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Cassini’s legacy will endure. Click for a video about the atmosphere of Saturn’s large moon Titan, which might resemble that of an early Earth.

X-ray astronomers explored how quickly young stars settle down after blasting the space around themselves – including any possible planets – with energetic radiation.

Hold out your hand for 10 seconds. A dozen electrons and muons just zipped through your palm. These cosmic rays, scientists believe, come from violent explosions in deep space.

Even as the long-lived Cassini spacecraft gears up for its last moments at Saturn, it’s preparing for a final long-distance look at Titan, Saturn’s large moon, on September 11.

NASA says to blame the sun for its moratorium on sending commands to Mars from July 22 to August 1.

New video shows 6 hypervelocity stars, zipping from Milky Way center to outskirts. An interaction with our galaxy’s central, supermassive black hole might have kicked them into fast motion.

Low ebb in the 11-year sunspot cycle expected 2019-2020. Want some basic information about the sunspot cycle and its effects? Watch this NASA ScienceCast.