Stories by Jonathan O'Callaghan

A new way to gauge the universe’s expansion rate has delivered a confusing result that may conflict with previous related measurements

New results from a U.A.E. orbiter suggest Mars’s moons may be pieces of the planet. A Japanese mission will tell us for sure

We now know that the first galaxies in our universe formed shockingly fast, thanks to the latest results from the James Webb Space Telescope

A half-kilogram’s worth of samples gathered by NASA’s Perseverance rover for eventual return to Earth holds weighty implications for life on Mars

A new European mission is the first of two spacecraft—with the other coming from NASA—that will hunt for signs of habitability on Jupiter’s icy moons

The “amorphous” solid is denser and could be water “frozen in time”

The James Webb Space Telescope is opening an exciting new chapter in the study of exoplanets and the search for life beyond Earth

New Horizons is about to wake up and study the Kuiper Belt, the universe, and even Uranus and Neptune. But a new target to visit could trump them all

Researchers are convinced the James Webb Space Telescope has glimpsed an unexpected population of galaxies in the early universe. Now they’re trying to decide what this means for our understanding of the cosmos

Elon Musk’s Starlink and other satellite sources of light pollution and orbital debris should face an environmental review, the U.S. Government Accountability Office finds

The DART spacecraft has purposefully crashed into the asteroid Dimorphos, hopefully changing its orbit by a few minutes, in a milestone test of future planetary defense techniques

A new potential rule from the U.S. Federal Communications Commission would set a five-year deadline for defunct satellites to be removed from space

The James Webb Space Telescope’s first images of the distant universe shocked astronomers. Is the discovery of unimaginably distant galaxies a mirage or a revolution?

Seismology has been a long-overlooked tool in planetary exploration, but the success of NASA’s InSight lander has reignited the field

The suits, supplied by Axiom Space and Collins Aerospace, will be used in NASA’s upcoming Artemis lunar missions and will protect space travellers from micrometeoroids, moon dust and even vomit

Russia’s invasion of Ukraine ended hopes of launching the ExoMars rover in 2022. Now the mission may never lift off at all

After delivering extraterrestrial samples to Earth in 2023, OSIRIS-REx will embark on an extended mission to a potentially planet-threatening space rock

Scientists are beginning to dream of how a new generation of super-heavy-lift rockets might enable revolutionary space telescopes and bigger, bolder interplanetary missions

NASA’s Mars Ascent Vehicle will attempt a wildly unconventional liftoff to bring Red Planet samples back to Earth

Weighing in at seven times the mass of our sun, the dark object is by far the best-yet candidate for a free-floating stellar-mass black hole

Kepler-1708 b-i appears to be a giant moon orbiting a Jupiter-sized planet thousands of light-years from Earth

Independent concepts from each nation envision launching high-speed spacecraft on aspirational multigenerational voyages into the great unknown of interstellar space

With a density close to that of pure iron, GJ 367b may be the remnant metal-rich core of an evaporated giant world

A privately funded telescope called Toliman will seek habitable worlds in our nearest neighboring star system, potentially sparking a new wave of exoplanetary exploration