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The first color image of the comet C/2019 Q4 (Borisov), which astronomers believe was born in another solar system, was captured by the Gemini North telescope at Hawaii's Mauna Kea. Gemini North acquired four 60-second exposures in two color bands (red and green). The blue and red lines are stars moving in the background.

We Could Chase Down an Interstellar Comet Borisov by 2045

By Mike Wall

We could get an up-close look at our solar system's latest interstellar interloper a quarter century from now if we so desired, a new study suggests.

The golden ratio is one of the most famous irrational numbers; it goes on forever and can't be expressed accurately without infinite space.

Long-Standing Problem of 'Golden Ratio' and Other Irrational Numbers Solved with 'Magical Simplicity'

By Leila Sloman - Scientific American

Mathematicians have finally proved a conjecture on approximating numbers with fractions.

An image overlay shows one of Hayabusa2's target markers falling slowly to the surface of the asteroid Ryugu on Sept. 16, 2019.

Look Out Below! Japan's Hayabusa2 Drops Target Markers on Asteroid Ryugu

By Meghan Bartels

Japan's asteroid-exploring spacecraft has practiced its last task before heading home — and it made a nifty image as well.

This artist's illustration depicts a hypothetical dust ring orbiting KIC 8462852, also known as Boyajian's Star or Tabby's Star.

'Alien Megastructure' Star May Not Be So Special After All

By Charles Q. Choi

More mysteriously dimming stars have been spotted.

China's Yutu-2 moon rover captured this image from the edge of the small crater where it found a mysterious, gel-like material.

China's Lunar Rover Scopes Out Weird Substance on Far Side of the Moon (Photos)

By Andrew Jones

China's lunar exploration program has released images that give us a glimpse of the mysterious material discovered on the far side of the moon.

Young people protest government inaction about Earth's climate emergency.

Students Worldwide Mobilize for Climate Action

By Mindy Weisberger

On Friday (Sept. 20), students around the world will walk out of their classrooms and gather in coordinated protests to highlight the global crisis created by climate change.

A still from a video produced by ISRO showing how its Vikram lander was meant to touch down on the moon on Sept. 6, 2019.

Time Is Running Out for India to Save Its Silent Moon Lander

By Meghan Bartels

Even as its orbiter settles into work, India's hopes of resurrecting its moon lander are quickly evaporating as the country marks two weeks from its attempt to softly touch down on the lunar surface.

City lights around the Nile River and its delta sparkle by night in this stunning view from the International Space Station. When an Expedition 60 astronaut captured this photo, the International Space Station was flying 255 miles (410 kilometers) above the border between Sudan and Egypt around 1 a.m. local time on Sept. 2.

Pictures from Space! Our Image of the Day

By SPACE.com Staff

City lights around the Nile River and its delta sparkle by night in this stunning view from the International Space Station.

An artist's depiction of an asteroid collision in outer space.

Asteroid Dust Triggered an Explosion of Life on Earth 466 Million Years Ago

By Meghan Bartels

Consider the possibility that an asteroid may have transformed the picture of life on Earth — but forget the dinosaurs and the massive crater, and rewind an extra 400 million years.

Kristen John, principal investigator of the Hermes mission, with two pieces of the system.

Hermes Regolith Experiment in Space Takes Aim at Moon Dirt and Asteroid Landings

By Kasandra Brabaw

By 2024, NASA plans to land the next two people on the moon, including the first woman who will ever walk on the lunar surface.

On Sept. 2, the Indian Space Research Organisation's Chandrayaan-2 moon orbiter successfully released its Vikram lander, as seen in this illustrated depiction. But Vikram's landing attempt on Sept. 6 did not go as planned; mission control lost contact with Vikram just before touchdown, and the lander has been silent ever since.

NASA Moon Orbiter Fails to Spot India's Lunar Lander: Report

By Leonard David

NASA’s Lunar Reconnaissance Orbiter (LRO) has reportedly failed to spot India’s Chandrayaan-2 lunar lander, which apparently crashed during its Sept. 6 touchdown attempt.

SOFIA, an airborne observatory run by a joint program between NASA and Germany's space program, DLR, is seen here in Palmdale, California, before its flight to Germany in September 2019

NASA's Airborne Observatory SOFIA Takes Flight Over Europe Today

By Doris Elin Urrutia

Today (Sept. 18) a unique airborne space observatory will perform its first scientific flight over Europe.

The plumes of the Saturn moon Enceladus, captured spewing from the moon's surface by NASA's Cassini spacecraft from a distance of 9,000 miles (14,000 kilometers) in 2010. One new study suggests that Enceladus' geysers act like a "snow-cannon" and makes Saturn's inner moons more reflective.

'Snow-Cannon' on Enceladus May Make Other Moons Shine

By Chelsea Gohd

A new study suggests that Enceladus' geysers act as a 'snow-cannon,' making nearby moons snowy and reflective.

gravitational waves from two merging black holes.

Stephen Hawking Was Wrong. Black Holes Are Bald.

By Rafi Letzter

This image, captured by NASA's Voyager 1 spacecraft, shows a plume rising from Loki Patera, the largest volcano on the Jupiter moon Io.

It's Gonna Blow! Giant Volcano on Jupiter Moon Could Erupt Any Day

By Mike Wall

A giant volcano on the Jupiter moon Io should erupt any day now, a new study suggests.

A view of Io's shadow on the surface of Jupiter captured by NASA's Juno probe.

NASA's Juno Mission Checks Out Eclipse on Jupiter

By Meghan Bartels

Don't panic, this isn't a massive hole on Jupiter. All is well on our largest neighbor; NASA's Juno spacecraft just managed to spot the shadow of its moon Io passing over its marbled clouds.

In an artist's concept, the Indian lander Vikram nears the lunar surface.

Why Is It So Hard to Land on the Moon?

By Adam Mann

Despite the fact that humans landed on the moon many times during the Apollo missions half a century ago, doing so remains a tough business.

Image of Jupiter processed from images obtained by Ethan Chappel shortly after the impact. An image of the flash produced by the impact has been included at its right location over the color image.

Astronomers Get the Goods on Jupiter-Smacking Space Rock

By Mike Wall

The space rock that whacked Jupiter last month has lost its air of mystery.

The VISTA telescope from the European Southern Observatory captured this new, "unprecedented" look at the nearby dwarf galaxy known as the Large Magellanic Cloud.

Large Magellanic Cloud Shines in 'Unprecedented' New Telescope Imagery

By Doris Elin Urrutia

Beyond the border of our Milky Way lies a fascinating satellite galaxy that takes center stage in new imagery.

Sand dunes ripple near Mars' north pole in this image captured by the European/Russian Trace Gas Orbiter. The photo was taken on May 25, 2019, and released on Sept. 16.

Sand Dunes Snake Near Mars' North Pole (Photo)

By Mike Wall

Rippling, dark-flecked sand dunes near Mars' north pole look like melting chocolate-chip ice cream in an image captured by the European-Russian Trace Gas Orbiter.