Who was the astronaut who was the frist human to orbit the Earth?
100
this tool compares color, surface temperature, and absolute brightness of a star
What is the H-R diagram?
100
the belt between the inner and outer planets where rocky objects orbit the sun
What is asteroid belt?
100
seen during a solar eclipse as a thin, red layer surrounding the sun
What is the chromosphere?
100
the rocky center of a comet
What is the nucleus?
200
the first American in space
Who was Alan Shepard?
200
The final stage in the life of a small to a medium sized star
What is a black dwarf?
200
dark matter
What is matter that does not give off electromagnetic radiation so cannot be seen directly? Astronomers think it is approximately 23% of the universe's mass.
200
the incredibly dense layer of the sun
What is the radiation/radiative zone?
200
a huge group of single stars, star systems, star clusters,dust, and gas bound together by gravity?
What is a galaxy?
300
Nicolaus Copernicus
Who was the astronomer who worked out the arrangement of the known planets orbiting the sun in a heliocentric system?
300
the remnants of a supernova explosion
What is a nebula?
300
small icy objects with a solid core that are not considered to be planets.
What are plutoids?
300
the 2 most common elements of the sun?
What is hydrogen and helium?
300
the type of galaxy of the Milky Way
What is a spiral arm galaxy?
400
John Glenn
Who was the first American to orbit the Earth?
400
a star's phase before nuclear fusion begins
What is a protostar?
400
The area where most comets orbit the sun
What is the Kuiper belt?
400
sunspots occur in this layer
What is the photosphere?
400
the force that hypothesized to account for the expansion of the universe
What is dark energy?
500
Neil Armstrong
Who was the first person to walk on the moon?
500
pulsar
What is a spinning neutron star emitting radio waves?
500
young, active galaxies with giant black holes at their center
What are quasars?
500
95 million million km
What is a light year?
500
the highest energy wave on the electromagnetic spectrum?