Global dust storm on Mars
Image: NASA/James Bell (Cornell University)/Michael Wolff (Space Science Institute)/the Hubble Heritage Team (STSCI/AURA)
These Hubble Space Telescope images reveal how global dust storms in the atmosphere of Mars can hide features on the planet's surface. The image at left shows the planet months before the storm engulfed it. More than two months later, the storm has covered the entire planet. Seasonal global dust storms on Mars have been observed from telescopes for over a century, but this is the biggest storm seen in the past several decades.