Mysterious Objects at the Edge of the Electromagnetic Spectrum - NASA Science - Iceweasel. Mysterious Objects at the Edge of the Electromagnetic Spectrum March 16, 2012: The human eye is crucial to astronomy.
Without the ability to see, the luminous universe of stars, planets and galaxies would be closed to us, unknown forever. Nevertheless, astronomers cannot shake their fascination with the invisible. Outside the realm of human vision is an entire electromagnetic spectrum of wonders. Each type of light--from radio waves to gamma-rays--reveals something unique about the universe. NASA has many telescopes "working the wavelengths" up and down the electromagnetic spectrum. "Fermi is picking up crazy-energetic photons," says Dave Thompson, an astrophysicist at NASA's Goddard Space Flight Center. “This is what the sky looks like near the very edge of the electromagnetic spectrum, between 10 billion and 100 billion electron volts.” The light we see with human eyes consists of photons with energies in the range 2 to 3 electron volts. What lies within this new realm?
Kepler Discovers Earth-size Exoplanets - NASA Science - Iceweasel. Kepler Discovers Earth-size Exoplanets Dec 20, 2011: NASA's Kepler mission has discovered the first Earth-size planets orbiting a sun-like star outside our solar system.
The planets, called Kepler-20e and Kepler-20f, are too close to their star to be in the so-called habitable zone where liquid water could exist on a planet's surface, but they are the smallest exoplanets ever confirmed around a star like our sun. The discovery marks the next important milestone in the ultimate search for planets like Earth. The new planets are thought to be rocky.
Kepler-20e is slightly smaller than Venus, measuring 0.87 times the radius of Earth. Kepler-20e orbits its parent star every 6.1 days and Kepler-20f every 19.6 days. “The primary goal of the Kepler mission is to find Earth-sized planets in the habitable zone," said Francois Fressin of the Harvard-Smithsonian Center for Astrophysics in Cambridge, Mass., lead author of a new study published in the journal Nature. Production Editor: Dr. 600 Mysteries in the Night Sky - NASA Science - Iceweasel. 600 Mysteries in the Night Sky Oct 18, 2011: NASA's Fermi team recently released the second catalog of gamma-ray sources detected by their satellite's Large Area Telescope (LAT).
Of the 1873 sources found, nearly 600 are complete mysteries. No one knows what they are. "Fermi sees gamma rays coming from directions in the sky where there are no obvious objects likely to produce gamma rays," says David Thompson, Fermi Deputy Project Scientist from Goddard Space Flight Center. Gamma rays are by their very nature heralds of great energy and violence. For two thirds of the new catalog's sources the Fermi scientists can, with at least reasonable certainty, locate a known gamma ray-producing object*, such as a pulsar or blazar, in the vicinity the gamma-rays are coming from.
"Some of the mystery sources could be clouds of dark matter – something that's never been seen before," speculates Thompson. S Spitzer Detects Comet Storm in Nearby Solar System - NASA Jet Propulsion Laboratory - Iceweasel. Telescopes Help Solve Ancient Supernova Mystery - NASA Jet Propulsion Laboratory - Iceweasel. Herschel Finds Oceans of Water in Disk of Nearby Star - NASA Jet Propulsion Laboratory - Iceweasel. Airborne Radar Set to Image Hawaiian Volcano - NASA Jet Propulsion Laboratory - Iceweasel. Wide-Field Infrared Survey Explorer - Iceweasel. Telescope Ferrets Out Planet-Hunting Targets - NASA Jet Propulsion Laboratory - Iceweasel. Announces Results of Epic Space-Time Experiment - NASA Science - Iceweasel.
NASA Announces Results of Epic Space-Time Experiment May 4, 2011: Einstein was right again.
There is a space-time vortex around Earth, and its shape precisely matches the predictions of Einstein's theory of gravity. Researchers confirmed these points at a press conference today at NASA headquarters where they announced the long-awaited results of Gravity Probe B (GP-B). "The space-time around Earth appears to be distorted just as general relativity predicts," says Stanford University physicist Francis Everitt, principal investigator of the Gravity Probe B mission.
"This is an epic result," adds Clifford Will of Washington University in St. Time and space, according to Einstein's theories of relativity, are woven together, forming a four-dimensional fabric called "space-time. " If Earth were stationary, that would be the end of the story. The idea behind the experiment is simple: In practice, the experiment is tremendously difficult. Pulling off the experiment was an exceptional challenge.
Free-Floating Planets May be More Common Than Stars - NASA Jet Propulsion Laboratory - Iceweasel. Space Images.
Near Earth Objects. Planets. Earth-sensing. Galaxies. Space Science. Black hole. Spitzer Sees Crystal 'Rain' in Outer Clouds of Infant Star - NASA Jet Propulsion Laboratory - Iceweasel. Astroids & comets. Sun. Zooniverse - Real Science Online - Iceweasel.