Nebula - A cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter., Galaxy - A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction., Planet - A celestial body moving in an elliptical orbit round a star., Mercury - The closest planet to the Sun in our solar system, Venus - The hottest planet in our solar system, Astrolabe - An instrument used to make astronomical measurements, typically of the altitudes of celestial bodies, and in navigation for calculating latitude, before the development of the sextant., Black Hole - A region of space having a gravitational field so intense that no matter or radiation can escape., Asteroid - A small rocky body orbiting the sun. Large numbers of these, ranging enormously in size, are found between the orbits of Mars and Jupiter, though some have more eccentric orbits., Satellite - A celestial or artificially placed body in orbit round the earth or moon or another planet in order to collect information or for communication.,

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