Astronomers found a snail-shaped substructure of stars in our larger Milky Way galaxy. It indicates the Milky Way is still enduring the effects of a near-collision that set millions of stars moving like ripples on a pond.
Penitentes – large pointed spikes of ice – are known on Earth and Pluto. Jupiter’s moon Europa might have them, too, according to new research. If they’re there, they could make a future landing on Europa tricky.
The BepiColombo mission to our sun’s innermost planet – fascinating little Mercury – launches from Europe’s spaceport in French Guiana on October 20 at 01:45 UTC (tonight at 9:45 p.m. EDT). Here’s how to watch.
Voyager 2, launched in 1977, is now about 11 billion miles (17.7 billion km) from Earth. NASA says the spacecraft has detected an increase in cosmic rays, which might mean it’s close to becoming only the 2nd human-made object, after Voyager 1, to enter interstellar space.
The Hubble Space Telescope has been in safe mode since last Friday evening, following the failure of one of the gyros that helps stabilize it. NASA is analyzing the problem and hopes to resume operations soon.