NASA’s NuSTAR mission has detected an unexpected haze of high-energy X-rays in our galaxy’s center, perhaps the signal of a mass stellar graveyard.
The three brightest planets — Venus, Jupiter, and Saturn — grace our evening skies this month. Elusive Mercury makes a brief appearance too!
After four years at Mercury, NASA's Messenger orbiter has finished its remarkable mission and crashed into the planet.
Here's your chance to name an exoplanet, in a process recognized and officiated by the International Astronomical Union. Register your astronomy club or organization by June 1st!
Clashes over building the premier telescope in the Northern Hemisphere and preserving Mauna Kea as a sacred site have intensified.
New evidence suggests that nanoflares, small but potent bursts of energy, might heat the Sun’s atmosphere. But not everybody’s convinced.
It's been 25 years since the Space Shuttle Discovery lofted the Hubble Space Telescope into orbit. Yet astronomers were not unanimous in their enthusiasm for the project, as this debate from 1990 recalls.
Astronomers have discovered 195 compact elliptical galaxies, upping the known number of these weird galaxies sixfold.
April 25th is Spring Astronomy Day, when hundreds of organizations worldwide host special family-oriented events to showcase the wonder and excitement of the night sky.
A galaxy-size blob of gas discovered eight years ago by a Dutch schoolteacher has galvanized the study of the spectral remains of once-bright quasars.
Although typically weak, the annual Lyrid display will benefit from moonless skies. This year's peak, late on April 22nd, favors Europe over North America.
The Northeast Astronomy Forum (NEAF) is the world's largest astronomy trade show. As always, Sky & Telescope was there!
After serving as caretakers of Canada's largest telescope for years, volunteers from the RASC's Toronto club have been given the historic facility outright.
Astronomers have found massive galaxies 3 billion years after the Big Bang that are dying from the inside out.
This weekend features the world's largest astronomy expo, the Northeast Astronomy Forum (NEAF), in Suffern, New York.
Thanks to NASA’s Dawn spacecraft, we’re finally seeing more of the asteroid Ceres than a fuzzy ball.
A rare type of gravitational lens offers astronomers a close look at a young, dusty galaxy manufacturing hundreds of stars a year.
A 6th-magnitude nova erupted inside the Sagittarius Teapot and reached 4th magnitude. Now it has started fading.
Amateur skygazers can satisfy their celestial cravings with Globe at Night, International Dark-Sky Week, Astronomy Day, and Global Astronomy Month.
Amateur astronomy has lost a true pioneer, a keen observer who founded the worldwide Association of Lunar and Planetary Observers.
A team of astronomers compared two images taken 18 years apart to catch the dramatic evolution of a forming star and its surroundings.
In a borderline eclipse of the Moon like last Saturday's, the difference between "total" and "partial" depends on some crucial assumptions.
Most sources say April 4th's lunar eclipse will be total, though only barely so. However, those calculations have overlooked a subtle factor that might render the event only "partial."
In the first of a series of installments written exclusively for Sky & Telescope, New Horizons principal investigator Alan Stern offers his behind-the-scenes perspective on what it took to get the spacecraft to Pluto.
An unusually brief total eclipse of the Moon will be visible before dawn this Saturday, April 4th, from western North America. The eclipse happens on Saturday evening for Australia and East Asia.