, the only one to explicitly look for life, which gave us ambiguous results. This new paper suggests that maybe Viking found life, after all.  

Back to the Moon? The Bushes & co. made a repeat of Apollo the centerpiece of their space ambition. It became GOP dogma to join Russia, China, Japan, Europe, India and several billionaires, all flocking to return to a sterile ball without any near-term usefulness or interest by scientists. Now, we see indications that the Trump administration will drop all Obama Era endeavors aimed at the fantastic riches to be found on asteroids, in favor of "been there, done that."

As an adviser to one of NASA's innovative-oriented directorates, I know about all sides of this argument. And there is an overlap of interest in one area, creating a cis-lunar station in orbit above the Moon. It is an ideal spot for both retrieving and studying asteroidal samples and offering services (for pay) to those wannabe copycat nations aiming to brag about being neo-Apollos. That part makes sense. But for that reason, don't expect to see it.

No, what this shows is that the Worst Man in America -- George F. Will -- is wrong in proclaiming Donald Trump to be "a false republican." DT's appointments so far are amplifications, not reversals of standard GOP crazinesses. And his policies toward science and space -- like ending all NASA Earth-science work -- differ from the Fox-propelled line only in being farther to the right.


== Further out in space ==

The most detailed 3D map yet of a billion stars in the Milky Way galaxy includes precise positions and brightness of 1.142 billion stars, plus distances and motions of more than 2 million of them.  You can navigate!  Courtesy ESA’s wonderful GAIA mission.

Space “blobs”! Ten times the diameter of the Milky Way! Glowing! Finally Explained! 

Boyajian’s Star (KIC 8462852) is one of the strangest discoveries of the Kepler mission, which vastly expanded our catalogue of alien planets.  Only in his case, the pattern of light dimming from the star cannot come from planetary eclipses, or even a disk of dust. The star not only dims up to 20% at intervals, it has been secularly dimming across observations spanning a century.  It is hard to accommodate both the long-term dimming and the lack of infrared and submillimeter emission. Explanations (discussed here before) range from internal stellar fluctuations to interstellar blockage of some kind, all the way to vast, alien architectural projects. 

Our galaxy may be more complex than a regular spiral. It’s already been reclassified as one of those “barred” spirals.  Now it seems the “Orion Spur that we sit amid is more than just a spur, but a complex – if not complete – spiral arm in its own right. 

== Exploring Earth ==

Read a fine and moving review – on Centauri Dreams – of Dr. David Grinspoon’s new book (blurbed by yours truly). In Earth in Human Hands: Shaping Our Planet's Future, David Grinspoon relates the question of our own survival as we deal with the so-called Anthropocene, a time when our technologies are increasingly affecting our planet, creating a new set of challenges to survival.

Thank Heavens. The GOES-R satellite is in orbit, safe from sabotage. It will nail down climate matters with great accuracy. The Bushites canceled almost every program to study climate and while Obama reversed course, it was hard getting money from Congress. This may be all we get for a long time.

This Japanese company's plan for a real world space elevator garners at least a mention... though I expect some cynicism below, in comments. 

A wonderfully inspiring story about the black women engineers and mathematicians who were deeply involved in the early space program. Hidden Figures: The American Dream and the Untold Story of the Black Women Mathematicians Who Helped Win the Space Race, by Margot Lee Shetterly. An except from the interview with the author on the New York Times:

'Some of the white male engineers seemed almost puzzled by the bigotry of the time — they saw a problem that needed to be solved, by the smartest person available. Do you think there’s a connection between the clarity and precision of mathematics and engineering and the ability of NASA and its predecessor, the National Advisory Committee for Aeronautics, to employ people of color? Yes, though at the same time, this institution was also on the front lines of a lot of these conflicts and national emergencies: World War I, World War II, the Cold War, the space race. They needed all hands on deck. Like: “We don’t have enough computers? Where are we going to get them? Oh, there are these black women, at this black school, that’s right across town? Let’s get them in here.” There was a bit of an emergency sensibility a lot of the time."

== METI redux ==

The StarTalk science and astronomy site runs fascinating podcasts. In a recent episode (as of October 18: 7pm EST) host and astrobiology maven David Grinspoon ("Dr. Funkyspoon") interviews astronomer and science fiction author David Brin about a wide range of matters including the Search for ExtraTerrestrial Intelligent civilizations (SETI). They answer fan-submitted Cosmic Queries about communicating with aliens. 

A new book, Waiting for Contact: The Search for Extraterrestrial Intelligence by Lawrence Squeri offers a cogent, engaging history of humanity's most ambitious quest - seeking outward for other minds. 

This Smithsonian Magazine article by Michael Chorost describes the “Cosmic Call” beaming from the Evpatoria dish in Crimea, in 1999. 

