LPI Earth and Space Science Newsletter
Milky Way Part of Newly Identified Supercluster
Astronomers have determined that our Milky Way galaxy is part of a massive supercluster of galaxies. The Milky Way is in the outskirts of this Laniakea Supercluster, which is 500 million light years wide and contains 100,000 galaxies.
How Did Supermassive Black Holes Form Quickly?
Astronomers have evidence that supermassive black holes (a billion times the mass of the Sun) formed at the centers of many galaxies early in Universe. One puzzle has been how they could form quickly, when the accretion disk around a black hole would make it difficult for it to grow very fast. A new model suggests that they may have formed in clusters of thousands of stars, whose gravitational pull prevented the accretion disk from forming.
New Information about Rosetta Comet
The European Space Agency's Rosetta spacecraft is examining Comet 67P and has discovered it has a dark, dusty crust. Rosetta will approach and orbit the comet, mapping the surface temperature to understand its structure and composition. It will eventually land on the comet.
Astronomers Discovery Mystery Matter
Astronomers examining the spectra of superheated gases in the Perseid Galaxy Cluster have found a spectral line that does not correspond to any known type of matter. One possibility is that it may correspond to dark matter.
Comet's Path Narrowly Misses Mars
On Oct. 19, 2014, Comet Siding Spring (C/2013 A1) will pass extremely close to Mars. Siding Spring will glide by Mars only 132,000 km away--about 1/3rd of the distance between Earth and the Moon. Although the comet's nucleus will not strike the planet, gas and dust spewing out of the comet's core will likely interact with the Martian atmosphere. There could be a meteor shower, auroras, and other effects that no one can predict. NASA's fleet of Mars spacecraft and rovers will record whatever happens.