ikenbot:
8 Modern Astronomy Mysteries Scientists Still Can’t Explain
Image: This artist’s impression shows galaxies at a time less than a billion years after the Big Bang, when the universe was still partially filled with hydrogen fog that absorbed ultraviolet light. Credit: ESO/M. Kornmesser
The vastness of space and the puzzling nature of the cosmic objects that occupy it provides no shortage of material for astronomers to ponder.
To round up some of the most enduring mysteries in the field of astronomy, the journal Science enlisted help from science writers and members of the Board of Reviewing Editors to choose eight puzzling questions being asked by leading astronomers today.
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n-a-s-a:
Volcanic Terrain on Mercury
Credit: MESSENGER, NASA, JHU APL, CIW
the-star-stuff:
The galaxy we live in, the Milky Way, is a large spiral galaxy that lives in a small cluster of other galaxies called the Local Group. The other big member is the Andromeda galaxy, located about 2.5 million light years away. That’s a long way off, but we’ve known for a long time that Andromeda is heading more or less toward us at a speed of roughly 100 km/sec (60 miles/second).
The question is, is it headed directly at us, or does it have some “sideways” motion and will miss us?New results announced today by astronomers using Hubble show that — gulp! — Andromeda is headed right down our throats!
But don’t panic. It won’t happen for nearly 4 billion years.
Watch the video here.
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