Galactic cosmic rays are high energy particles from explosive events like supernovae, zinging through our solar system, constantly bombarding both Earth and Mars. A researcher suggests they supply enough energy to make subsurface life on Mars possible.

The European Space Agency's Trace Gas Orbiter has unexpectedly detected carbon dioxide and ozone in Mars' atmosphere where the elusive methane should be, researchers in the UK and Russia have announced. The two gases may be hindering the probe's methane detections.

The SpaceX Crew Dragon splashdown into the Gulf of Mexico today was the first splashdown in 45 years.

A mysteriously long, thin cloud has again appeared over the Arsia Mons volcano on Mars.

These are the first spacecraft images yet acquired of the north pole of Ganymede, largest moon of the giant planet Jupiter. NASA's Juno spacecraft - now orbiting Jupiter - obtained them.

It was a picture-perfect launch this morning for the Mars 2020 Perseverance rover, with good weather and no major hitches. The rover lifted off on a United Launch Alliance Atlas V rocket from Cape Canaveral Air Force Station in Florida.

And why this rediscovery of a lost world - called NGTS-11b - bodes well for finding habitable exoplanets.

The Mt. Lemmon survey discovered the asteroid on July 26. It was labeled near-Earth asteroid 2020 OY4. The asteroid then passed at about 11% of the moon's distance early in the day on July 28. The Virtual Telescope Project in Rome captured its image.

A few observers in the Southern Hemisphere are beginning to capture Comet NEOWISE, too. Charts here for seeing the comet in late July and early August.

For the 1st time ever, astronomers have photographed more than one giant exoplanet orbiting a sunlike star. The planetary system is similar to our solar system, but younger.