Top 10 Moon facts

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Moon quiz

What is larger in the sky: the Moon or the Sun? (By apparent size)

Sometimes the Moon, sometimes the Sun. The Moon's orbit is elliptical, and its apparent diameter varies by 10%. This is why both total eclipses (if the Moon is larger) and annular eclipses (if the Sun is larger) happen.

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sky facts

What part of the Moon surface had been known to humanity before the first photos of the dark side were taken in 1959?

59%. Moon's libration changes the angle from which the Moon is seen, allowing about 59% of its surface to be seen from the Earth (but only half at any instant). Moon's libration is caused by the eccentricity of its orbit around Earth and by a slight inclination of its axis of rotation.

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Solar System facts

How long did it take Apollo 11 flight to reach the Moon?

3 days. It took 1 minute of flight to reach Mach 1 and 12 minutes to enter Earth's orbit. After one and a half orbits, the third-stage engine pushed the spacecraft onto its three-day long travel to the Moon.

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Apollo 11 facts

Is the Earth–Moon distance constant?

It slowly increases. Due to the loss of energy caused by tides, the Earth–Moon distance increases at approximately 38 millimetres per year.

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astronomy facts

Which moons are called "Galilean moons"?

Moons of Jupiter. The four largest moons of Jupiter were discovered in 1610 by Galileo Galilei and are today known as the Galilean moons. From the end of the 19th century, dozens of much smaller Jovian moons have been discovered and have received the names of lovers or daughters of the Roman god Jupiter or his Greek equivalent Zeus.

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In which phase is the Moon during the solar eclipse?

New moon. The new moon is the first phase of the Moon, when its orbit is not seen from the Earth; it is at this moment when the Moon and the Sun have the same ecliptical longitude. The Moon is not visible at this time except when it is seen in silhouette during a solar eclipse when it is illuminated by earthshine.

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Solar System facts

Which solar system moon is the only one with a dense atmosphere?

Titan is the largest moon of Saturn. It is the only moon known to have a dense atmosphere, and the only object in space other than Earth where clear evidence of stable bodies of surface liquid has been found.

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space facts

How many people stood on the Moon so far?

Twelve. There have been six manned U.S. landings of the Apollo program (between 1969 and 1972) and numerous unmanned landings, though no soft landings have occurred since 1976.

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NASA facts

What kind of 'natural disasters' happen on the moon?

Moonquakes are produced by tidal forces. Moonquakres are much less common and weaker than earthquakes, although they can last for up to an hour - a significantly longer time than terrestrial earthquakes - because of the absence of water to damp out the seismic vibrations.

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Solar System facts

When was the invisible side of the Moon photographed for the first time?

In 1959, the Soviet Luna spacecraft photographed the invisible side of the Moon, proving that the dark patches on the surface are not seas of liquid, but only areas of fine volcanic dust.

astronomy facts

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