More heat extremes across the United States in 2011

It's been hot. And it's still hot. Read more about heat extremes across the Unites States in 2011, including Tropical Storm Emily.

Krakatoa target of Earth Observing-1 satellite

The Earth Observing-1 satellite passes over Anak Krakatau - Krakatoa - and snaps a revealing shot of the growing volcano. Read more.

Gerry Bell: Expect active Atlantic hurricane season in 2011

This week, NOAA updated its outlook for 2011 Atlantic hurricanes. The new outlook anticipates even more hurricanes. Read more from Gerry Bell.

African crested rat picks its poison

Scientists discover how a harmless-looking rodent turns its own fur into a biological weapon.

Sun packs double punch: Solar flare effects to reach Earth tonight

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.

Alfred McEwen: Possibility of flowing salty water on Mars

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.

Desalination: Reasons for and against

Water expert Heather Cooley spoke with EarthSky about promises and problems of desalination in California.

LEGO figurines going to Jupiter with Juno spacecraft

NASA’s Jupiter-bound Juno spacecraft will carry LEGO likenesses of Galileo Galilei, the Roman god Jupiter, and his wife Juno to Jupiter.

In urban fox families, mother knows best

Mothers wear the trousers in urban fox families: They decide which cubs get to stay in the group and which ones have to leave, and dads have no say in the matter, a recent study has found.

Humanity winning on global challenges, yet world is unstable

The 2011 State of the Future Report says the world is in a race between an improving human condition - and bigger and more complex global problems.