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Moon

any natural satellite of a planet

rotation

spinning of Earth on its imaginary axis, which takes about 24 hours to complete and causes day and night to occur

Constellations

groups of stars

Universe

everything that exists, including the sun, stars, all the planets, and outer space

Planet

any of the celestial bodies (other than comets or satellites) that revolve around the sun in the solar system

Gravity

the force that pulls objects toward each other

solar system

sun, planets, and all the other objects that revolve around the sun

star

any celestial body visible (as a point of light) from the Earth at night

atmosphere

the envelope of gases surrounding any celestial body

astronauts

a person trained for space flight

meteors

smaller chunks of small matter, that burn up in our atmosphere called shooting stars

comet

A ball of frozen dust and rock that orbits the sun and has a tail that glows

telescope

a device built to observe distant objects by making them appear closer

astronomy

When the Moon has only a small part that is lit, it is called this., the study of the moon, stars, and other objects in space

axis

the center around which something rotates

sun

a typical star that is the source of light and heat for the planets in the solar system

Axis of Rotation

The imaginary line about which a turning body such as the earth rotates

Galaxy

(astronomy) a collection of star systems

Eclipse

An event during which one object in space cases a shadow onto another

Equinox

In an orbit, a position and time in which the sunlight shines equally on the northern and southern hemisphere

Solstice

In an orbit, a position and time during which one hemisphere gets its maximum area of sunlight, while another hemisphere gets its minimum amount of sunlight

Mercury

the smallest planet and the nearest to the sun

Venus

the second nearest planet to the sun

Earth

the 3rd planet from the sun

Mars

the 4th planet from the sun

Jupiter

the largest planet and the 5th from the sun

Saturn

second-largest and sixth planet from the sun

Uranus

seventh planet from the Sun

Neptune

the eighth planet from the Sun

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