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A spacecraft is a vehicle, or machine designed to fly in outer space. Spacecraft are used for a variety of purposes, including communications, earth observation, meteorology, navigation, space colonization, planetary exploration, and transportation of humans and cargo.
On a sub-orbital spaceflight, a spacecraft enters space and then returns to the surface, without having gone into an orbit. For orbital spaceflights, spacecraft enter closed orbits around the Earth or around other celestial bodies. Spacecraft used for human spaceflight carry people on board as crew or passengers from start or on orbit (space stations) only.

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A black hole, like a huge bottomless hole, has a big denity it has a lot of gravity, and it can take all the objects and gas and light around it. It was formed by the collapse of gravity when the massive star was running out of fuel and dying

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The sun is very big also is very hot, in the solar system planets, comets, including dust is moves round the sun, quality as the X1030 1.989 kilograms, the sun is a huge star, 1.392 million km in diameter, the sun's surface is a layer of hot gas, so it is difficult to close to the sun.

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A star is a celestial object visible to the naked eye. The activity of the energy inside the stars causes the stars to become irregular in shape.
The planet itself does not shine, we see the light of its reflected sun.

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It is the earth's only natural satellite and is the fifth largest satellite in the solar system. The diameter of the moon is a quarter of the earth, the quality is one over eighty of the earth, surrounded by a relative to the planets, it is one of the largest satellite, the quality is also high density within the solar system's second satellite, second only to the IO. The lunar surface is covered with craters formed by meteorite impacts. The moon is now about 30 times the earth's diameter.
The moon is the first alien planet that has ever landed on earth. The Soviet union's moon program launched the first unmanned spacecraft to the moon in 1959. NASA's Apollo program is the only manned mission to the moon so far.

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A comet is a distinctive appearance of a cloud that changes in the brightness and shape of the solar system and varies from day to day. The comet is divided into three parts: nucleus, coma and tail. The nucleus is made of ice, and when the comet is close to the star, the comet's material sublimates, forming a hazy coma around the ice core and a tail of a thin material flow. Because of the pressure of the solar wind, the tail always points away from the sun to form a long tail. The tail is usually tens of millions of kilometers long and up to several hundred million kilometers long. The comet is shaped like a broom, so it is known as a jinx. The orbit of a comet is mostly a parabola or a hyperbola, a small number of ellipses. More than 1,700 comets have been found orbiting the sun.