Hidden within the subtle hues of the stars are the keys to their temperatures and compositions. Get acquainted with the classic OBAFGKM spectral sequence through real stars you can see on a spring night.
Two amateur videos shot early on March 17th show a brief but bright flash on the edge of Jupiter's disk. Did the King of Planets get whacked again?
Astronomers have measured the spin of one of the universe's most massive black holes — and provided evidence that the behemoth has a companion.
Ground controllers are scrambling to recover the Hitomi satellite from a mysterious 'debris anomaly' over the past weekend.
Observations by NASA's New Horizons spacecraft, combined with new modeling of long-term trends, suggest that Pluto's atmosphere is far more dynamic than anyone imagined.
Astronomers studying the infrared glow that pervades the universe have pinned down its source: dusty, faint, and faraway galaxies.
Splintered comet duo 252P/LINEAR and P/2016 BA14 liven up both dusk and dawn this week. Naked-eye 252P finally debuts in northern skies, while BA14 makes a beeline through the Big Dipper.
By tracking deviations in spacecraft orbits, planetary scientists have created a high-resolution map of the Red Planet's gravitational pull.
Astronomers have identified 53 “super spirals” — spiral galaxies that are huge and incredibly luminous — as part of a project exploring archived observations.
Not one, but two, possibly related comets will make exceptionally close flybys of Earth on March 21–22. Here's what we know and a guide on how to see them.
The launch of ESA's ExoMars Trace Gas Orbiter and Schiaparelli lander heralds a new phase of Mars exploration.
The motions of thirteen stars in our galaxy’s halo outline a shell-like structure, perhaps the remains of an ancient galactic collision.
Skygazers thronged to Indonesia hoping to see a total solar eclipse — and most were rewarded with breathtaking views of the event.
On the morning of Wednesday, March 9th, 240 members of a Sky & Telescope cruise were treated to a spectacular total solar eclipse.
A burst pipe flooded Harvard College’s Observatory Hill, submerging thousands of historic photographic plates underwater. Recovery is now under way.
An innovative CubeSat mission, slated to take to space this year, will demonstrate the feasibility of free-flying satellites.
Professional and amateur astronomers working together have found a young exoplanet in the Hyades star cluster. The planet is weirdly large, given its host star.
It's high time that we amateur astronomers got serious about protecting the night sky from light pollution.
On March 9th — late on Tuesday, March 8th, in the U.S. — the Moon will completely cover the Sun. Check here for the links you'll need to see this celestial spectacle as it happens.
Astronomers using the Hubble Space Telescope have measured a precise distance to a galaxy dwelling in the cosmic dawn.
A brief burst of radio waves has been observed repeating, enabling astronomers to settle its exotic origin.
A stunning submillimeter mosaic of the Milky Way Galaxy captures a portrait of the cold dust and gas swirling along the galactic plane.
After months of excitement in the predawn sky, the action is shifting to the evening — where Jupiter rises early and the stars of Orion anchor an array of celestial sights.
On March 9th, a total solar eclipse will cross parts of Sumatra, Borneo, Sulawesi, and the Pacific. Use our map to find out what you'll see at any location.
New observations from the Hubble Space Telescope are helping characterize the atmospheres of exotic planets such as 55 Cancri e.