Ole Rømer was able to measure the speed of light by observing eclipses of Jupiter's moon Io. When Jupiter was closer to Earth, Rømer noted that eclipses of Io occurred slightly earlier than when ...

Although they travel at the fastest possible speed (the speed of light,) they ... Its average distance is about 240,000 miles, so light from the Moon takes (240,000 miles divided by 186.000 ...

Coordinated Lunar Time will help with precise space-travel calculations. But first, NASA has to figure out how to make it ...

The speed of light was the same no matter its direction ... Black is the way shadows on the moon looked to the Apollo astronauts, because the moon has no atmosphere and thus no sky to bounce ...

NASA astronauts will land in an eerie place. Unlike the Apollo missions of over 50 years ago, which touched down near the lunar equator, the space agency's new moon endeavor will land in the south ...

The Moon does not make its own light like a star ... It's mass and the speed it hits the surface at also make a difference.

These preliminary images from a new suite of sensitive, high-speed, visible-light and ... The viewer in the moon’s shadow sees scattered light from the sun’s surface that hits all of the ...

In 1969, Apollo 11 astronaut Neil Armstrong stepped onto the moon's surface—a momentous engineering and science feat marked ...

The European Space Agency (ESA) aims to facilitate lunar exploration with its Moonlight programme to put satellites into ...