Houghton Mifflin Science Test Grade 5 Chapter 7
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?
