Oumuamua and Comet Borisov in 2017 and 2019, respectively, created a surge of interest. What were they? Where did they come ...

Tiny spaceships could be accelerated by lasers so that they reach the nearest star in 20 years. That's the theory. Now it's ...

Sailing has been a mainstay of human history for millennia, so it's no surprise that scientists would apply it to traveling ...

Nebulae are gigantic clouds of gas and dust that exist in space between stars. Check out 7 mesmerizing photos of this cosmic phenomenon shared by NASA.

Our space-exploration ambitions have boldly taken humans to the moon, rovers to Mars and spacecraft to the outer reaches of ...

An open letter to any friendly aliens who are considering making first contact with Earth soon: If I've learned anything from ...

But Alpha Centauri is about 4.3 light-years, or 25 trillion miles, from Earth. It would take a spacecraft over 25,000 years—more than 300 lifetimes of an astronomer—to reach it. When ...

Achieving practical interstellar travel requires overcoming the immense challenge of reaching extraordinary velocities. To send a spacecraft, weighing roughly 1,000 kilograms, to a neighboring star ...

"Chemical rockets that we use today, even with the extra speed boost from flying by planets, or from swinging by the sun for a boost, just don't have the ability to scale to useful interstellar speeds ...

"The lightsail will travel faster than any previous spacecraft, with potential to eventually open interstellar distances to ...