Science

It once took thousands of American engineers decades to get something into space. Now Relativity Space says its 3D printers can make a rocket in as little as two months. With a first launch planned for 2022, NBC News’ Jacob Ward speaks with CEO Tim Ellis about cutting down on the cost of space travel and his dream of bringing people to Mars.

Atmospheric ozone absorbs ultraviolet light coming from the sun. Its absence means more of this high-energy radiation reaches Earth, where it can harm living cells.

A new study of handprints found in Tibet theorizes that they could be the earliest work of art ever found. Some experts are skeptical.

The four-person crew will now spend three days in orbit around Earth before re-entering the atmosphere and splashing down in the Atlantic Ocean.

The three-day expedition will be the first mission to space without any professional astronauts on board.

The four non-professional astronauts trained for six months ahead of the launch, and will orbit Earth for three days. SpaceX founder Elon Musk believes spaceflight will one day be routine, like airline travel.

"It's absolutely appalling to see an attack on nature of this scale," Sea Shepherd Global CEO Alex Cornelissen said.

In some countries, the number of people "very concerned" about the personal impact of climate change more than doubled. In the U.S., it's flat.

Studying unusual asteroids can reveal clues about the solar system — and this is one of the most unusual.

The migration would be largely within countries where rising sea levels, water scarcity and declining crop productivity would lead to stress on cities and urban centers areas.

Take a tour of a mouse's anatomy, marvel at hundreds of thousands of neurons and more amazing views through the lens of a microscope.