Mars rover takes 3-year journey to rim of crater

NASA's Mars Exploration Rover Opportunity has reached the Endeavour crater to study clay minerals that may have formed at a warmer, wetter time.

X-class solar flare August 9. Aurora alert in coming days

The sun emitted an X6.9 or X7 flare on August 9, 2011. X-flares are the biggest flares. Some radio blackouts might occur. Aurora alert in the next few days.

Mars’ north pole at northern summer solstice

What's it like at the north pole of Mars, at the time of the northern summer solstice? Check out this image from ESA's Mars Express spacecraft.

James Webb Space Telescope in financial limbo, but science pushes on

The James Webb Space Telescope brings proven on-the-ground benefits as recently as July 2011. Plus - how you can help save this project.

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.

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.

Astronomers find 96 new star clusters hidden in Milky Way dust

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.

Juno spacecraft’s goal to reveal Jupiter’s secrets

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.

New Mars Rover Curiosity now has a landing site

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.