Astronomy

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asteroid 1999 JD6

Radar mapping revealed two lobes of a 2-kilometer-long asteroid (designated 1999 JD6) when it buzzed Earth on July 25, 2015. Asteroid Day on June 30 raises awareness of run-ins with such rocks.  

satellite galaxies

VIRTUAL GALAXY  New simulations show that supernovas whittle away at the sea of dark matter surrounding our galaxy (left), leaving only a few blobs that are massive enough (circled) to create satellite galaxies. The image on the right, from the same simulation, shows where stars end up forming. 

two black holes merging

DUOS’ DANCE   Mergers of two pairs of black holes (illustrated) showcase ability of gravitational waves as a new tool for understanding the universe. LIGO detected gravitational waves from both mergers shown, but at different times and in different parts of the sky. 

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