Oval-shaped, like a flattened circle
A representation of how something looks or works
A small piece of rock or metal that travels in space around the sun
A bright streak of light that passes through Earth's atmosphere
A ball of ice, dust, and gases that travels through space and orbits the sun
The distance light travels in one year
Stars that appear to be in groups when viewed from Earth
A group of billions of stars, dust, and gases in space held together by gravity
An instrument that separates light into a pattern of lines or different colors
The bending of light as it passes from one material to another; a way to gather and focus light
The process performed by a mirror when it bounces of light off a shiny surface; a way to gather and focus light
What did Ptolemy's model show?
The sun and planets revolved around Earth
Why do some planets seem to shine brighter than stars?
They are closer to Earth than any star except the sun
How do planets shine?
They reflect light from the sun
What are Meteoroids formed from?
Asteroids or comets
What effect does the moon's gravity have on Earth?
It causes the ocean's tides
The instruments that can record images from telescopes by changing radiation into electrical charges
The clear glass piece in telescopes that focuses and refracts light rays
A tool used to make distant objects appear closer and clearer
How do scientists group stars?
By their size, brightness, and color
What parts of a telescope help to focus light and magnify images?
Lens and mirrors
The air around Earth that often blurs images as light passes through it
What unit of measurement do scientists use to measure distances to the stars?
A light year
The sun, planets and their moons, along with other objects that revolve around the sun
A rocky object that revolves around the sun
Why is Earth affected more by the sun than by any other space object?
The sun provides the heat and light necessary for life.
In what way are asteroids and comets like the planets?
They orbit the sun