Vocabulary Vocabulary Vocabulary Vocabulary Guide! Guide! Guide! Guide!

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Comets and Comets and Comets and Comets and Asteroids Up-close Asteroids Up-close Asteroids Up-close Asteroids Up-close

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Ceres: Dwarf planet Ceres is the Ceres: Dwarf planet Ceres is the Ceres: Dwarf planet Ceres is the Ceres: Dwarf planet Ceres is the largest object in the asteroid belt largest object in the asteroid belt largest object in the asteroid belt largest object in the asteroid belt between Mars and Jupiter and the only between Mars and Jupiter and the only between Mars and Jupiter and the only between Mars and Jupiter and the only dwarf planet located in the inner solar dwarf planet located in the inner solar dwarf planet located in the inner solar dwarf planet located in the inner solar system. It was the first member of the system. It was the first member of the system. It was the first member of the system. It was the first member of the asteroid belt to be discovered when asteroid belt to be discovered when asteroid belt to be discovered when asteroid belt to be discovered when Giuseppe Piazzi spotted it in 1801. Giuseppe Piazzi spotted it in 1801. Giuseppe Piazzi spotted it in 1801. Giuseppe Piazzi spotted it in 1801.

Dinosaur: one of many reptiles that Dinosaur: one of many reptiles that Dinosaur: one of many reptiles that Dinosaur: one of many reptiles that lived on Earth millions of years ago lived on Earth millions of years ago lived on Earth millions of years ago lived on Earth millions of years ago

Envision: to think of (something that Envision: to think of (something that Envision: to think of (something that Envision: to think of (something that you believe might exist or happen in you believe might exist or happen in you believe might exist or happen in you believe might exist or happen in the future) : to picture (something) in the future) : to picture (something) in the future) : to picture (something) in the future) : to picture (something) in your mind your mind your mind your mind

Impact: the act or force of one thing Impact: the act or force of one thing Impact: the act or force of one thing Impact: the act or force of one thing hitting another hitting another hitting another hitting another

Kuiper Belt: a disc-shaped region Kuiper Belt: a disc-shaped region Kuiper Belt: a disc-shaped region Kuiper Belt: a disc-shaped region beyond Neptune. This distant region is beyond Neptune. This distant region is beyond Neptune. This distant region is beyond Neptune. This distant region is probably populated with hundreds of probably populated with hundreds of probably populated with hundreds of probably populated with hundreds of thousands of icy bodies larger than 100 thousands of icy bodies larger than 100 thousands of icy bodies larger than 100 thousands of icy bodies larger than 100 km across and an estimated trillion km across and an estimated trillion km across and an estimated trillion km across and an estimated trillion comets. comets. comets. comets.

Oort Cloud: is believed to be a thick Oort Cloud: is believed to be a thick Oort Cloud: is believed to be a thick Oort Cloud: is believed to be a thick bubble of icy debris that surrounds our bubble of icy debris that surrounds our bubble of icy debris that surrounds our bubble of icy debris that surrounds our solar system. This distant cloud may solar system. This distant cloud may solar system. This distant cloud may solar system. This distant cloud may extend a third of the way from our sun extend a third of the way from our sun extend a third of the way from our sun extend a third of the way from our sun to the next star. to the next star. to the next star. to the next star.

Hurtle: to move or fall with great Hurtle: to move or fall with great Hurtle: to move or fall with great Hurtle: to move or fall with great speed and force speed and force speed and force speed and force

Remnants: the part of something that Remnants: the part of something that Remnants: the part of something that Remnants: the part of something that is left when the other parts are gone is left when the other parts are gone is left when the other parts are gone is left when the other parts are gone

Spherical: having the shape of a Spherical: having the shape of a Spherical: having the shape of a Spherical: having the shape of a sphere sphere sphere sphere

Torus: a surface or solid formed by Torus: a surface or solid formed by Torus: a surface or solid formed by Torus: a surface or solid formed by rotating a closed curve, especially a rotating a closed curve, especially a rotating a closed curve, especially a rotating a closed curve, especially a circle, around a line that lies in the circle, around a line that lies in the circle, around a line that lies in the circle, around a line that lies in the same plane but does not intersect it same plane but does not intersect it same plane but does not intersect it same plane but does not intersect it (e.g., like a ring-shaped doughnut) (e.g., like a ring-shaped doughnut) (e.g., like a ring-shaped doughnut) (e.g., like a ring-shaped doughnut)

Vesta: is the second most massive Vesta: is the second most massive Vesta: is the second most massive Vesta: is the second most massive asteroid in the main belt between Mars asteroid in the main belt between Mars asteroid in the main belt between Mars asteroid in the main belt between Mars and Jupiter. The giant asteroid is almost and Jupiter. The giant asteroid is almost and Jupiter. The giant asteroid is almost and Jupiter. The giant asteroid is almost spherical, and is nearly a dwarf planet. spherical, and is nearly a dwarf planet. spherical, and is nearly a dwarf planet. spherical, and is nearly a dwarf planet.

Definitions are cited from Merriam- Definitions are cited from Merriam- Definitions are cited from Merriam- Definitions are cited from Merriam- Webster’s Learners Dictionary or nasa.gov Webster’s Learners Dictionary or nasa.gov Webster’s Learners Dictionary or nasa.gov Webster’s Learners Dictionary or nasa.gov