09/22/14 Flashcards
1
Q
The HR diagram shows the relationship between a stars surface temperature and its
A
absolute diagram
2
Q
what are the 3 major types of galaxies identified by edwin hubble
A
spiral, elliptical, and irregular galxies
3
Q
the universe is organized according to….
A
a loosely arranged structure
4
Q
what do the pattern of lines in a star’s absorption spectrum represent?
A
a star’s color
5
Q
why do scientists study distant galaxies to learn about early galaxies?
A
because it takes a long time for light to travel through space
6
Q
scientists think that the milky way probably is a
A
spiral galaxy
7
Q
according to the big bang theory the universe is how old?
A
13.7 billion years old
8
Q
what is one way scientists use to calculate the age of the universe?
A
measure the distance from earth to various galaxies
