41–60 of 4,933 results
Young solar system

Solar System

Radioactive Aluminum Sheds Light on Solar System History

Astronomers thought giant stars were reponsible for flooding the early system with a radioative isotope — but the Sun itself might have made it.

Superimposed: Mars river valley networks and Devon Island channels

Solar System

Was Early Mars "Wet and Warm"? Or Wet and Cold?

A new model suggests that Martian valley networks might have been created by ancient subglacial rivers rather than water flowing on the surface.

Night Sky Sights

August 2020: Planets & Perseids

The Perseids are upon us — and as you're looking out for shooting stars, look for Jupiter and Saturn low in the southeast as soon as night begins to fall.

Dust-enshrouded neutron star in Supernova 1987A

Stellar Science

Neutron Star Found in Supernova 1987A

After decades of searching, astronomers have finally found the collapsed core of the nearest supernova recorded in recent history.

KIDS survey

Cosmology

Our Unexpectedly Smooth Universe May Point to New Physics

The latest data release from a survey of 31 million galaxies reveals that our universe is even smoother than we thought it was.

Perseverance launch

Solar System

NASA Launches Perseverance Rover for Mars

NASA’s Perseverance rover heads to the Red Planet.

Looking back at Pluto

Solar System

Cool Off with Pluto This Summer

Pluto might be a challenging target but it's well worth the effort. Grab your telescope and see if you can spot this distant, chilly world.

Take this one for a whirl

Galaxies

Remains of an Ancient Star Cluster Revealed

A torn-apart globular cluster provides a window into the Milky Way's past.

Astronomy and Society

A Message from Sky & Telescope

The staff of Sky & Telescope outline an action plan for making the night sky open to all. Feedback from the community is welcome!

Rover tracks on Mars

Solar System

Three Missions Head for Mars

The summer of 2020 will see three spacecraft launch toward the Red Planet, each one with distinct objectives.

Artist’s illustration of a magnetar

Stellar Science

An Infant Pulsar Defies Categorization

The discovery of the youngest pulsar yet has lead astronomers to question the current classification system of these objects.

Spacecraft and Space Missions

China Launches Tianwen 1 Mars Mission

China launches its first Marsbound mission, Tianwen 1, which carries an ambitious orbiter, lander, and rover package.

people in a small boat pass in front of a large iceberg

Celestial News & Events

500 Days Until the Total Solar Eclipse Over Antarctica

Travel to the ends of the Earth to experience a special — but risky — total solar eclipse in Antarctica.

Two giants orbit a Sun-like star

Exoplanets

First Image of a Young Sun and Two Giant Planets

For the first time, astronomers have imaged multiple planets orbiting a Sun-like star.

EBOSS map of the universe

Cosmology

New 3D Map of the Universe — and a Growing Cosmological Debate

The Sloan Digital Sky Survey has released a new map of the universe — and the results confirm ongoing tension over the expansion rate of the universe.

Spacecraft and Space Missions

United Arab Emirates Launches Mars Hope Orbiter

United Arab Emirates joins the "planetary space club" with an ambitious mission to Mars.

Brown dwarf

Stellar Science

Citizen Scientists Help Discover “Weird” Brown Dwarfs

Astronomers and citizen scientists have found two would-be stars lacking heavy elements. They’re most likely ancient survivors of our galaxy’s earliest days.

Magma ocean and crust

Solar System

Long-lived Lunar Magma Ocean Points to a Younger Moon

Most lunar scientists today think that the Moon formed after a Mars-size body hit the still-forming Earth, launching enough material into orbit to form our satellite. But there is still lively debate about the age of the Moon, and its evolution after it formed. A Mars-size body smashed into Earth…

James Webb Space Telescope system test

Spacecraft and Space Missions

New Launch Date for James Webb Space Telescope

NASA has delayed its beleaguered James Webb Space Telescope to October 2021, in part due to the COVID-19 pandemic.

The Sun's full disk

Solar System

European Solar Orbiter Takes Closest-ever Images of the Sun

The first images to be released from the European Space Agency’s Sun-imaging spacecraft show intriguing “campfires” that could help explain a solar mystery.

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