1
Molecules, atoms, protons, electrons and photons are all examples of __________.
particles
How long does it take a planet to orbit the sun?
1 year
The earth does _______ around the sun.
loops
What region do scientists think comets are coming from?
The Oort Cloud
Some people call _______ shooting stars.
meteors
What are descriptions below pictures called?
captions
The ____________ from the wind almost knocked me down.
force
Scientists who study the planets and the stars.
Astronomers
A title to a paragraph is called what?
heading
What force connects the solar system to the sun?
gravity
What is the genre of "Visitors From Space"?
Expository Nonfiction
How often do we see Halley's Comet?
Every 76 years
The sign is made of ___________ lights.
fluorescent
On astronomer calls comets "______ ________"
dirty snowballs
What direction does the tail of a comet always point?
Away from the sun
The misty cloud around the nucleus of a comet is called what?
coma
Comets move around the sun in orbits called what?
ellipses
Ancient people thought comets were a sign that a terrible thing was going to happen. Examples
1. ______ 2. ______ 3. ______
war, flood, earthquake
The core of the earth is an example of a __________.
nucleus
The time it takes a comet to complete its orbit is called what?
period
Flying rocks in the solar system are called what?
asteroids
Who is the author of "Visitors From Space"?
Jeanne Bendick
How long ago did the solar system form?
4.5 billion years ago
Comas are made of what?
gas and dust
Created by the outward expansion of a collection of charged particles from the sun's outermost atmosphere.
Solar wind