The four-planet lineup that began in January will conclude by mid-to-late February, as Saturn sinks increasingly lower in the sky each night after sunset, according to NASA. While Mercury will ...

underground rock layers that testify to an ancient northern ocean with gently lapping waves, as detailed in a study published January 14 in the journal PNAS. Their work bolsters previous research ...

The study applied methods developed to explore Earth's atmosphere to quantitatively estimate the influence of gravity waves on Mars' planetary circulation. Despite it being a very cold planet ...