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The Mars rover InSight will not launch as scheduled in March. A seismometer it was supposed to carry has experienced a series of vacuum leaks and cannot be repaired in time. Yang Lei/Xinhua/Landov hide caption

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Yang Lei/Xinhua/Landov

The new object is one of many dwarf planets orbiting at the edge of the solar system. This artist's conception shows the previous record-holder for distance, a dwarf planet called Eris. ESO/L. Calçada hide caption

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ESO/L. Calçada

Astronomers Spot Most Distant Object So Far In The Solar System

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The grooves on Mars' moon Phobos could be produced by tidal forces – the mutual gravitational pull of the planet and the moon, says NASA. The theory is the latest explanation for grooves that were once thought to result from the massive impact that caused the Stickney crater (lower right). NASA/JPL-Caltech/University of Arizona hide caption

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NASA/JPL-Caltech/University of Arizona

Matt Damon portrays an astronaut who relies on science to survive on a hostile planet. Giles Keyte/EPKTV hide caption

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Giles Keyte/EPKTV

How 'The Martian' Became A Science Love Story

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