Houghton Mifflin Science Test Grade 5 Chapter 7

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4.6 Billion years old

How old is the sun?

Meteoroid

A bit of rock or metal that orbits the sun.

Meteor

A chunk of matter that enters Earth's atmosphere and is heated by friction with the air.

Sunspot

A dark-appearing area on the sun that is cooler than surrounding areas.

Galaxy

A huge system of gas, dust, and stars.

Planet

A large body that revolves around the sun.

Asteroid

A relatively small, rocky object that orbits the sun.

Comet

A small, orbiting body made of dust, ice, and frozen gases.

Inner planet

Any of the first four planets (Mercury, Venus, Earth, and Mars) from the Sun.

Outer planet

Any of the planets farthest from the sun (Jupiter, Saturn, Uranus, and Neptune).

Earth

People used to think that which planet was the center of the solar system?

Solar System

The Sun and all the bodies that travel, or revolve, around it.

Mars and Jupiter

The asteroid belt is in between which two planets?

Gravity

The gravitational attraction of earth, or any massive body in space, on objects at or near its surface.

Nuclear Fusion

The process in which the nuclei of atoms fuse together to form a larger nucleus.

Mass and distance

The strength of gravity on an object depends on which two things?

The Milky Way

What galaxy is the solar system in?

Jupiter

What is the biggest planet in the solar system?

Saturn

What is the least dense of all the planets?

The heliocentric model

What is the model called that says that the sun is in the center of the solar system?

The inner planets

What orbits faster around the sun? The inner planets or the outer planets?

Hydrogen and Helium

What two gases make up the sun?

The asteroid belt

Where are most asteroids located?

Copernicus

Who discovered that the sun was the center of the solar system?

Galileo

Who was the first person to use a telescope?


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