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Life in Space - Search for Extraterrestrial Intelligence
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A view of the Hubble Space Telescope in orbit. Hubble is one of NASA's four "Great Observatories," which launched between 1990 and 2003. The agency has been urged to start a new Great Observatories program, to help get big, powerful space telescopes off the ground more efficiently.

New era of 'Great Observatories' may be coming for NASA

By Mike Wall

The four original Great Observatories, which launched between 1990 to 2003, provide a good example to follow.

An artist’s impression of an Earthlike exoplanet orbiting a star similar to our own sun.

Astronomers target habitable exoplanets, black holes and inclusivity as top priorities for next decade

By Mike Wall

The newly released astronomy and astrophysics decadal survey flags the discovery and study of habitable exoplanets and the exploration of black holes and neutron stars as two top research priorities.

An artist's depiction of what the surface of the potentially habitable exoplanet Proxima b might be like,

NASA scientists propose new 'alien life evidence' scale

By Elizabeth Howell

As the search for alien life heats up, scientists may need to step up their reporting game a bit.

Are we listening in vain?

SETI: Why extraterrestrial intelligence is more likely to be artificial than biological

By Martin Rees

Is there intelligent life elsewhere in the universe?

A still from a U.S. Navy video of a UFO sighting.

UFOs and UAP: History, sightings and mysteries

By Mike Wall

REFERENCE Read on for a brief history of UFO sightings, potential explanations for them, and cultural attitudes toward the phenomenon.

REFERENCE
This wide-field view of the sky around the bright star system Alpha Centauri was created from photographic images forming part of the Digitized Sky Survey 2.

Mysterious radio signal from Proxima Centauri was definitely not aliens

By Charles Q. Choi

Potential evidence of extraterrestrial radio signals from Proxima Centauri, the closest star to Earth, were likely just interference from human technology, researchers say.

Inferred paleolake level inside Mars’ Jezero Crater at the time of Kodiak sediment deposition. The red star indicates theOctavia E. Butler (OEB) landing site of NASA’s Perseverance rover. Background from the Context Camera (CTX) mosaic.

Perseverance rover confirms existence of ancient Mars lake and river delta

By Mike Wall

Photos snapped by Perseverance show that Jezero Crater did indeed host a large river-fed lake in the ancient past.

Mars as seen from orbit by NASA’s Viking mission.

Mars: What we know about the Red Planet

By Charles Q. Choi

Learn about planet Mars’ atmosphere, water supply and the possibility to support life, plus findings from the various Mars rover missions.

Artist's illustration of a Mars with Earth-like surface water. The Red Planet was a wet world in the ancient past.

Mars was always too small to hold onto its oceans, rivers and lakes

By Mike Wall

Mars was doomed to desiccation by its small size, a new study suggests.

An image taken by the Perseverance rover on Mars shows a rock called Rochette with holes where the rover obtained its first two samples.

NASA's Perseverance rover has taken the 1st steps in decades-long dream of Mars sample return

By Meghan Bartels

NASA's Perseverance rover on Mars has begun its out-of-this-world rock collection.

NASA's Perseverance rover has collected two drilled-out samples from this Red Planet rock, which the mission team calls "Rochette."

Perseverance rover collects 2nd Mars sample (photos)

By Mike Wall

Perseverance collected another drilled-out core of a Martian rock dubbed "Rochette," sealing the sample in its designated titanium tube on Wednesday (Sept. 8).

This composite of two images shows the hole drilled by NASA's Perseverance rover into a rock dubbed “Rochette” during its second sample-collection attempt. The photos were obtained by one of the rover's navigation cameras on Sept. 1, 2021.

NASA's Perseverance rover getting ready to snag 2nd Mars sample

By Mike Wall

Perseverance sealed up a drilled-out core of a Red Planet rock dubbed "Rochette" over the weekend. The mission team aims to replicate that success soon, putting poor Rochette to the drill again.

This sealed titanium sampling tube contains the first sample ever collected by NASA's Perseverance rover on the surface of Mars. The photo was captured by Perseverance's Sampling and Caching System Camera, or CacheCam.

Perseverance rover seals up 1st Mars sample for future return to Earth

By Mike Wall

It's official: NASA's Perseverance rover has collected its first-ever Mars sample.

This image, captured by NASA's Perseverance Mars rover on Sept. 1, 2021, shows a cored sample in one of the robot's sampling tubes. Mission team members think the sample was retained but will take a few more photos to make sure.

NASA's Perseverance rover drills 1st Mars rock sample for an (eventual) return to Earth

By Mike Wall

Perseverance has likely snagged its first-ever Red Planet sample, socking away a drilled-out core of a rock dubbed "Rochette."

NASA's Perseverance Mars rover acquired this image of the rock “Rochette” on Aug. 27, 2021. A circular abrasion made by Perseverance as part of its Rochette-vetting process is clearly visible.

Mars rover Perseverance set for 2nd sample-collection attempt (photo)

By Mike Wall

NASA's Perseverance rover is on track to collect its first-ever Mars sample in the next few days.

NASA's Perseverance Mars rover will soon abrade the rock at the center of this image, dubbed “Rochette,” allowing scientists and engineers to assess whether it would hold up to the rover's more powerful sampling drill.

Perseverance Mars rover gearing up for 2nd rock sampling attempt (photos)

By Mike Wall

Perseverance could drill and sample a rock target dubbed 'Rochette' as early as next week.

Artist's illustration of the view from the seas of a potentially habitable "Hycean" exoplanet.

Alien life could thrive on big 'Hycean' exoplanets

By Mike Wall

The search for alien life should broaden its horizons a bit, a new study suggests.

A still from a U.S. Navy video of a UFO sighting.

The new reality of UFOs: An interview with journalist Leslie Kean

By Leonard David

Space.com recently caught up with author and journalist Leslie Kean to discuss UFOs and where research into the puzzling objects is heading.

This image taken by one the hazard cameras aboard NASA’s Perseverance rover on Aug. 6, 2021, shows the hole drilled in what the rover science team calls a “paver rock” in preparation for the mission’s first attempt to collect a sample from Mars.

NASA's 1st attempt to collect Mars samples with Perseverance rover comes up empty

By Mike Wall

Perseverance drilled its first sample-collecting hole on Friday (Aug. 6), but data beamed back to Earth by the rover indicate that no Mars rock or dirt made it into the sampling tube.

NASA's Curiosity rover has been exploring Mars' Gale Crater since touching down on its floor in August 2012.

Giant ancient lake in Gale Crater on Mars? New study offers different view.

By Mike Wall

Mars' Gale Crater may not have been so wet after all, a new study suggests.