Star life cycle
what is the cloud of gas and dust where stars are born.
nebula
This measures how bright a star is.
Luminosity
what type of galaxy is the milkyway?
Spiral
Which theory describes how the universe began.
Big bang theory
Which star will have the shortest lifespan?
A. Red dwarf
B. Yellow star
C. Blue giant
D. White dwarf
C. Blue giant
What is the longest stage in a star’s life.
Main Sequence
On the H-R diagram, temperature increases from ___ to ____
right to left
This galaxy type contains mostly older stars and has a football shape
Elliptical
Galaxies moving away from each other provide evidence that the universe is _______
Expanding
What type of star is our Sun?
Average star
A low-mass star becomes this after the red giant stage.
White dwarf
A star that is very hot but dim is placed in what category on the HR diagram?
White dwarf
irregular
Shifting in light that shows galaxies are moving away is call the _____
Red shift
What is measured on the x-axis of an HR diagram and
what is measure on the y-axis?
X= Temperature
Y= Luminosity
What is the life cycle of a star like the sun?
Nebula, Average star, Red giant, Planetary nebula, White dwarf
Cool and very bright stars are found in this region.
red giants/supergiants?
Which galaxies produce a lot of new stars
Spiral and irregular
What is the leftover radiation that supports the Big Bang theory.
Cosmic microwave background radiation
What is the life cycle of a star like the sun
Nebula, Average star, Red giant, Planetary nebula, White dwarf
How would a star much bigger than our sun end its life?
Why is a blue supergiant more likely to become a supernova than a red dwarf?
Because it has much greater mass.
What part of the milky way is Earth located?
Orion arm
The strongest single piece of evidence for the Big Bang theory is....
Cosmic microwave background radiation
Why does red shift alone not fully prove the Big Bang theory?
→ Because it shows expansion, but not the origin; additional evidence like CMB is needed.