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How was the universe formed?
By a large explosion
When was the universe created?
Scientists estimate that it was created 13.8 billion years ago
What is the unit of astronomical distances?
Light-year
How many Sun-like objects are there in the Milky Way?
200 to 300 billion
What does Light-year refer to?
It refers to the distance that light travels in 1 year
The radius of Milky Way is about how many light years?
100 thousand light-years
What is the basic unit composing the universe?
The galaxy
The Milky Way is one of the what in the universe?
Numerous galaxies
The Solar System is one of the what in the Milky Way?
Planetary system
The Earth is one of the what in the Solar System?
Astronomical Object
Tell me about the characteristics of a Star.
- illuminating - emitting heat
Tell me the characteristics of a Planet.
- Non-illuminating - revolving around a star
Tell me the charateristics of a Satellite.
- non illuminating - revolving around a planet
Astronomical objects can be classified into what 3 types?
Stars, Planets, Satellites
Give an example of a Star.
Sun (or other appropiate answers)
Give an example of a Planet.
Earth (or other appropiate answers)
