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Space Unit Vocab

meteor a streak of light in the sky produced by the burning of a meteoroid in Earth's atmosphere.
asteroid belt any of thousands of dense rocky objects in orbit around the sun between Mars and Jupiter.
comet A ball of ice, dust, and frozen gases that orbits the sun.
revolution the movement of an object around another object.
rotation the spinning motion of a planet on its axis.
outer planets gas giant planets found outside of the asteroid belt.
inner planets terrestrial (earth-like) planets that are dense solids located between the sun and the asteroid belt.
gravity the attractive force between two objects. (The more massive an object, the greater its gravitational force. Example: Earth’s gravity is greater than the gravity of the moon.)
axial tilt the invisible axis that are tilted allowing for seasons to occur.
probe robotic spacecraft that leaves Earth’s orbit and explores space.
satellite any object that revolves around another object in space. Can be artificial or natural like the
Heliocentric Theory Nicolaus Copernicus’ idea that the Earth, planets, and stars all revolved around the Sun.
Geocentric Theory Aristotle & Ptolemy believed that the Earth was the center of the Universe and all objects revolved around it.
tide the rise and fall of sea levels caused by the combined effects of gravitational forces exerted by the Moon.
green house effect is the process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it would be without an atmosphere.
illuminated to light up The moon is illuminated by the sun.
celestial objects Known collectively by astronomers as celestial bodies, astronomical objects, and astronomical bodies, they are the stuff that fills the empty space of the universe.
lunar eclipse occurs when the Earth is between the sun and moon. Sunlight is blocked by the Earth.
solar eclipse occurs during the NEW MOON PHASE when the moon passes between the Sun and Earth, and the moon fully or partially blocks the Sun.
autumn the season between summer and winter known as fall in North America.
equinox Autumnal Equinox = first day of autumn; occurs around the 22nd of September Vernal Equinox = first day of spring; occurs around the 20th of March the time and date when the sun passes directly over the equator; the length of day and night are equal (12 hours each)
solstice Winter Solstice = first day of winter; occurs around the 22nd of December; shortest number of daylight hours, longest night Summer Solstice = first day of summer; occurs around the 21st of June; longest number of daylight hours, shortest night the time and date when the sun is at its greatest distance from the equator; length of day and night show greatest difference
orbit revolve around circle around go around travel around
diameter a straight line passing from side to side through the center of a circle or sphere the measurement from one side of a circle/sphere to the other side as you pass directly through the center. The equator is the diameter of the Earth.
survivable temperatures the highest and lowest temperatures that humans can stand without dying
astronomer the study of celestial objects (stars, galaxies, planets, moons, asteroids, comets and nebulae) and all phenomena that originate outside the atmosphere of Earth
Created by: 4010524