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Science / Space

A polarized-light microscopy image (in background) of a section from the Allende meteorite is one-thousandth of a millimeter thin.

The Oldest Material in the Smithsonian Institution Came From Outer Space

Decades after the Allende Meteorite plunged to Earth, scientists still mine its fragments for clues to the cosmos

One of this issue's questions is about the starfish's namesake shape.

Why Are Starfish Shaped Like Stars and More Questions From Our Readers

You asked, we answered

This image taken by the Long-Range Reconnaissance Imager (LORRI) is the most detailed of Ultima Thule returned so far by the New Horizons spacecraft. It was taken at 5:01 Universal Time on January 1, 2019, just 30 minutes before closest approach from a range of 18,000 miles (28,000 kilometers), with an original scale of 730 feet (140 meters) per pixel.

Behold the Most Distant Object Ever Visited by Spacecraft

The New Horizons spacecraft has transmitted images from its New Year’s Day approach back to Earth

Artist’s impression of NASA’s New Horizons spacecraft encountering 2014 MU69, a Kuiper Belt object that orbits one billion miles (1.6 billion kilometers) beyond Pluto, on Jan. 1, 2019. With public input, the team has selected the nickname “Ultima Thule” for the object, which will be the most primitive and most distant world ever explored by spacecraft.

Ring in the New Year With NASA’s Most Distant Planetary Encounter in History

The New Horizons spacecraft is on final approach to the distant Kuiper Belt Object, Ultima Thule, and you can follow along live

A map of the moon with labeled features, from Selenographia by Johannes Hevelius.

The 17th-Century Astronomer Who Made the First Atlas of the Moon

Johannes Hevelius drew some of the first maps of the moon, praised for their detail, from his homemade rooftop observatory in the Kingdom of Poland

1960s science fiction illustration of lunar exploration.

The Missions to the Moon That Never Left the Drawing Board

From pioneers of science fiction to the height of the space race, these are the ideas for lunar flight that never launched

An artist's rendering of the small rover that will be deployed on the far side of the Moon as part of the Chang'e-4 mission.

China Launches First Mission to Land on the Far Side of the Moon

Not glimpsed by humanity until 1959, the surface of the far side of the Moon has never been visited before

The Ten Best Science Books of 2018

These titles explore the wide-ranging implications of new discoveries and experiments, while grounding them in historical context

An artists concept of the Origins Spectral Interpretation Resource Identification Security - Regolith Explorer (OSIRIS-REx) spacecraft collecting a sample from the asteroid Bennu.

Asteroid Sample-Return Mission Arrives to Collect Primordial Rocks of the Solar System

As the OSIRIS-REx spacecraft arrives at its target asteroid Bennu, scientists on the ground prepare for a new bounty of planetary samples

If Light Can’t Escape Black Holes, How Do We Get Photos of Them… and More Questions From Our Readers

You asked, we answered

One of NIST’s ytterbium optical lattice clocks.

Scientists Measure the Second With Record-Breaking Precision

A new generation of optical clocks are becoming ever more reliable as physicists work to redefine time

Scott Bolton says he first dreamed of traveling through the galaxy when he was a boy camping out under the stars.

2018 Smithsonian Ingenuity Awards

Meet Scott Bolton, the Visionary Behind the NASA Mission to Jupiter

The Juno project will take on the mysteries of the gas giant that may in turn help us understand our own planet’s origins

Illustration of NASA's InSight lander about to land on the surface of Mars.

Watch NASA Land the InSight Spacecraft on Mars

The InSight lander has successfully touched down on Mars

Once NASA's InSight lander touches down on the surface of Mars, it will use a seismometer to measure "Marsquakes," and a self-hammering heat probe will burrow five meters below the surface to study the internal heat of the planet.

NASA Will Attempt Its Eighth Mars Landing on Monday

Touching down on the surface of the Red Planet is one of the most difficult engineering challenges ever attempted, and InSight is about to give it a go

An artist’s impression of the newly discovered planet’s surface.

Astronomers Discover Second-Closest Known Exoplanet

The planet, a frozen Super-Earth, orbits Bernard’s Star about six light-years away

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Ingenious Minds

AOL Co-Founder Steve Case Talks With Smithsonian Geologist John Grant About the Search for Life on Mars

In the near future, we are going to know if life exists elsewhere in the universe

The NIST-4 Kibble balance, an electromagnetic weighing machine that is used to measure Planck's constant, and in turn, redefine the kilogram.

Scientists Are About to Redefine the Kilogram and Shake Up Our System of Measures

After more than 100 years of defining the kilogram according to a metal artifact, humanity is preparing to change the unit based on a constant of nature

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Ingenious Minds

Astrophysicist Michelle Thaller on Understanding Our Place in the Universe

Autodesk vice president Brian Mathews talks with the NASA science communicator about the search for life on other planets and why it’s important

A silica sphere with a radius of 50 nanometers is trapped levitating in a beam of light.

Optical Tweezers Give Scientists a Tool to Test the Laws of Quantum Mechanics

Quantum superposition is one of the great mysteries of physics—a mass existing in two states at once—and scientists hope to probe the phenomenon

An enhanced-color image of Mercury taken by the MESSENGER spacecraft in 2012 as part of a mission to map the geologic features of the planet.

Spacecraft Launching This Week Will Explore the Mysteries of Mercury

The BepiColombo mission will study the geology and magnetism of the smallest planet to search for clues of our solar system’s beginnings

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