Cracks on Europa's surface.

A jet stream in Europa’s ocean?

Jupiter’s moon Europa likely has a subsurface ocean, possibly salty, with volcanic vents on its ocean floor. A new study suggests it might also have an oceanic jet stream, comparable to the Gulf Stream back here on Earth.

A grid placed across a portion of the sky.

Astronomers discover 83 more supermassive black holes

Astronomers used a cutting-edge camera mounted on one of the world’s largest telescopes to discover 83 new quasars – powered by central, supermassive black holes – in the very early universe.

Storm in a cosmic teacup

Nicknamed the Teacup because of its shape, this quasar is causing a cosmic storm in a distant galaxy. The source of the squall is a supermassive black hole buried at a galaxy’s center.

Mining the moon

How can the cost of space travel – to and from the moon and possibly to Mars – be reduced? One approach is to mine the moon for necessary resources.

Different types of stars.

Goldilocks stars: Just right for habitable planets

Which stars are the most likely to have habitable planets? A new study suggest that K stars – between the dimmest M-type red dwarfs and sunlike stars – might provide the sweet spot for life.

Artist's concept of star leaving Milky Way galaxy over millions of years.

Hyper-runaway star fled Milky Way disk

University of Michigan astronomers say a hyper-runaway star didn’t originate from the galaxy’s center, as previously believed. Instead, they say, a cluster of young stars booted it from the galaxy’s disk.

Surface of Mars, showing a hill, rover tracks and a rocky outcrop, annotated.

See the Opportunity rover’s last image

Opportunity – nicknamed “Oppy” – was active on Mars from 2004 until June, 2018, when a planet-wide dust storm covered it. Its final image is a panorama, acquired from Opportunity’s final resting place in Mars’ Perseverance Valley.

Woot! 4,001 exoplanets and counting 

The Exoplanet Team, led by the Observatoire de Paris, announced this week that the list of known exoplanets – planets orbiting distant stars – has grown to 4,001!

Small asteroid to sweep closer than moon’s distance

The house-sized asteroid – designated 2019 EA2 – will pass safely by our planet on the night of March 21-22, 2019.

Today in science: Uranus discovered by accident

William Herschel spotted Uranus in 1781 during a routine survey of the stars. It was the 1st new planet found since ancient times.

Today in science: Tau Boötis’ pole flip

Tau Boötis was the 1st star other than our sun seen to undergo a magnetic reversal. This post includes 2 great videos about our sun’s pole flips.

A wide orange outflow of gas, encompassing a blue jet, from a misaligned central point.

Astronomers probe a baby star’s mystery gas flows

They used the ALMA telescope to observe a slow outflow and a high speed jet from a newly forming star. These two streams appear misaligned and were apparently launched from different parts of the star-forming disk.

A spiral galaxy, with globular clusters scattered around it.

How Hubble and Gaia weighed the Milky Way

Scientists used the measured velocities of 44 globular star clusters to measure the mass of our home galaxy, the Milky Way.

Rogue planet floating in space.

There may be 50 billion free-floating planets in our galaxy

There are at least 200 billion stars in our galaxy, and perhaps even a greater number of planets. Now a new study suggests there could be an additional 50 billion rogue planets, not orbiting any stars.

Eclipse shows moon move in reverse

Check out this interesting eclipse of the sun by Earth’s moon on March 6. A NASA spacecraft saw it. During the eclipse, the moon appears to reverse its direction!

What is earthshine?

In the coming evenings, you might glimpse a pale glow on the unlit part of the crescent moon in the west after sunset. It’s called earthshine.

In the foreground, a curve of a rocky planet, with atmosphere above. In the background, a red star.

Clouds for some Earth-sized TRAPPIST-1 exoplanets

The red dwarf star TRAPPIST-1 – about 40 light-years away – has 7 Earth-sized exoplanets orbiting it. A new study puts limits on how many of those worlds have hazy or cloudy atmospheres.

How the moon got its sunburn

Every object, planet or person traveling through space has to contend with the sun’s damaging radiation – and the moon has the scars to prove it.

Watch SpaceX Crew Dragon splashdown March 8

The SpaceX Crew Dragon spaceship will leave the International Space Station and splash down in the Atlantic Ocean on Friday, March 8, 2019. How to watch both events live.

Black hole found near Milky Way’s heart

It’s not supermassive, but only an intermediate-mass black hole, near the center of the Milky Way. It might be one of over 100 million quiet black holes lurking unseen in our galaxy.