Karl Tate

The European Space Agency's ExoMars project involves an orbiter, lander and rover, launched on two separate Proton rockets.

The British company Reaction Engines Ltd. hopes to manufacture Skylon, a runway-to-orbit space plane using hybrid air-breathing rocket engines.

XCOR aims to take paying passengers on a suborbital weightless hop to the edge of space.

DARE is a proposed lunar satellite that would study the early era of the universe when the stars first starting turning on.

Mini-Neptunes outnumber other types of planets found by astronomers.

Chart details the causes of the destruction of Challenger on Jan. 28, 1986.

Researchers say an anomaly in the orbits of distant Kuiper Belt objects points to the existence of an unknown planet orbiting the sun.

How is a supernova different from a hypernova? Learn about the different types of exploding stars that astronomers have identified.

Ridley Scott's new space film showcases a lot of space hardware derived from actual NASA plans for interplanetary travel.

Here is a chart of some of the must-see spectacles that the night sky has to offer in 2016.

Planned in the 1960s but never realized, the Gemini-based manned spy satellite was finally declassified in 2015.

A planet close to its parent star is hot like Venus, but rotates quickly and could have a substantial atmosphere.

Spoiler Alert! Here's the complicated math problems Mark Watney has to solve in order to survive in "The Martian."

Since 2004, the Cassini space probe has orbited Saturn, collecting photos and data that have revolutionized our understanding of the planet and its moons.

Astronomers group stars into classes according to spectral color and brightness.

Are we the only intelligent life in the universe? Here's how we intend to find out.

Astronomers have developed some clever methods of detecting tiny planets orbiting distant stars.

Is time travel possible? Are the past and future set or can they be changed? Sci-fi books and films have long explored these ideas.

In the film "The Martian" (2015), an astronaut played by Matt Damon has to improvise when his crew leaves him behind by accident. Here's a look at what Watney would need to stay alive on Mars.

After decades of speculation, scientists now know for sure that liquid, salty water flows on the surface of Mars. See what the discovery means in our infographic.

A series of four total lunar eclipses in a row is called a tetrad, or four Blood Moons. See how lunar eclipse tetrads work in this Space.com infographic.

Learn what makes a big full moon a true 'supermoon' in this SPACE.com infographic.

Daredevil sungrazing comets risk annihilation every time they skim the surface of our star. Here's how the Solar and Heliospheric Observatory tracks these comet interlopers.

Amazon founder Jeff Bezos leads Blue Origin, a commercial aerospace firm that hopes to send people on suborbital and orbital space trips.