Gravitational waves leave a detectable mark, physicists say

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New research shows that gravitational waves leave behind plenty of 'memories' that could help detect them even after they've passed.
via Science Daily
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Gravitational forces in protoplanetary disks may push super-Earths close to their stars

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Astronomers found that as planets form out of the chaotic churn of gravitational, hydrodynamic -- or, drag -- and magnetic forces and collisions within the dusty, gaseous protoplanetary disk that surrounds a star as a planetary system starts to form, the orbits of these planets eventually get in synch, causing them to slide -- follow the leader-style -- toward the star.
via Science Daily
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New clues about how ancient galaxies lit up the Universe

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NASA's Spitzer Space Telescope has revealed that some of the Universe's earliest galaxies were brighter than expected. The excess light is a by-product of the galaxies releasing incredibly high amounts of ionizing radiation. The finding offers clues to the cause of the Epoch of Reionization, a major cosmic event that transformed the universe from being mostly opaque to the brilliant starscape seen today.
via Science Daily
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