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Since the discovery of planetary nebulae in the late 1700s, astronomers have learned that these expanding shells of glowing gas expelled by low-intermediate mass stars late in their lives can

Ice crystals in Earth’s atmosphere sometimes align just right to create various striking visual effects, from a halo around the moon, to bright spots called sundogs on either side of

I’m not exaggerating when I say that our studies of the moon have unlocked the mysteries of the universe.

Outdoor lighting for buildings, roads and advertising can help people see in the dark of night, but many astronomers are growing increasingly concerned that these lights could be blinding us

Scientists have been able to recreate the extreme conditions found on icy moons in deep space—and revealed the unstable behavior of water.

An international team of astronomers reports the discovery of a new long-period radio transient, which received the designation ASKAP J144834−685644 (ASKAP J1448−6856 for short). The newfound transient is a crucial

Looking up at the night sky, it may seem our cosmic neighborhood is packed full of planets, stars and galaxies. But scientists have long suggested there may be far fewer

The swirling spiral galaxy in this NASA/ESA Hubble Space Telescope image is NGC 3285B, which resides 137 million light-years away in the constellation Hydra (the Water Snake). Hydra has the

In 2015, astronomer Tabetha Boyajian and colleagues announced the discovery of unusual light fluctuations coming from a star about 1,500 light-years away. It came to be known as “Tabby’s star”

The US space agency NASA will lose about 3,900 employees under Donald Trump’s sweeping effort to trim the federal workforce—at the same time as the president prioritizes plans for crewed