Astronomers have long argued that dark matter is the invisible scaffolding that holds galaxies together. Without its immense gravitational pull, the rotational spins of galaxies would force them to simply fly apart. But now, scientists have found a string of galaxies that seem to be missing their dark matter entirely. The latest in this string, known as NGC 1052-DF9, is described in a new paper, available in pre-print on arXiv, by Michael Keim, Pieter van Dokkum and their team from Yale. It lends credence to a radical theory of galaxy formation known as the “Bullet Dwarf” collision scenario, which has been a controversial idea for the last decade.
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April's full Pink Moon dazzles as the first spring full moon of 2026 (photos)
"we have a beautiful moon rise, we're headed right at it."
NASA just launched Artemis 2. What happens today could make or break the moon mission
Artemis 2 is gearing up for a critical engine burn this evening (April 2), which will send the mission's four astronauts on a looping journey around the moon.
Artemis II: Journey to the Moon begins
Video: 00:02:12
Artemis II launched on 2 April at 00:35 CEST, (18:35 local time on 1 April), sending astronauts around the Moon for the first time in over 50 years. At the heart of the mission is ESA's European Service Module, which powers, propels and sustains the Orion spacecraft and its crew on their journey around the Moon and safely back to Earth.
There was a bit of toilet trouble on NASA's Artemis 2 mission to the moon
It wasn't their No. 1 problem, but it was a problem for going number one.
Why is the Artemis 2 rocket launch different from all other rocket launches?
That's one small sip of Manischewitz…
Artemis II mission begins
At 00:35 CEST today (18:35 local time on 1 April), NASA's Space Launch System rocket lifted off from the Kennedy Space Center in Florida, carrying four astronauts aboard the Orion spacecraft on Artemis II. At the heart of the mission is ESA's European Service Module, which powers, propels and sustains the Orion spacecraft and its crew on their journey around the Moon and safely back to Earth.
NASA launches 4 astronauts to the moon on historic Artemis 2 voyage, a lunar leap for the 21st century
NASA launched its Artemis 2 mission today (April 1), sending astronauts toward the moon for the first time in more than 50 years.
Artemis 2 Mission Launches for Trip Around the Moon
NASA’s Artemis 2 mission has departed Earth, as humans return to cis-lunar space after more than 50 years.
'Project Hail Mary' end credits showcase stunning nebula photos captured over 400 hours by a single astrophotographer — here's the inside story
It started with an Instagram message, and ended on the silver screen.
2 bright planets light up April evenings — here's where and when to look
Venus and Jupiter dominate April's evening sky, while Mercury, Mars and Saturn linger in the dawn — here's how and when to spot them all.
The Largest Known Galaxy: Alcyoneus
The universe is home to an astonishing variety of galaxies, from small dwarf galaxies to colossal spirals. Among the known galaxies, Alcyoneus currently holds the distinction of being the largest known galaxy by physical size.
What do scientists hope to learn from NASA's historic Artemis 2 moon flyby?
Here's what's on the experiment roster for the Artemis 2 moon mission.
NASA's Artemis 2 moon launch may be visible from Florida and southern Georgia today. Here's when to look
Here's where you need to be to see the Artemis 2 moon rocket launch with your own eyes.
Watch Artemis 2 fly through space in real time with this telescope livestream tonight
A Virtual Telescope Project livestream aims to track NASA's Artemis 2 Orion spacecraft — here's how to watch it as it travels through space.
Exploding Primordial Black Holes Might Have Reshaped the Early Universe - And Created All Matter As We Know It
The early universe is absolutely so far outside our understanding of how the world works it's hard to describe in words. Back then, the cosmos wasn’t filled with stars and galaxies but with a boiling soup of quarks and gluons, with a few microscopic black holes thrown in, occasionally detonating like depth charges. That’s the early universe theorized by a new paper, available in pre-print from arXiv, from researchers at Vrije Universiteit Brussel and MIT anyway.
April's full 'Pink Moon' rises tonight — just as NASA readies its Artemis 2 moon mission
The "Pink Moon" will rise on the same day Artemis 2 is due to launch a crew of 4 to lunar space.
Satellite spies SpaceX Starlink before it breaks apart | Space photo of the day for April 1, 2026
SpaceX Starlink spacecraft was seen prior to breaking up in orbit by a satellite.
Saturn's magnetic field is curiously warped, and one of its moons may be to blame
"A better understanding of Saturn’s environment is especially urgent now as plans for our return to Saturn and its moon Enceladus start to be developed."
NASA set to launch Artemis 2 moon mission today, the 1st crewed lunar flight since 1972
NASA plans to make history today (April 1) with the launch of Artemis 2, the first crewed moon mission since Apollo 17 in 1972.
Christine Klein takes up duty as acting Director of Controlling, Finance and Operational Procurement
Christine Klein took up duty as acting Director of Controlling, Finance and Operational Procurement (D/CFO) at the European Space Agency on 1 April 2026. She will lead the newly established directorate during its consolidation.
