Theresa Wiegert
Large radio telescope dish with five towers around it, surrounded by forest.

China’s huge FAST telescope to open to international observers

FAST’s 500-meter (1,640-foot) dish makes it the world’s largest single-dish radio observatory. It’s expected to open to international observers in 2021.

Oddly shaped near-horizon suns and moons

The light rays from the sun or the moon travel through more atmosphere near the horizon, which can cause the image you see to be distorted in imaginative ways.

Earth's night sky above a ridgeline, with a huge purple halo around the Andromeda galaxy.

Milky Way and Andromeda galaxies are already merging

Billions of years from now, Earth’s night sky will change as the Andromeda galaxy rushes toward a merger with the Milky Way.