Science worksheets for class 10
Access printable science worksheets for class 10
Galaxies are colossal collections of stars, gas & dust held together by _____.
space/time
gravity
black holes
dark matter
Younger stars that orbit the galactic bulge are located in the
Halo regions.
galactic disk.
galactic bulge.
density waves.
The area of the galaxy that has the most dense stars surrounding a supermassive black hole.
Halo region
galactic bulge
galactic disk
spiral density arms
The area where faint, old stars exists that surrounds the disk & bulge.
Halo region
galactic bulge
galactic disk
spiral density regions
Globular clusters exist in this region just outside of the galaxy.
Halo region
galactic bulge
galactic disk
spiral density regions
Our Sun and solar system are located
near the edge of the Milky Way.
about 2/3 from the center of the Milky Way.
near the middle of the Milky Way.
near the galactic bulge.
The ancient Greeks named the Milky Way after comparing it to
a Greek god.
the candy bar.
a milky white river.
an ancient galaxy that existed a long time ago.
The Milky Way measures ____ light years in length.
26,000
1 million
1000
100 thousand
The Milky Way only measures about ____ light years in thickness.
100
100,000
1000
1 million
Figuring out what the Milky Way looks like is difficult because
we live outside of it.
it is impossible to send a space probe that far.
we live inside of it.
it is full of dark matter.
The Milky Way galaxy is thought to be a(n)
spiral galaxy
barred spiral galaxy.
elliptical galaxy.
irregular galaxy.
Our Sun and solar system lies within the ____ arm of the Milky Way galaxy.
Cygnus
Perseus
Sagittarius
Orion
Variable stars are stars that fluctuate in
size.
magnetic field strength.
temperature.
brightness.
Astronomers use the period-luminosity of variable stars to help
determine the age of our galaxy.
determine galactic distances.
determine the size of our galaxy.
discover supernovae.
These type of clusters with variable stars orbit the Milky Way and other galaxies.
open clusters
closed clusters
globular clusters
stellar associations
Variable stars include short period RR Lyrae & longer period Cepheids.
True
False
Stars that are located in the galactic disk move
in mostly random orbits.
in retrograde orbits.
in mostly stable or orderly orbits.
around less massive black holes.
Stars that are located in the Halo regions of the galaxy orbit
in random or disorderly motions.
around black holes.
in stable or orderly motions.
in binary systems.
The Sun takes about ____ million years to orbit the galaxy once (or a galactic year).
100
225
300
425
Halo stars are very young and most likely formed before the Milky Way took shape.
True
False
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