Astronomers report on the very distant galaxy XMM-2599. It existed when the universe was very young, yet contains some 300 billion stars. It must have formed stars at a very rapid rate and then stopped. Why?

Isn't this cool? Scientists at the famous Arecibo Observatory in Puerto Rico made this rare find just days after resuming post-earthquake operations. It's a moon orbiting the near-Earth asteroid 2020 BX12.

A new study from the Planetary Research Institute suggests that briny water could temporarily form on Mars' surface in the shadows of boulders for just a few days each Martian year.

The European Southern Observatory's Very Large Telescope is in northern Chile. Astronomers used it to capture the unprecedented dimming of Betelgeuse, a red supergiant star in the constellation of Orion. The new images show how the apparent shape of this star is changing.

For the first time, a fast radio burst has been found to be repeating, in a regular 16-day cycle. The baffling detection from the CHIME radio telescope deepens the mystery of these bizarre intergalactic objects.

An astronomer reports on a very old galaxy cluster - labeled XLSSC 122 - whose light has taken 10.4 billion years to travel across the universe to us.

ESA's sun-exploring Solar Orbiter will be the first spacecraft ever to fly over the sun's poles. It'll study the origin of the solar wind, which has the potential to affect earthly technologies.

A “beating heart” of frozen nitrogen controls Pluto’s winds and may give rise to features on its surface, according to a new study.

We think of Uranus and Neptune almost as twins. In some ways, they are very similar. But a new study by researchers at PlanetS explains why, in some aspects, they are also radically different.

Solar Orbiter - aka SolO - will take the first direct images of the sun’s poles. Following Sunday's launch, the spacecraft will take a loopy path through the inner solar system, borrowing thrust from the powerful gravitational fields of Earth and Venus.