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.

NASA is delaying the launch of the James Webb Space Telescope for another 7 months, from March 2021 to October 31, 2021, due to, among other factors, work stoppages during the coronavirus pandemic.

Scientists in Australia have discovered a strange new phenomenon in deep space - "Odd Radio Circles" - that appear in radio telescope images as mysterious circles or rings.

The book called "The Jupiter Effect" suggested an alignment of planets in 1982 would cause earthly catastrophes, including a great earthquake on California's San Andreas Fault. There's another planetary alignment, of sorts, going on now. Will it cause volcanic eruptions? Charts, and info, from Guy Ottewell.