In a breakthrough study, astronomers pinpointed the location in the sky of a fast radio burst. That let them determine its home galaxy, and improve their theories about its cause.
Snap a pic, and the (free) Merlin Bird Photo ID app will identify the bird. Once downloaded, it can go anywhere bird-watchers go, even places without cell service or Wi-Fi.
The hole is gigantic and facing Earth's way. Possible aurora sightings at the latitude of the northern U.S. – for example, in Michigan or Maine – on January 4 and 5.
As 2017 opens, the young moon is sweeping past dazzling Venus in the west after sunset. Mars is there, too, and, for those with optical aid, Neptune! Photos here.
We list the 13 lunar perigees (close moons) and 13 lunar apogees (far moons) for the year 2017, plus share a secret on the intriguing cycle of close and far moons.
Elusive anticrepuscular rays converge towards a point on the sky opposite the sun. Karl Diefenderfer caught them as 2016 came to a close, as a flock of geese was passing by.
The dazzling “star” near the waxing moon on January 1, 2 and 3, 2017 is Venus. Mars is also along a line between the sunset location on your horizon and the moon and Venus in your sky.