The new images by the Curiosity rover on Mars show "dramatic evidence" of ancient groundwater in crisscrossing low ridges, ...

To witness this astronomical anomaly, look for Mars in the eastern sky after 10 p.m., which is when the planet rises above the horizon, according to EarthSky.org.Under clear, dark skies, the ...

Mars' opposition occurs about every two years and coincides with the planet's retrograde motion, which began on Dec. 7 and will end Feb. 23. Retrograde occurs when a planet appears to be moving ...