The article does point out (lightly) the fact that dozens of researchers in astronomy, SETI and related fields have protested against stunts such as this "cosmic call." These include former NASA SETI head Dr. John Billingham and former senior US diplomat Michael Michaud, who led the commission that drafted the SETI Protocols. A majority of workers in SETI, in fact, consider such METI stunts -- Messaging to Extra-Terrestrials - to be at-best affronts to grownup scientific process, in which we are expected to vett our projects openly and listen, when peers and others complain about potential for harm. These fellows (and some of them are friends of mine) are so gushy gung-ho that they shrug off every complaint or request to talk it over, before blaring "yoohoo!" into the cosmos.

To be clear, we do not expect these beamings to draw slathering alien invaders tomorrow. But when you aim to alter some principal observable characteristics of our planet, is it too much to ask for an environmental impact statement? And some discussion? For example, examining the history of past HUMAN first contacts between different cultures? Every one of which led to pain?
Those who zealously admire these shout-stunts tend to have the right instincts! To look outward and explore the cosmos. As an astronomer who also has done well with science fiction novels, I approve of the reflex, wholeheartedly! I've spent my whole life pondering the alien. But when people dive into the matter -- as they can do in this article and in this debate...
... they always come away both more informed and more willing to say: "Let's pause and talk over the ramifications, first."
Alas, there are zealots who are so confident in their evidence-free assertions and assumptions that they rush to wager their children -- and yours and mine -- that the universe is nothing but a Sesame Street-Barney wunderland. Oh, please let it be so.
An animated introduction to the Fermi Paradox. A bit simplistic and off by a few factors. But interesting.
And from xkcd:
and (almost) finally...XKCD makes fun astronomical comparisons!  

== And for you, who pray to the Electoral College ==

1- Don't expect salvation from the Electoral College. Yes, there'll be more defections-of-conscience than ever before. Some electors are talking out options, as a "college" should. Like matching Clinton and Trump abstainers, or voting for a sane republican, making Paul Ryan take responsibility. There's even a "Kasich Gambit." Ohio's electors could almost do it all by themselves.

I had no success with my own great idea... getting some billionaire to offer an all-expense-paid actual meeting of the Electoral College, at some resort - for the first time in 240 years - letting them talk it out, free of outside interference. Too late, I guess. Ah, judgement, thou art fled...


2- At last, someone offers a $100K reward for anyone bringing forward conclusive evidence of election fraud. I've begged for this. The reward should be 10X larger, (with help from a zillionaire), plus offers of immunity, hero status and talk show gigs.

Oh, and whistleblowers reap 20% of whatever the U.S. gets, when conspiracies are nailed!  


Crowdfund this, asap.





Sunday, November 30, 2014

Space Marvels - galaxies, space-power, "my" asteroid... and comets...

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One of the best things I have ever watched: Invest four minutes for the video clip Wanderers! This -- rather than anger and cynicism -- is what being human must be about...or else, why bother?

Oh, also note: almost all of the places depicted here are real. Many of them extrapolated from photos taken already by our robot emissaries. “We” have already been to these wondrous spots. We are already titans!  On our way to unimaginable greatness.

(Though I will keep trying to imagine.)

== As we move ahead... ==

Could life exist in the Kracken Mare Sea on Titan?  I am working on stories… but right now I am simply jazzed by this image… sunlight glinting off one of Titan’s “seas” of liquid… methane? Ethane? Gasoline?  Take a look at the video: NASA's Cassini captures sunlight glinting off Titan's seas.

You are a member of a civilization that does stuff like this!  Stop letting cynics and fear-mongers undermine your confidence in us.

NASA's New Horizons spacecraft comes out of hibernation on December 6 -- in preparation for an encounter with the dwarf planet Pluto. Closest approach will take place in July. 


NASA/JPL have just released a gorgeous new high-resolution image of Europa -- its icy surface crisscrossed by cracks and ridges. Beneath its icy surface, Europa may have more liquid water than Earth. In NASA's video: Europa: Ocean World, astrobiologist Kevin Hand discusses the possibility of life on Europa. Phil Plait’s “Bad astronomy” site offers a cool riff about a possible mission to Europa. 

It is estimated that Europe’s new Gaia probe will have discovered some 20,000 Jupiter mass exoplanets by the time it completes its survey in 2019. Unlike the transit-eclipse system used by the Kepler mission to discover most of the 2000 or so confirmed exoplanets, Gaia will use the astrometric measurement technique, where planets around another star show up as a tiny wobbling motion of the star as the planet orbits around it. Somewhat less likely to discover Earthlike smaller worlds, Gaia will be far less dependent on just happening to find systems whose ecliptics are lined up toward us.  It will also be far better at detecting planets that orbit farther from their star.

Here’s a fascinating astronomy blog that takes on some big topics. This particular posting tells of Antarctic lichens that seem to have adapted well to  Mars-like conditions.... amazing in its tentative implications.

== New Insights into Galaxies ==

Scientists believe a mysteriously bright object in a galaxy 90 million light-years away could be a rogue black hole evicted during the merger of two galaxies.

