Earth and Space Chapter 25.4

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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?


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