Lecture One Flashcards
0
Q
What are the three requirements to be a planet?
A
1 orbits the sun
2 enough mass to be round
3 cleared the neighbourhood around its orbit
1
Q
What is our cosmic address?
A
Universe, local supercluster, local group, Milky Way, solar system, Earth
2
Q
What is a moon or satellite
A
A celestial body orbiting another body
3
Q
How many planets and moons in our solar system?
A
8 planets, 172 moons of planets
4
Q
I was Pluto kicked out of the club
A
New objects were found outside of Pluto that were larger than Pluto
5
Q
What is the sun?
A
A ball of hot Hydrogen gas, that generates heat and light by nuclear fusion
6
Q
The milky way is…
A
A spiral galaxy – about a 100 billion stars, orbiting a supermassive black hole
7
Q
Age of the universe?
A
13.7 billion years
