For the first time, evidence from the rover Opportunity last week showed minerals that require persistent liquid water to form.

This month, the rover Opportunity photographed the smaller Martian moon, Deimos, as it passed in front of the Sun.

The rover Opportunity landed in a particularly interesting spot, a crater with bedrock outcroppings.

After two weeks of investigation, mission engineers are able to command the arm of the rover Opportunity on Mars to make a slight movement.

The same flaw affects the Spirit's twin, the rover Opportunity, which landed early on Sunday morning on the opposite side of Mars.

On the other side of the planet, the rover Opportunity completed its examination of soil next to its landing site and rolled 10 feet to a new location.

Scientists cannot tell from the photographs alone which explanation is more likely, but other instruments aboard the rover Opportunity should offer more conclusive evidence.

The rover Opportunity marked its 90th Martian day on Monday.

Two weeks after the rover Opportunity landed on Mars, NASA finally knows where it is.

It was visited by the rover Opportunity (MER-B) on Sol 84, April 24, 2004.

For the first time, evidence from the rover Opportunity last week showed minerals that require persistent liquid water to form.

This month, the rover Opportunity photographed the smaller Martian moon, Deimos, as it passed in front of the Sun.

The rover Opportunity landed in a particularly interesting spot, a crater with bedrock outcroppings.

After two weeks of investigation, mission engineers are able to command the arm of the rover Opportunity on Mars to make a slight movement.

The same flaw affects the Spirit's twin, the rover Opportunity, which landed early on Sunday morning on the opposite side of Mars.

On the other side of the planet, the rover Opportunity completed its examination of soil next to its landing site and rolled 10 feet to a new location.

Scientists cannot tell from the photographs alone which explanation is more likely, but other instruments aboard the rover Opportunity should offer more conclusive evidence.

The rover Opportunity marked its 90th Martian day on Monday.

Two weeks after the rover Opportunity landed on Mars, NASA finally knows where it is.

It was visited by the rover Opportunity (MER-B) on Sol 84, April 24, 2004.