NASA / Am a zing Spa c e C la s s r o o m A c tivity
Answer Key to Student Activity Sheet A
NOT E : This chart presents a complete comparison of the three types of galaxies. The Galaxy Trading
Cards do not provide all of the information contained in this chart. Students may need to search the student
readings to find the information.
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NASA / Am a zing Spa c e C la s s r o o m A c tivity
Answer Key to Student Activity Sheet B
N OT E: This chart presents a complete comparison of the three types of galaxies. The Galaxy Trading
Cards do not provide all of the information contained in this chart. Students may need to search the
student readings to find the information.
Venn Diagram: Comparison of Spiral and Elliptical Galaxies
F&# Explain why irregular galaxies are not part of this comparison.
6/ Irregular galaxies don’t have a predictable shape or structure.
F'# What features of irregular galaxies are also common to both spiral and elliptical galaxies?
6/ Like spirals and ellipticals, irregular galaxies are huge. They contain stars, gas, and dust
— all held together by gravity. They have a halo (but don’t always have a bulge).
F(# What features of irregular galaxies are common to either spiral galaxies or elliptical gal-
axies (but not both)? (In each case, identify the feature and the type of galaxy that irregulars
resemble.)
6/ Irregular galaxies are similar to spiral galaxies in two respects: they are usually rich in
gas and dust and they have both young and old stars.
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