Phoenix, a NASA robotic probe, landed successfully on Mars on May 25. It landed in the north polar region of Mars, at around the equivalent latitude of northern Alaska, and it will study Mars’ soil to look for clues of past water patterns and if it was ever hospitable to life.
Incredibly, as it parachuted down towards the surface, its picture was taken by a satellite orbiting Mars, the Mars Reconnaissance Orbiter (MRO)! From an amazing distance of 750 kilometers (470 miles), it snapped this photograph of Phoenix parachuting towards Mars. This is the first time one probe has photographed another landing on a planet.
See full-sized version. Credit: NASA/JPL-Caltech/University of Arizona
To see how this fits in to the landing, take a look at this cool animation of Phoenix landing, produced by MAAS Digital and NASA.
Source: wisebread.com. Credit: NASA.
I came across this on wisebread.com; apparently the photographer and subject is astronaut Clay Anderson. It’s a beautiful picture—he is facing Earth and taking a photograph of himself, so the Earth is reflected in his visor. Sadly, I was unable to find this on NASA’s web site; they have a couple pictures of visor reflections but none as beautiful as this, in my opinion.
Some time ago I came across a very nicely done Flash animation showing how the universe and Earth have developed to this point:
evolution — what next?.
The site features a timeline with a slider you can drag. It starts at the big bang, an estimated 13.7 billion years ago. Once the solar system forms some five billion years ago, it focuses on Earth. Since the most interesting things, from a human perspective, have happened recently, there are a series of supplemental sliders to focus on the most recent portion of each timeline. With simple animations, it’s a nice, easy way to visualize the history of our planet, and see just where our little story fits in.
From astronomer and science humorist Eric Schulman comes this amusing, 200-word history of the universe. You may have come across it before; it has enjoyed wide popularity and has been updated from its original version. Its concision appeals to me.
Quantum fluctuation. Inflation. Expansion. Particle-antiparticle annihilation. Deuterium and helium production. Matter domination. Recombination. Blackbody radiation. Local contraction. Large-scale structure formation. Violent relaxation. Virialization. Galaxy formation. Turbulent fragmentation. Contraction. Ionization. Massive star formation. Deuterium ignition. Hydrogen fusion. Hydrogen depletion. Core contraction. Envelope expansion. Helium fusion. Carbon, oxygen, and silicon fusion. Iron production. Implosion. Supernova explosion. Metals injection. Star formation. Universal acceleration. Supernova explosions. Star formation. Planetesimal accretion. Planetary differentiation. Crust solidification. Volatile gas expulsion. Water condensation. Carbon dioxide solution. Water photodissociation. Escaping hydrogen. Ozone production. Ultraviolet absorption. Polymerization. Coacervate formation. Molecular reproduction. Protein construction. Fermentation. Photosynthetic unicellular organisms! Oxidation. Mutation. Evolution. Cell differentiation. Respiration. Sexual reproduction. Multicellular organisms. Evolutionary diversification. Fossilization. Trilobite domination. Land exploration. Comet collision. Dinosaur extinction. Mammal expansion. Homo sapiens manifestation. Language acquisition. Glaciation. Innovation. Religion. Animal domestication. Fermentation. Food surplus production. Inscription. Civilization! Exploration. Warring nations. Empire creation and destruction. Expansion. Scientific explanation. Colonization. Revolution. Constitution. Vaccination. Industrialization. Emancipation. Invention. Mass production. Urbanization. Migration. World conflagration. Suffrage extension. Penicillin. Depression. World conflagration. Fission explosions. Computerization. United Nations. Space exploration. Population explosion. Environmental degradation. Superpower confrontation. Liberation. Terrorism. Lunar excursions. Resignation. Inflation. Internet expansion. Globalization. Reunification. Dissolution. Union. World Wide Web creation. Composition. Terrorism. Invasion. Extrapolation?
Just a quick post, since I want to get up early to watch the total lunar eclipse…
I’m always pleased to see celebrities promoting science or education or pursuing higher education themselves. (I previously discussed actor Terrence Howard’s interest in obtaining a physics doctorate.) Brian May (wp), lead guitarist for the popular rock band Queen (wp), recently submitted his doctoral thesis in astrophysics. Title “Radial Velocities in the Zodiacal Dust Cloud” and 48,000 words long, it should earn him his Ph.D. in May. See SPACE.com‘s article for more.
I already thought the free Google Earth program was one of the coolest programs out there. Sort of a “digital globe”, you can zoom from looking at the entire Earth right up to your house or favorite location, change viewing angles, and fly to other places. That alone can occupy me to no end, but there is so much more you can do with the program. I think a good side benefit of Google Earth—and I’ve remarked on this before—is that to some degree, I feel it helps promote interest in geography. As one goes about exploring places, it’s difficult not to appreciate their geographical relationships, and eventually one starts exploring other parts of the world, as well.
But now Google’s taken this a step further. In their newest version, they’ve added the ability to explore the sky as well. Complete with Hubble imagery and loads of astronomical tidbits, this is a great new feature and one I hope will stimulate interest in astronomy.
Below is a video demonstration Google has created. There has also been a significant amount of media coverage—see, for instance, articles in New Scientist, SPACE.com, PC World, or other media.
I should note that the astronomical view is displayed as one might see it from Earth—sort of on the inside of a dome, not unlike a planetarium view. You cannot travel out into space. For that, I strongly recommend the excellent, free, and easy-to-use Celestia (wp). It’s beautiful, has an elegant interface, and is quite powerful. Google Earth plays a rather different role, and both programs complement each other nicely. I strongly urge everyone to download and explore both!
Update: Scientific American has a nice article, as well.
In some ways, our biologists are hampered by having only one “scheme” to study. Since all extant life on Earth descended from the same primordial unicellular organism (perhaps 3.5 billion years ago), we all share a remarkably similar biochemistry, even in details. It is difficult to imagine what other systems would be possible, and how fundamentally different they might be. This also means that as we search space for signs of extraterrestrial intelligence, we tend to concentrate on organisms like us. For the most part, we assume that they, too, will be carbon-based, and use water as a solvent for organic chemistry. Silicon and ammonia have been proposed as alternatives, though the available chemistry doesn’t appear as rich. (See Wikipedia’s article on alternative biochemistry for more information.) Then, too, organisms with this alternative biochemistry still would be rather similar to Earth-based life. What other possibilities could there be? Scientists and science-fiction writers have tackled this question for generations.
Scientists in Germany speculate about life in spirals of dust in outer space. Electrically charged dust immersed in plasma (ionized gas) can produce crystals and spirals. According to a New Scientist article, a simulation suggests double-helices could form as well. In addition, two stable states suggests that information could be “encoded” in these structures. If these structures exist, are stable, and can replicate (perhaps by inducing the surround dust to adopt the same pattern), a self-replicating system that could give rise to life would exist—indeed, many would argue that such a self-replicating system were alive. The researchers speculate that the rings of Saturn or Uranus might be regions to find such spirals.
Of course, this is all hypothetical, but I find it fascinating, nonetheless.