A really thought provoking paper suggests that of the estimated 100 billion galaxies in the observable universe, only one in 10 can support complex life like that on Earth. The reason, most other galaxies are either smaller or lower in “metalicity” and therefore have many more Gamma Ray Burst events that can destroy the ozone layers of life-worlds for thousands of parsecs in all directions, conceivably knocking down all but the most primitive, ocean dwelling organisms, making galaxies resemble the image Isaac Asimov portrayed in his novels, one with scads of biospheres, owned only by single cell life forms.

Short gamma ray bursts last less than a second or two; they most likely occur when
 two neutron stars or black holes spiral into each other. Long gamma ray bursts come from supernovae.

Tsvi Piran, a theoretical astrophysicist at the Hebrew University of Jerusalem, and 
Raul Jimenez, a theoretical astrophysicist at the University of Barcelona in Spain, 
explore that apocalyptic scenario in a paper in press at Physical Review Letters.

Compared with the Milky Way, most galaxies are small and low in metallicity. As a
 result, 90% of them should have too many long gamma ray bursts to sustain life, 
they argue. What’s more, for about 5 billion years after the big bang, all galaxies were
 like that, so long gamma ray bursts would have made life impossible anywhere. And inward of 10,000 light years from the center, our galaxy is still dangerous.

Researchers sending up NASA’s Cosmic Infrared Background Experiment on short duration rockets  have discovered something remarkable in the universe's diffuse background light: As many as half of the stars in the universe may have been stripped from their home galaxies and flung into space. Studying the extragalactic background light, Caltech astronomers  say there's just as much background starlight coming from these dim rogue stars as is coming from all of those giant galaxies.

== Reaching toward the sun ==

 A probe will be sent to visit the Sun.  I am interested - of course - in any human effort to … er… sun-dive.  Only there is an interesting design twist here.  Solar Orbiter will have a titanium foil heat shield on the outside painted black, with a hint of charred animal bone.

A very interesting exploration by Keith Henson of the economics and practical aspects of   lifting to GEO a solar power satellite system whose first use would be to laser heat the exhaust of Skylon lifters taking yet more solar power systems to GEO.  A bootstrap method that could (in theory) soon result in vast amounts of clean energy coming to us from the sun... via our collectors in space.

Some portions of this method have received preliminary seed grants from us at NASA NIAC. But many other sources will have to solve many puzzles along the way. It's good to have folks pushing this... while others push to make it unnecessary by vastly improving solar here on Earth.

== Comets and Asteroids ==

Given the results that have come in from the Rosetta Mission's rendezvous with a comet, I thought I'd offer you all a glimpse at my 1981 doctoral dissertation! It dealt with what happens when an icy mix of volatiles and grains gets heated from above. Naturally, some volatiles (e.g. water) sublimate and leave at high molecular velocities -- that get higher as the comet approaches the sun. Large dust grains may stay put but smaller ones get entrained into the escaping stream and become part of the Dust Tail. (Comets have two tails.)  

This means a mantle or coating layer of larger grains starts to build.  This will eventually be thick enough to shield the virgin material, slowing down the rate of sublimation.  Like a thermos coating. But the comet is heading sunward so the grains get hotter and a wave of heat penetrates inward, causing a delayed but large pulse of sublimation which will, here and there across the surface, cause an explosive blow off of the covering mantle, resulting in a surge of heavier grains in the dust tail and venting off pressure from an area.  Some of the heavier grains then rain down elsewhere on the comet surface, causing some areas to build such big layers that they choke off, semi permanently.  When this happens everywhere, the comet goes dormant and begins to resemble an asteroid.

Note that the one visited by Rosetta -- 67P/Churyumov–Gerasimenko -- is not a virgin but has gone through a number of perihelion brushes with the sun, so it's been baked a fair bit. Oh, if only the harpoon anchors had worked to dig the Philae lander onto a good vantage point! I fear that the little lander may not get enough sunlight to do much more science.  And even if it does, those gases shooting out of the mantle layer will likely blow the poor thing into space, before any of the real action starts.  At which point we'll still have the main Rosetta Orbiter...

... for which I am grateful! It's always nice to see your graduate work confirmed, At least superficially, it looks like I shoulda stayed in comet studies.  I was on a roll! Could have evaded the sci fi rat race....

== More personal news from outer space! ==

My own asteroid had its closest approach to Earth on November 18. Asteroid 5748 Davebrin passed within 1.256 AU for a summer that's actually pretty balmy and close.  So close that humanity might someday include it in efforts to access the fantastic riches out there.  May it be disassembled and turned into wonderful things! I just have two wishes. 

First, to share in the action! Hey, I got a claim.

Second? To go out there in person and kiss my...

...oh, never mind. ;-) May you ALL get your own space rocks.  

And each live for fifty more of its orbits.