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The Milky Way glitters in the predawn sky over Portugal's Guadiana River in this image by astrophotographer Sérgio Conceição. Saturn, Jupiter and the bright star Antares appear embedded in the Milky Way's dusty arc, while the bright star Spica dominates the sky to the right. In the foreground of this photo is the 500-year-old Bridge of Ajuda.

The Most Amazing Space Photos This Week!

By Doris Elin Salazar

Here are our picks for the most amazing space photos of the week.

U.S. Department of Defense headquarters

Space Development Agency Promises to Do More with Less

By Sandra Erwin

The Space Development Agency officially came into existence last week and already is causing a stir.

A copper alloy astrolabe found in a shipwreck in Oman dates to between 1496 and 1501, making it the oldest mariner's astrolabe ever discovered.

Mariner's Astrolabe from 1503 Shipwreck Is World's Oldest

By Stephanie Pappas

An astrolabe found at a shipwreck site in Oman is the oldest one ever discovered.

This image, taken by New Yorker John Draper in 1840, is the first photo of the moon.

On This Day in Space! March 23, 1840: First Photo of the Moon

By Hanneke Weitering

On March 23, 1840, a New Yorker named John William Draper became the first person to take a photo of the moon. See how it happened in our On This Day in Space Video Series.

The pulsar J0002+6216 streaks away from the bubble-like supernova remnant CTB 1. This composite image combines radio, visible light and infrared data. CTB 1, if viewed in the night sky, would appear to be the size of a full moon.

Whirling 'Cannonball' Pulsar Flees Supernova Site at Epic Speed

By Sarah Lewin

A supernova explosion flung out a super-dense, whirling stellar core, sending it streaking across space at almost 2.5 million miles per hour with a glowing trail 13 light-years long in its wake.

The 4-lb. Mars Helicopter will travel to the Red Planet with NASA's next Mars rover, which is scheduled to launch in mid-2020.

2020 Mars Helicopter Could Open Alien Skies to Exploration

By Mike Wall

A few brief hops in the Martian air two years from now could open alien worlds to an entirely new kind of exploration.

NASA's Terra satellite captured this image of the fireball that exploded over the Bering Sea on Dec. 18, 2018.

Powerful Bering Sea Fireball Spotted from Space in NASA Photos

By Mike Wall

NASA's Terra satellite captured striking views of the meteor that exploded over the Bering Sea on Dec. 18, 2018.

The forces of light and dark are basically equal at this moment on Earth.

Day and Night Are Perfectly Balanced in Spring Equinox Photo Snapped from Space

By Laura Geggel

Earth just got another dazzling glamour shot, thanks to a satellite that snapped its photo on the March 20 spring equinox.

NASA astronauts Christina Koch (left) and Nick Hague (right) try on their spacesuits for a fit check to prepare for their upcoming spacewalks at the International Space Station. NASA astronaut Anne McClain lends a hand.

Space Webcasts: Astronauts Take Spacewalk Outside Space Station

By SPACE.com Staff

Two NASA astronauts took a spacewalk outside the International Space Station Friday, March 22, to swap out huge batteries.

NASA astronauts Nick Hague (left) and Anne McClain work to install adapter plates on new lithium-ion batteries during a spacewalk on March 22, 2019.

Spacewalking Astronauts Swap Space Station Batteries in Power Upgrade

By Hanneke Weitering

The International Space Station got a power upgrade today (March 22) as two NASA astronauts took a spacewalk to install new batteries on the station's solar arrays.

An artist's illustration of SpaceX’s Starship spacecraft separating from its Super Heavy rocket.

SpaceX's Hexagon Tiles for Starship Heat Shield Pass Fiery Test

By Tariq Malik

SpaceX is turning up the heat on its Starship spacecraft project. Literally.

The SIRIUS-19 mock space crew includes (from left to right): Reinhold Povilaitis (USA); Daria Zhidova (Russia); cosmonaut Yevgeny Tarelkin (Russia); Anastasia Stepanova (Russia); Allen Mirkadyrov (USA) and Stephania Fedeye (Russia).

There's a Mock Moon Mission Underway in Russia

By Leonard David

Russia's SIRIUS (Scientific International Research in Unique Terrestrial Station) experiment is now underway, simulating a flight to the moon.

Sagittarius A* (Sgr A*) is a bright bloom of radio waves thought to contain the black hole at the center of the Milky Way. In this x-ray map of the galactic center, researchers discovered two large ‘chimneys’ of plasma leaking out of the Sgr A* region, and seemingly dumping hot matter into two enormous gas bubbles called the Fermi bubbles.

These Two Cosmic 'Chimneys' Could Be Fueling the Galaxy-Sized Bubbles Looming Over the Milky Way

By Brandon Specktor

Scientists made an X-ray map of the center of the galaxy — and they found two chimneys of plasma.

Leo can be found prowling the Spring night skies. This sky map shows Leo over New York at 11 p.m. EDT on March 22, 2019.

Spring Arrives with a Lion in the Night Sky

By Joe Rao

For each season of the year, there is a "keynote" star pattern — and spring brings us to Leo, the Lion.

Alan Eustace during a skydive. The 2016 documentary "14 Minutes from Earth," which just became available on Netflix, documents Eustace's record-setting 2014 jump.

Netflix Premieres Nail-Biting '14 Minutes From Earth,' With Bold Stratospheric Jump

By Elizabeth Howell

The documentary "14 Minutes From Earth," which just premiered on Netflix, shows the secrecy behind, and the excitement following, the highest free-fall jump ever.

Apollo astronauts pose for a portrait at the 2019 Explorers Club Annual Dinner in New York City on March 16, 2019. They are from left to right: Charlie Duke (Apollo 16), Buzz Aldrin (Apollo 11), Walter Cunningham (Apollo 7), Al Worden (Apollo 15), Rusty Schweickart (Apollo 9), Harrison Schmitt (Apollo 17), Michael Collins (Apollo 11) and Fred Haise (Apollo 13)

The Risk of Apollo: Astronauts Swap Harrowing Tales from NASA's Moon Shots

By Chelsea Gohd

Last weekend, a large gathering of Apollo astronauts culminated in a story swap that showcased the risks and dangers of spaceflight.

The Red Bull Air Force took to the skies on March 20, 2019 to celebrate the Supermoon.

Sparks Fly as Skydivers Glide Past a Dazzling Supermoon in Epic Red Bull Stunt!

By Elizabeth Howell

Trailing sparks between their wingsuits, the Red Bull Air Force swept into Los Angeles from above on Thursday (March 20) to celebrate the third and final supermoon of 2019.

The crew of "The Orville" get a glimpse at life in 2015 in the episode "Lasting Impressions."

A Time Capsule Is Recovered and Lt. Malloy Experiences Life in 2015 in 'The Orville' Episode 'Lasting Impressions'

By Scott Snowden

A simple, back-to-basics episode of "The Orville" reminds us that convoluted plots aren't a prerequisite for quality sci-fi.

The two sections of SpaceX's Starship "hopper" test vehicle as seen in December 2018.

You Can Watch SpaceX's Starship Hopper Tests Live Via a South Texas Surf School

By Sarah Lewin

SpaceX's first tests of its prototype Starship may start soon — and you can watch them live online.

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Image of the Day

By Hanneke Weitering

It's a bird! It's a plane! Nope, that's the International Space Station zooming past the moon at an impressive speed of about 5 miles per second.