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The NASA rover Curiosity has beamed back pictures of bedrock that suggest a fast-moving stream, possibly waist-deep, once flowed on Mars -- a find that the mission's chief scientist called exciting.

NASA's Curiosity rover reached out and touched a Martian rock with its huge robotic arm for the first time, then took off on its longest Red Planet drive to date. Curiosity spent the past several days investigating a strange pyramid-shaped stone named "Jake Matijevic," testing out some of the gear at the end of its 7-foot-long (2.1-meter-long) arm. These tools include the Alpha Particle X-Ray Spectrometer, or APXS, which measures elemental composition; and the Mars Hand Lens Imager close-up camera, or MAHLI.

Getting a six-wheeled car-size rover safely onto the surface of the red planet? Daunting, sure. But NASA did it with Curiosity. Sending humans on a mission to Mars? That requires overcoming even more outlandish obstacles.

David's time on Earth had come to a temporary end — and he was taking his family with him. As soon as the rover Curiosity dropped onto the Martian surface on Aug. 5, David and hundreds of his fellow scientists and engineers at NASA's Jet Propulsion Laboratory switched from Earth time to Mars time.

NASA's Curiosity rover is making global headlines as it travels uncharted territory on Mars, and it will venture into new realms back on Earth this week when it premieres a new will.i.am song. The Black Eyed Peas rapper's tune "Reach For The Stars" will be broadcast live from the surface of Mars, via Curiosity, at 1 p.m. PST (4 p.m. EDT/2000 GMT) on Tuesday to a news conference at NASA's Jet Propulsion Laboratory in Pasadena, California, the organization said in a statement on Monday.

The mission team also unveiled today a stunning 360-degree panorama of Curiosity's Gale Crater landing site, showing in crisp detail some of the landforms scientists want the six-wheeled robot to explore.

NASA's Curiosity rover on Wednesday left its first tracks on Mars, successfully completing a short test drive that showed it was ready to roll on longer treks for science investigations over the next two years.

Curiosity phoned home throughout its daring and unprecedented landing sequence that night, giving its nervous handlers step-by-step status and health updates. The European Space Agency's Mars Express orbiter recorded some of this chatter, and now we can hear what Curiosity had to say.

Many skywatchers go through their entire lives without ever seeing the elusive planet of Mercury. Thursday morning, Aug. 16, is one of the rare opportunities when you can catch a glimpse of  it.

India plans to launch a space probe that will orbit Mars, Prime Minister Manmohan Singh confirmed on Wednesday after press reports that the mission was scheduled to begin late next year. The project would mark another step in the country's ambitious space programme, which placed a probe on the moon three years ago and envisages its first manned mission in 2016.