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Who are these guys
How long does it take
How far can you see with that thing
Vocabulary
The expanding universe
100
Kepler
What is Showed that planets move in an elliptical orbit around the sun
100
Month
What is roughly the time required for the mon to orbit once around the Earth
100
refracting telescope
What is An instrument that uses a set of lenses to focus light
100
Altitude
What is The angle between an object in the sky and the horizon
100
He discovered that the universe is expanding
What is Edwin Hubble
200
Galileo
What is Was one of the first astronomers to use a telescope to observe objects in space.
200
A Day
What is the time required for the Earth to rotate on its axis
200
telescope
What is an instrument that collects electromagnetic radiation from the sky and concentrates it for better observation
200
Horizon
What is The line where the sky and the Earth appear to meet
200
Redshift
What is if a light source is moving quickly away from an observer
300
Copernicus
What is Created a sun-centered theory of the universe
300
a year
What is The time required for the Earth to orbit once around the sun
300
reflecting telescope
What is a telescope that uses a curved mirror to gather and focus light from distant objects
300
Constellation
What is a region of the sky that contains a recognizable star pattern
300
Blueshift
What is if a light source is moving quickly toward an observer
400
Hubble
What is Proved there were many galaxies
400
9.46 trillion kilometers
What is What is the distance that light travels in one year
400
Hubble telescope
What is This telescope was sent out into deep space in 1990 but had a flaw in its mirror which had to be fixed.
400
Zenith
What is an imaginary point directly above an observer's head
400
Celestial sphere
What is Using this imaginary sphere, astronomers can accurately describe the location of an object or star
500
Newton
What is showed that gravity keeps planets and moons in orbit
500
1 million
What is How many Earth's fit into our sun
500
Nonoptical telescopes
What is Scientist use this type of telescope to study invisible radiation
500
Celestial equator
What is an imaginary circle created by extending Earth's equator into space
500
Circumpolar stars
What is stars that can been seen at all times of year and all times of night