Space.com

Puerto Rico's Arecibo Observatory, the second-largest radio telescope in the world, is about to get a major upgrade.

Dozens of students got to see their experiments travel from school to space. A sounding rocket soared from a NASA rocket facility in Virginia Tuesday (Aug. 14), carrying several student experiments under the RockSat-X program.

Opportunity has been silent since June 10, when a monster Red Planet dust storm began blocking sunlight from reaching the solar-powered rover. But Opportunity's handlers still hope to get a ping once the dust has cleared.

Do you hold the cards to win a space race? That is the challenge laid out by "Space Heroes: Journey to Space."

Arecibo Observatory has been used to send a SETI message as well as for scanning the skies for approaching asteroids.

Earth and the moon play "peekaboo" behind Saturn's rings in this image from NASA's Cassini spacecraft.

China will launch its Chang'e-4 lander and rover mission in December in what will be the first ever attempt at a soft landing on the far side of the moon, authorities said Aug. 15

On Aug. 17, 1877, American astronomer Asaph Hall discovered Mars's moon Phobos. See how it happened in our On This Day in Space video series.

NASA says an Aug. 14 test of an engine for the Space Launch System was a success despite an unspecified "facility issue" that caused the test to end early.

Scientists using NASA's Chandra X-Ray Observatory have found evidence that hundreds of possible midsize black holes lurk at the core of smaller galaxies in the universe.

Muppet Labs did not immediately respond to requests for comment.

The strange radio bursts usually circle the Earth like electromagnetic ghosts, but scientists have now created and studied their shapes in a plasma chamber on Earth.

The Mendocino Complex Fire, the largest blaze in California's history, releases clouds of smoke in new photos from NASA, and fires blazing over Canada are visible from a million miles away in space.

The Hubble Space Telescope has been at work for almost three decades, but it's still learning new skills — like how to squeeze an incredible 15,000 galaxies into a single image.

Japanese startup Interstellar Technologies is developing the main engine for an orbital rocket designed to carry 100 kilograms and slated to conduct its initial test flight in 2020.

Asteroids are all around us in space — but they're awfully difficult to weigh

Small satellites that have propulsion systems, but don't have encrypted commanding systems, pose a small but real threat of being hacked and endangering other satellites, according to a new study.

Here's a guide to the major astronomical events of the next year, as well as space launches and milestones for spacecrafts already in travel.

The twin telescopes at the W.M. Keck Observatory are the largest optical and infrared telescopes in the world. The telescopes are located atop Mauna Kea, a dormant volcano in Hawaii.

A technology using a tiny laser tracker could help resolve one of the major challenges involved with the launching of cubesats: identifying individual satellites after their deployment.