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 ...

But what time is it on the moon? Back in April ... "For something traveling at the speed of light, 56 microseconds is enough time to travel the distance of approximately 168 football fields ...

For nearly 40 years, scientists have generally agreed that Earth's Moon formed from debris after a massive collision with our ...

But what time is it on the moon? Back in April ... "For something traveling at the speed of light, 56 microseconds is enough time to travel the distance of approximately 168 football fields ...

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 ...

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.

Everyone knows the name of the first man on the moon, but what about the last ... The initial slow ascent turned into a sudden vault of speed, and we were away. The sides of the rocket were ...

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 ...