Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.

By signing up, I agree to StudyStack's Terms of Service and Privacy Policy.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.

Remove ads
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards

Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Pershing Astr. 1

Pershing Astr.1

What does a telescope collect from space? electromagnetic radiation
What does the Earth's atmosphere do to gamma rays and x-rays? block them
What is the imaginary sphere that surrounds the Earth? celestial sphere
Name 3 types of electromagnetic radiation found on the spectrum? microwave visible light radio wave
How did Hubble tell the universe was expanding? most of the galaxies were moving away from each other
Why do the scientists put the X-ray telescopes in space? to avoid interference from the Earth's atmosphere
What theory do the observations of red-shift support? that the universe is expanding
What do all the wavelengths of the electromagnetic radiation make up? the whole electromagnetic spectrum
Who showed that planets move in elliptical orbits around the sun? Kepler
Who showed that gravity keeps planets and moons in orbit? Newton
Who was one of the first astronomers to use a telescope to observe objects in space? Galileo
Who proved that there were many galaxies? Hubble
Who created an Earth-centered theory of the universe? Ptolemy
Who created a sun-centered theory of the universe? Copernicus
What is a year? the time it takes for Earth to orbit once around the Sun
What is a day? the time it take Earth to rotate once on its axis
What is altitude? the angle between the object in the sky and the horizon
What is a constellation? a region in the sky with a recognizable star pattern
What is a month? the time it takes for the moon to orbit once around the Earth
What is the horizon? the line where the sky and Earth appear to meet
What is a refracting telescope? an instrument that uses lenses to focus light
Created by: ellist