Observing the Sky
Formation of the solar system
Planets, moons, meteor, comets
100
Horizon
What is the line where the sky and Earth appear to meet?
100
Planetesimals
What are the building blocks of planets?
100
Average distance between Earth and the sun.
What is an astronomical unit?
200
Copernicus
Who developed the heliocentric idea?
200
Dark, cool areas on the sun.
What are sunspots?
200
Jupiter
Which planet is the largest?
300
Constellation
What is a picture outlined by stars?
300
Cloud of gas and dust where planets and stars form.
What are nebulas?
400
Circumpolar Star
What is a star that can be seen all year and at all times of night?
400
Hydrogen atoms combine to form helium atoms
What is nuclear fusion?
500
Astronomy
What is the study of all physical objects beyond Earth?
500
Visible layer of the sun?
What is the photosphere?
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