Earth and Space Chapter 25.4
small, icy body that orbits the sun
What is a comet?
space dust and rock that enter earth's atmosphere but burn up before reaching the surface
What is a meteor?
meteors with parts that hit earth
What is a meteorite?
space dust and rock before they enter Earth's atmosphere
What is a meteoroid?
orbits a star, small enough that it isn't a star, spherical, clears it's orbit
What is the definition of a planet?
when their orbit brings them close to the sun
When are comets visible from earth?
the Kuiper Belt or the Oort Cloud
Where do comets come from?
between mars and jupiter
Where is the asteroid belt located?
Makemake
Which of the following is classified as a dwarf planet? a.) Hydra b.) Charon c.) Dysnomia d.) MakeMake
it's pushed by the particles of the sun
Why does the tail of a comet always point away from the sun?
Kuiper Belt
Short period comets come from the _____________
F
T or F? A total of about 5000 asteroids have been discovered
T
T or F? Astronomers think there may be many undiscovered dwarf planets in our solar system
F
T or F? Ceres is a dwarf planet located in the Kuiper Belt
T
T or F? Eris was once considered to be the tenth planet in the solar system
T
T or F? Meteors range from the size of boulders down to the size of grains of sand
F
T or F? Most asteroids are geologically active
T
T or F? Most meteors burn up in the atmosphere
F
T or F? Scientists think that the asteroid belt formed more recently than the rest of the solar system
T
T or F? The Kuiper Belt contains comets, asteroids, and dwarf planets
T
T or F? asteroid impacts are linked to mass extinctions in Earth's past
meteor shower
A ____________ occur when Earth passes through a cluster of meteoroids
gravity
An asteroid has ________________
near-earth
Asteroids with orbits that cross Earth's orbit are called __________ asteroids.
Kuiper Belt
Comets that reappear every 200 years or less originate in a region of the solar system called the __________
asteroid
Earth's moon is thought to have originated from Earth when the planet was struck by a large ________
they get close to the sun, ice melts, and the vapors form a tail that reflects light
How are comets tails formed?
Oort Cloud
Long period comets come from the _______________
asteroids, comet tails, mars
Possible origins of meteors include ______, _______, and _________
Eris
The largest known dwarf planet in the solar system is named __________
period
The time between one appearance of a comet and the next is called the comet's _________
comets
Water may have been brought to early Earth when it collided with ________
Oort Cloud
comets with periods of thousands or millions of years originate in a region of the solar system called the ___________
asteroid belt
most of the asteroids in the solar system are found between Mars and Jupiter in a band called the __________
Hydra
one of pluto's moons
Ceres
one of the solar system's dwarf planets
comet
small icy, object with a very elliptical orbit around the sun
meteor
small piece of rock burning up as it passes through Earth's atmosphere
asteroid
very small, rocky body that orbits the sun
meteorite
what a meteor is called after it lands on earth
meteoroid
what a meteor is called before it enters Earth's atmosphere
gravitational pull
what can cause asteroids to leave the belt?
small, rocky body that orbits the sun
what is an asteroid?
contains thousands of asteroids
what is the asteroid belt?
