Photo of the Whirlpool galaxy (M51) with a bridge of stars leading out to its smaller dwarf companion, NGC 5195

Galaxy collision to send solar system flying?

A new computer simulation shows the Large Magellanic Cloud is hurtling toward our galaxy on a collision course. Could the collision knock our solar system out of the Milky Way?

The left image shows the hydrogen gas density of a simulated dwarf galaxy, viewed from above. The right image shows the same for a real dwarf galaxy, IC 1613. In the simulation, repeated gas inflow and outflow causes the gravitational field strength at the center of the dwarf to fluctuate. The dark matter responds to this by migrating out from the center of the galaxy, an effect known as ‘dark matter heating’.

Dark matter on the move

New evidence suggests that dark matter – the mysterious stuff that makes up a significant percentage of the universe’s mass – can heat up and move around.

A simulated image of the far side of the moon - showing the line of sunrise across the moon's face - on the night Chang'e-4 set down.

China’s Chang’e-4 lands on moon’s far side

China’s Chang’e-4 spacecraft set down last night, according to clocks in the Americas. It’s a historic event, the first time a spacecraft has landed on the side of the moon we cannot see.

Oxygen and life: a cautionary tale

On Earth, oxygen is a signature byproduct of life. But what if astronomers found oxygen in the atmosphere of a planet orbiting a distant sun? Would that prove life exists there? Not necessarily, says a new study.

Are December’s solstice and January’s perihelion related?

December solstice 2018 was December 21. Earth was closest to the sun for 2019 on January 2-3. Coincidence?

Photo of Ultima Thule shows it looks like 2 snowballs stuck together

Ultima Thule seen in detail

Ultima Thule – a Kuiper Belt object and the most distant object yet seen by an earthly spacecraft – is now revealed as a “contact binary,” created when two small bodies in the early solar system stuck together.

Amazing photo of a meteor streaking right in front of Venus

EarthSky’s 2019 meteor shower guide

All you need to know about major meteor showers in 2019.

Has Mars’ methane gone missing?

The 1st results from ESA’s Trace Gas Orbiter mission at Mars have been released and – surprise – no atmospheric methane. That’s even though methane on Mars has been observed multiple times before. Where is it?

How many supermoons in 2019?

We’ll have a series of 3 full supermoons on January 21, February 19 and March 21, 2019. Of these, the February 19 full moon will be the closest and largest full supermoon of 2019.

Artist's concept showing OSIRIS-REx spacecraft lassoing asteroid Bennu

Spacecraft orbits tiny Bennu, breaks record

On December 31 – while we celebrated – NASA’s OSIRIS-REx spacecraft went into orbit around Bennu, a near-Earth asteroid. The maneuver makes Bennu the smallest object yet to be orbited by a spacecraft.