An Astronomical Unit. It is the approximate distance from the earth to the sun.
100
What type of galaxy is the Milky Way?
Spiral.
200
What are galaxies made of?
Gases, dust and stars.
200
What are examples of two different sizes of galaxies?
Supergiants and dwarfs.
200
What shape are the largest galaxies?
Elliptical.
200
Name three measurements that are used in space.
Astronomical Unit (AU), Parsec (PC) and Light Year.
200
True or False? The Milky Way galaxy is believed to be one of the youngest galaxies.
False. It is believed to be older than most.
300
How are galaxies held together?
With gravity.
300
What are two types of formations of stars within galaxies?
Globular clusters and open clusters.
300
True or false? Over half of the galaxies are spiral.
False. Over half of the galaxies are Elliptical.
300
Approximately how far is one AU?
150 million km.
300
Using grains of sand to represent stars, about how many stars can someone see from Earth at night?
About the size of a toothpaste tube.
400
How do galaxies form?
When gravity causes a large spinning cloud of gases, dust and stars.
400
What is one other way galaxies can differ, besides size and star form?
Shape, speed of spin, mass, color and brightness.
400
Which galaxy ranges in shape from a flattened or squished sphere to a circle to a sphere.
Elliptical.
400
Approximately how far is one Parsec?
30.9 trillion kilometres.
400
Who discovered that the Milky Way is not the only galaxy? What was the year?
Edwin Hubble in 1925.
500
True or false. Galaxies are still forming today.
True.
500
What is one characteristic of a globular cluster?
It is composed of as many as 1 million stars and is held together in a distinct, spherical shape.
500
Describe a spiral galaxy with three different characteristics.
Looks like a pinwheel from above, has long "arms" which spiral out from the core, has a glow that surrounds the structure called a halo, looks flat and like a disk from the side.
500
What is the average distance of Mars to the sun.
1.5 AU.
500
Using grains of sand to represent stars, about how many stars are in The Milky Way?