An object in the sky that sends out its own light, generated by nuclear reactions in its center. There are many billions of stars in our galaxy, the Milky Way. Note: Our own sun is a medium-sized star.
Also called major planet. any of the eight large heavenly bodies revolving about the sun and shining by reflected light: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, or Neptune, in the order of their proximity to the sun
the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun
the movement or path of the earth or a heavenly body turning on its axis. one complete turn of such a body.
the orbiting of one heavenly body around another. a single course of such movement.
a large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space
the totality of known or supposed objects and phenomena throughout space; the cosmos
phases of the moon
the particular appearance presented by the moon at a given time: new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning crescent, 3rd quarter, waning gibbous
the sun together with all the planets and other bodies that revolve around it.
the great circle of the earth that is equidistant from the North Pole and South Pole.
a natural body that revolves around a planet; a moon
the earth's natural satellite, orbiting the earth at a mean distance of 238,857 miles (384,393 km) and having a diameter of 2160 miles (3476 km).
any of various groups of stars to which definite names have been given, such as Ursa Major, Ursa Minor, Boötes, Cancer, Orion
an optical instrument for making distant objects appear larger and therefore nearer
Relative size measure in is a way of expressing the size of an item where the relative size of an item is compared to other items.
Relative order is a way of expressing the order of an item compared to other items in a group
the line about which a rotating body, such as the earth, turns
the force of attraction by which terrestrial bodies tend to fall toward the center of the earth.
the distance traversed by light in one mean solar year, about 5.88 trillion mi. (9.46 trillion km): used as a unit in measuring stellar distances
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