Thursday 19th Aug Flashcards
1
Q
How old is the universe?
A
13.8 billion years old
2
Q
How many stars are there in the universe?
A
at least 100 billion stars
3
Q
What is the diameter of the universe?
A
100 000 - 200 000 light years
4
Q
How many galaxies are there in the universe?
A
100 billion
5
Q
How fast does light travel?
A
9.5 x 10^12 km in one year
6
Q
What does our solar system contain?
A
Everything bound to its gravity
7
Q
What is beyond our solar system?
A
Thousands of planetary systems orbiting other stars in the Milky Way
