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



If the solar system is reduced by the factor of 10 billion and the Sun is a size of a grapefruit, th Earth will be a size of ________. A tip of a ballpoint pen
Iin a 1:10 billion scale, a distance to the Andromeda Galaxy is similar to a_________. A trip across the United States.
What is a solar system? An area where materials, including planets and moons, revolve around a star.
How the universe was born? Big Bang
If the universe is put into a cosmic calendar, we, humans, would be born in...... December 31st (11:59:95)
What si a star? A large ball of heat and gas that gives off energy from nuclear fusion.
What is a planet? A moderately large object that revolves around a star (the Sun) and reflects light.
What types of composition can planets have? Rocky, icy, or gaseous
What is a galaxy? An island of stars that is put together by gravity and orbits a common center.
What is the universe? The sum of all matter and energy; everything between galaxies.
What two elements did the early universe has? Hydrogen and helium
How are we, humans, and Earth made from "star stuff"? Humans and the planet are made from heavier elements from other past stars
The farther we look back at a faraway galaxies, The farther we look back in time (It would appear younger).
Why can't we see a galaxy 15 light years away, learning that the universe is 14 billion years old? Looking at the galaxy means looking back in time before the universe existed.
How would it take to count the number of stars in our universe? A few thousand years
In our cosmic calendar, when did the dinosaurs appear? December 26th
When did the dinosaurs die in the cosmic calendar? December 30th
Created by: U0105006