Falling Stars
Have you ever seen a falling star?
What does space garbage consist of?
Pieces of different things humans have sent into space.
How many stars are in the Milky Way?
More than 200 billion.
What are the chances of finding life on another planet?
Quite good!
A rock.
How many pieces of space garbage are floating around the Earth?
Well over 1 million.
How old is the Milky Way?
More than 13 billion years.
How many stars are there in the universe?
200 billion billion.
Why do some rocks hit the Earth?
Because they are bigger than others.
What happens when some garbage comes back down to Earth?
It becomes very hot and burns up in the air.
Who gave the Milky Way its name?
The Greeks.
What is the name of the man who calculated the odds of finding life on another planet?
Frank Drake.
Why is it hard to see falling stars?
Because of light pollution from cities.
How can we get rid of space garbage?
There is no easy way.
What did Galileo use in 1610 to look at the Milky Way?
A telescope.
If only 1/1000000 of the stars in the universe each have one planet, how many planets are there?
200 trillion
(200 000 000 000 000)
Why can we see many falling stars on some nights and not on others?
Because on these nights, the Earth is passing through the tail of a comet.
Why hasn't much garbage come down to Earth?
Because most of it is too far away.
How many planets and moons are in the Milky Way?
Billions.
If there is life on 1/100 of the 200 trillion stars with planets, how many planets have life?
2 trillion.
(2 000 000 000 000)