Two days before it plunged into Saturn’s atmosphere last September 15, the Cassini spacecraft returned this final, full mosaic image of the planet.
The dark streaks on Mars known as recurring slope lineae are likely the result of repeated avalanches of sand and dust, rather than seeping water, new research shows.
This inner slope of a crater on southern Mars has several of the seasonal dark streaks called "recurrent slope lineae," or RSL, that a November 2017 report interprets as granular flows, rather than darkening due to flowing water. Read more about this image.
Will our survival strategy for monarchs work? Initiatives emphasize milkweed plantings along roadsides. New research shows egg-laying monarchs much prefer off-road farmlands.
Monarch butterfly on a milkweed flower. Image courtesy of Ryan Norris, University of Guelph.
It was a beautiful day for natural phenomena in the sky, and on the ground.
It swept nearest the sun in September, then sped away again, back to interstellar space. Astronomers named it `Oumuamua. It’s dark red, very elongated and unlike anything in our solar system.
This artist’s impression shows the first interstellar asteroid, `Oumuamua. Observations from ESO’s Very Large Telescope in Chile and other observatories around the world show that this unique object was travelling through space for millions of years before its chance encounter with our star system. It seems to be a dark red highly-elongated metallic or rocky object, about 400 metres long, and is unlike anything normally found in the Solar System. Image via ESO/ M. Kornmesser.
Learn why the Hubble Space Telescope is named for this astronomer.
Many photos of Sunday evening’s extremely thin and lovely young moon. A few glimpsed it near Mercury and Saturn, too. Watch for the waxing crescent in the evenings ahead.
A scientist launches a hunt for earthly extraterrestrials. Help her find them!
Venezuela’s last glacier is about to disappear, making it the first country in modern history to lose all of its glaciers.