Atom & Cosmos

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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.  

infrared image of Jupiter

Jupiter glows with infrared light in this recent false-color image from the Very Large Telescope in Chile.

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. 

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