Astronomy Unit 1: Our Sky

Identify the number 2,000,000,000 in scientific notation.

• 2.0 x 100^-9

• 2.0 x 10⁹

• 2.0 x 10^-9

• 2.0 x 100⁹

How do you say 2 x 10⁷

^{(Choose two)}

• "two multiply ten seven"

• "two hundred ten and seven"

• "two times ten to the power of seven:

• "two to the seventh power"

This is the temperature that water freezes.

• Fahrenheit (°F)

• 32

• Kelvin (K)

• 273

• Celsius (°C)

• 0

This is the temperature that water boils.

• Celsius (°C)

• 373

• Kelvin (K)

• 100

• Fahrenheit (°F)

• 212

Match the following

• Distance between the Sun and Earth

• astronomical unit (AU)

• Distance light can go in one year

• sidereal year (y)

• One orbit of the Earth around the sun

• light-year (ly)

• All molecular motion stops

• absolute zero

The Big Dipper is an example of a/an...

• asterism

• constellation

• celestial sphere

• astrological star sign

The point directly over your head when you look at the stars is called the...

• North Star

• Horizon

• Zenith

• Nadir

The sun follows an imaginary line across the sky that's called the...

• Horizon

• Celestial Equator

• equator

• Ecliptic

You're on Yushan (玉山). You see a star low on the eastern horizon directly east.
Where will the star be in 6 hours?

• high in the Northern sky

• high in the Eastern sky

• high in the Southern sky

• directly overhead

This diagram illustrates...

• Ptolemy's Geocentric Model

• Copernicus's Heliocentric Model

• Retrograde Motion

• the law of gravity