Explanation: They might look like trees on Mars, but they’re not. Groups of dark brown streaks have been photographed by the Mars Reconnaissance Orbiter on melting pinkish sand dunes covered with light frost. The above image was taken in 2008 April near the North Pole of Mars.
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Explanation: Not a bright comet, 67P/Churyumov-Gerasimenko now sweeps slowly through planet Earth’s predawn skies near the line-up of planets along the ecliptic.
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Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
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Explanation: Planet Earth’s horizon stretches across this recent Solar System group portrait, seen from the southern hemisphere’s Las Campanas Observatory. Taken before dawn it traces the ecliptic with a line-up familiar to November’s early morning risers.
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Explanation: Why are there unusual pits on Pluto? The indentations were discovered during the New Horizons spacecraft’s flyby of the dwarf planet in July.
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LeAnne Hitt 