Tanya Lewis

Taxes are going to play a big role in a Mars mission, both in getting there and upon arrival, one expert says.

Martian astronauts will need to be able to withstand the reduced gravity and increased radiation in deep space. And they'll have to find a way to deal with the boredom, experts say.

A debate has long raged among scientists over the possible existence of life on Mars, and a new study is adding fuel to the fire.

World-famous astrophysicist Stephen Hawking took to Facebook yesterday (Nov. 18) to share his views about a new film based on his life.

The origins of organic matter found by Mars lander missions have long been debated, but a new study suggests a way to find out whether these chemicals of life came from the Red Planet or elsewhere.

Astronauts paid a virtual visit to former President Bill Clinton today from the International Space Station, sharing their perspectives on Earth from orbit.

Addressing climate change is not only crucial for preserving the environment, it also makes good economic sense, some politicians and business leaders say.

Robots built by students from around the world will face off in a competition designed to test how well these wheeled explorers might one day get around on the surface of Mars.

Astronaut candidates have to undergo a psychological evaluation to determine if they have what it takes to fly on a NASA mission. How does the agency choose people with the right stuff?

A student-led mission aims to send a time capsule to the Red Planet, using a new, more compact kind of propulsion system.

Commercial space race frontrunner SpaceX brought its new manned Dragon capsule to the Washington, D.C. this week to showcase the futuristic spaceship.

Leading scientists, artists and thinkers from around the world will convene here this week for the World Science Festival, and you can watch the talks live in a webcast.

The Earth rises spectacularly as a tiny blue dot above the moon in a new photo that hints at the vastness of space and the fragility of humanity.

When astronauts spend long periods of time in space, their hearts become more spherical and lose muscle mass, a new study finds, which could lead to cardiac problems.

Long-distance atmospheric connections between the North and South poles are linking weather and climate in distant parts of the globe, according to data from a NASA spacecraft.