Water on Mars any point in the year but would be ideal for solid carbon dioxide. The carbon dioxide melting in the warmer summer would yield liquid carbon dioxide which would then form the gullies. Even if gullies are carved by flowing water at the surface, the exact source of the water and the mechanisms behind its motion are not understood. The dry gullies are deep grooves etched into the slopes that are there year-round. There are many other features on Mars, and some of them change seasonally. In August 2011, NASA announced the discovery by undergraduate student Lujendra Ojha of current seasonal
Exploration of Mars from after being released and was declared lost in February 2004. "Beagle 2" was located in January 2015 by HiRise camera on NASA's "Mars Reconnaissance Orbiter" (MRO) having landed safely but failed to fully deploy its solar panels and antenna. In early 2004, the "Mars Express" Planetary Fourier Spectrometer team announced the orbiter had detected methane in the Martian atmosphere, a potential biosignature. ESA announced in June 2006 the discovery of aurorae on Mars by the "Mars Express". In January 2004, the NASA twin Mars Exploration Rovers named "Spirit" (MER-A) and "Opportunity" (MER-B) landed on the surface of Mars. Both