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.
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.
Expect 7 billion humans by October 31, according to experts at the Population Reference Bureau, which released its 2011 World Population Data Sheet on July 27.
Mysterious volcanic domes - rich in silica - have been found on the far side of the moon. Their origin remains enigmatic. Read more about mystery moon domes.
In his years with EarthSky, Jorge Salazar conducted thousands of in-depth interviews with scientists. He knows a lot about as diverse as nanotechnology, ecosystem-based management, climate change, global health, international environmental treaties, astrophysics and cosmology, and environmental security. Jorge currently works as a Technical Writer/Editor for the Texas Advanced Computing Center, which designs and deploys powerful advanced computing technologies and innovative software solutions for scientific researchers.