Giant fusion project in big trouble.

ITER operations delayed to 2034, with energy-producing reactions expected 5 years later.

No place like home.

The hunt for Earth-like planets has run into headwinds. Some astronomers are looking for signs of habitability on bigger worlds.

Probe bolsters model of ever-expanding universe.

Theorists intrigued by hints of weakening dark energy in largest yet 3D galaxy map.

Brightest gamma ray burst ever emerged from collapsing star.

NASA's JWST telescope traces burst to a supernova but finds a puzzling lack of heavy elements.

U.S. giant telescopes imperiled by funding limit.

NSF faces choice between multibillion-dollar projects after board sets cost cap.

Can quantum tech give telescopes sharper vision?

Quantum memories and networks could help combine light from widely separated mirrors.

X-ray survey bolsters theory of universe's expansion.

eROSITA telescope shows galaxies' "clumpiness" matches predicted effect of dark energy, dark matter.

Stellar remains of 1987 supernova found at last.

NASA's JWST telescope spots fluorescing gas inflamed by surviving neutron star.

Magellanic cloud may be two galaxies, not one.

Rethink of familiar object may boost odds that its name, offensive to some, will be changed.

Is NASA too pessimistic about space-based solar power?

Agency says orbiting power stations would be costly, but rocketry breakthroughs could make it economical.

Second image of 'shadow' confirms giant black hole is real.

To zoom in farther, Event Horizon Telescope wants to add more radio dishes to its network-and go to space.

Unique Moon sites could be 'lost forever' in mining rush.

Researchers seek protection for pristine areas on Moon's far side and polar regions.

Sculptors of short light pulses win physics Nobel.

Researchers share prize for attosecond laser flashes that capture the motion of electrons.

Makers of tiny, tunable points of light win chemistry Nobel.

Researchers share award for developing quantum dots, which fluoresce in vivid colors determined by their size.

Giant European scope rises as U.S. rivals stumble.

Past the halfway point, Extremely Large Telescope prepares to receive first mirrors.

Did interstellar debris fall to the sea floor? Experts are doubtful.

Controversial astrophysicist says metallic spheres hail from outside the Solar System, but others say it's "nonsense".

Quasar at cosmic dawn challenges theorists.

Black hole 40 million times the Sun's mass formed puzzlingly fast.

After string of failures, Japan aims to launch x-ray telescope.

Groundbreaking XRISM will capture spectra, revealing the motion and composition of million-degree gases.

Observatory to probe origins of ferocious gamma rays.

With approval imminent, construction will soon begin on Cherenkov Telescope Array.