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.
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.
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
Fifty-one Perseid meteors were captured in this composite image of 30-second exposures taken over six hours in 2004. The annual Perseid meteor shower is one of the most visible to the human eye.