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Astronomy Unit Tran

Astronomy Vocabulary and Question

QuestionAnswer
What is astronomy? The study of the moon, stars, and other objects in space..
What is an axis? An imaginary straight line on which an object rotates.
What is rotation? When an object spins it is said to be rotating.
What is a revolution? When something is moving in a circle around another object such as the way the Moon Circles the Earth it is said to revolve around that object.
What is an orbit? The path one object takes around another.
What is a tilt? To cause to lean, incline, slope, or slant.
What is solstice? 22 June, and 22 December. Time of the year when the day is either shortest, or longest depending on where you are.
What is a equinox? March 21st, and September 22nd. Twice a year, when the day and night are the same amount of time all around the world.
What is a phase? The apparent change in the shape of the Moon, Mercury, and Venus due to how much of the sunlit side is facing the Earth.
What is an eclipse? When our view of one object in the sky is blocked by either another object, or the Earths shadow.
What is gravity? The force of attraction by which terrestrial bodies tend to fall toward the center of the earth.
What is a tide? The periodic rise and fall of the waters of the ocean and its inlets, produced by the attraction of the moon and sun, and occurring about every 12 hours.
What is a satellite? A small object orbiting a larger one. There are many electronic objects that orbit the Earth.
What is a telescope? An optical instrument for making distant objects appear larger and therefore nearer.
What is geocentric? Simply means the Earth in the Center. People used to believe the Universe was geocentric, or that the Earth was in the center of the Universe.
What is heliocentric? Measured or considered as being seen from the center of the sun.
What is an inner planet? Any of the four planets closest to the sun: Mercury, Venus, the earth, or Mars.
What is an outer planet? Any of the five planets with orbits outside the orbit of Mars: Jupiter, Saturn, Uranus, Neptune, and Pluto.
What is a comet? A celestial body moving about the sun, usually in a highly eccentric orbit, consisting of a central mass surrounded by an envelope of dust and gas that may form a tail that streams away from the sun.
What is an asteroid? A rock, or Minor Planet orbiting the Sun.
What is a meteoroid? Any small object in Outer Space, such as dust, or a rock.
What is a constellation? A grouping of stars which have been given names by ancient astronomers because of the way they look.
Whats is a galaxy? A group of stars, gas and dust held together by gravity.
What is an universe? The totality of known or supposed objects and phenomena throughout space; the cosmos; macrocosm.
What is the Milky Way? Our Galaxy. (the word "Galaxy" actually means milky way in Greek).
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