moon
38 questions tagged moon — spanning every one of the seven Ws.
Why is the Moon so bright?
The Moon makes no light of its own; it reflects sunlight, and it looks bright only because the night sky is so dark.
When did a spacecraft first land softly on the Moon?
The Soviet probe Luna 9 made the first soft landing on the Moon on 3 February 1966 and sent back the first photos from the lunar surface.
Why does the Moon show phases during the month?
The Moon’s phases happen because we see different portions of its sunlit half as it orbits Earth. A full cycle takes about 29.5 days.
Why are there footprints on the Moon that can last for a very long time?
The Moon has no atmosphere, wind, or liquid water to erode footprints, so they can persist for millions of years unless disturbed by impacts.
When was the first successful spacecraft launched to the Moon?
Luna 2 reached the Moon on 13 September 1959. It became the first human-made object to impact the lunar surface.
When was the first soft landing on the Moon?
Luna 9 made the first soft landing on 3 February 1966. It was the first spacecraft to survive landing and send images from the Moon’s surface.
When was the first spacecraft to return samples from the Moon?
Luna 16 returned lunar samples to Earth on 24 September 1970. It was the first robotic sample-return mission from the Moon.
When was the first spacecraft to orbit the Moon?
Lunar Orbiter 1 became the first U.S. spacecraft to orbit the Moon on 14 August 1966. It helped map landing sites for Apollo missions.
When was the first spacecraft to orbit the Moon launched?
Lunar Orbiter 1 launched in 1966 and became the first American spacecraft to orbit the Moon.
When was the first spacecraft to land on the Moon?
In 1966, Luna 9 became the first spacecraft to make a soft landing on the Moon.
When was the first sample returned from the Moon?
Luna 16 returned the first robotic lunar samples to Earth in 1970.
Whose spacecraft first photographed the far side of the Moon?
The Soviet Luna 3 mission photographed the Moon’s far side in 1959. Those images revealed terrain never seen from Earth.
Whose mission first photographed the far side of the Moon?
The Soviet spacecraft Luna 3 took the first photographs of the Moon’s far side in October 1959. It was the first time humans had seen that hidden hemisphere.
Whose mission first landed softly on the Moon?
The Soviet Union’s Luna 9 achieved the first soft landing on the Moon on 3 February 1966. It survived the landing and sent back surface images.
Whose mission first found water ice at the Moon’s south pole?
NASA’s LCROSS mission announced water ice in the Moon’s south polar region in 2009. The impact experiment detected water in the ejecta plume.
Whose measurements helped reveal that the Moon was not a perfect sphere?
Galileo Galilei’s telescopic drawings showed mountains and craters on the Moon in 1609–1610. This contradicted the old idea of a flawless heavenly sphere.
Why does the Moon slowly move away from Earth?
Tidal interactions transfer Earth’s rotational energy to the Moon’s orbit, pushing the Moon outward by about 3.8 cm each year.
Why is the far side of the Moon so different from the side we see?
The Moon is tidally locked, and its far side has a thicker crust and far fewer dark lava plains than the near side.
Why is the far side of the Moon so different from the near side?
The Moon’s far side has a much thicker crust and far fewer lava plains, likely because of early thermal differences and the way the Moon cooled and was shaped by Earth’s gravity.
What is the lunar south pole?
The lunar south pole is the region near the Moon’s southern axis where sunlight is low and some craters stay permanently shadowed. These dark areas may contain water ice.
What is tidal locking?
Tidal locking is when a moon or planet rotates once in the same time it orbits, so the same side always faces its partner.
Where on the Moon did Apollo 11 land?
Apollo 11 landed in the Sea of Tranquility, a lunar mare on the Moon’s near side. The touchdown occurred on 20 July 1969.
Where is the lunar far side located relative to Earth?
The lunar far side is the hemisphere of the Moon that always faces away from Earth. It is not the same as the Moon’s dark side, because it still gets sunlight.
Where is Shackleton Crater on the Moon?
Shackleton Crater is near the Moon’s south pole. Its rim stays in near-constant sunlight, while its interior is permanently shadowed.
Whose observations of Jupiter first revealed that the planet has four major moons?
Those observations were made by Galileo Galilei in 1610. He identified Io, Europa, Ganymede, and Callisto, now known as the Galilean moons.
Whose spacecraft was the first to photograph the far side of the Moon?
That was the Soviet Luna 3 mission in 1959. It returned the first images of the Moon’s far side, which had never been seen directly before.
Whose observation first showed that the Moon's surface is covered in mountains and craters, not a perfect smooth sphere?
That was Galileo Galilei, using his telescope in 1609. His sketches revealed the Moon as a rugged world with shadows, mountains, and craters.
Whose mission first detected water ice in permanent shadowed craters on the Moon?
That evidence came from multiple missions, but a key early result was from NASA's Lunar Prospector in 1998. It found strong signs of hydrogen at the lunar poles, supporting the presence of water ice.
Why does the Moon show the same face to Earth?
Because the Moon is tidally locked: it rotates once on its axis in about 27.3 days, the same time it takes to orbit Earth.
Why does the far side of the Moon have more craters than the near side?
The far side has a thicker crust and fewer large lava plains, so many more ancient impact craters are preserved there.
Why are there craters on the Moon but not many on Earth?
Earth erases many old craters with weather, erosion, plate tectonics, and oceans, while the Moon has almost no atmosphere or active surface recycling.
When was the first image of the far side of the Moon taken by a spacecraft?
The first pictures of the Moon’s far side were taken in 1959 by the Soviet Luna 3 spacecraft.
When was the first meteoroid impact observed on the Moon by a spacecraft?
The first deliberate impact on the Moon was on 4 March 1959, when the Soviet Luna 2 struck the lunar surface. It was not a meteoroid, but it was the first human-made object to hit the Moon.
Where is the Earth’s Moon moving farthest from Earth?
The Moon reaches its farthest distance at apogee, while its closest point is perigee. These points occur along its elliptical orbit around Earth.
Where is the Oceanus Procellarum found?
Oceanus Procellarum is on the Moon, on the near side visible from Earth. It is the largest of the lunar maria.
Whose observations first showed that the Moon has a cratered surface like a world, not a perfect sphere?
Galileo Galilei made the key telescopic lunar observations in 1609 and 1610. He saw mountains, valleys and craters on the Moon.
Whose observations first showed that the Moon is not a smooth perfect sphere?
Galileo Galilei showed in 1609–1610 that the Moon has mountains, valleys and craters. His telescopic observations contradicted the old idea of a flawless celestial sphere.
Whose spacecraft first observed the far side of the Moon?
The Soviet Luna 3 spacecraft took the first pictures of the Moon’s far side in 1959. Those images revealed a very different lunar terrain from the side seen from Earth.