Aurora alert! The combined effects of two solar flares will reach Earth around 23 UTC on August 4. That is 7 p.m. EDT tonight. No major problems expected.
Thousands of dark, finger-like features extend down slopes during late spring and summer on Mars. Alfred McEwen said it might be salty water flowing today.
Astronomers found 96 new star clusters in our Milky Way - the first time so many have been found at once. Each spans light-years and contains 10-20 stars.
On August 5, 2011, NASA launched the Juno spacecraft on a $1.1 billion mission to Jupiter. The craft will orbit for a year and sweep near Jupiter's cloudtops.
Curiosity has more than twice the length and and five times the weight of previous Mars rovers. It's scheduled to launch in 2011 and arrive in August 2012.
Researchers at the University of Maryland just tried to simulate the the Big Crunch - the end of the universe. Who knew all you needed was gold and plastic?