ScienceDaily: Stars News |
| Modified law of gravity predicts dwarf galaxy feature prior to observations Posted: 28 Aug 2013 07:34 AM PDT MOND, a modified law of gravity, correctly predicted in advance of observations the velocity dispersion -- the average speed of stars within a galaxy relative to each other -- in 10 dwarf satellite galaxies of the Milky Way's giant neighbor Andromeda. MOND also detected subtle differences in gravity fields that dark matter theory says should be uniform. |
| Oldest solar twin identified: New clues to help solve lithium mystery Posted: 28 Aug 2013 07:33 AM PDT Astronomers have used ESO's Very Large Telescope to study the oldest solar twin known to date. Located 250 light-years away, the star HIP 102152 is more like the Sun than any other solar twin — except that it is nearly four billion years older. This older twin may be host to rocky planets and gives us an unprecedented chance to see how the Sun will look when it ages. |
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