Star Life Cycle
What is the “baby stage” of a star called?
protostar
What kind of waves can we see with our eyes?
visible light
What tool can help scientists see how stars change over time?
HR-Diagram
What do scientists study when they use spectroscopy?
Light from stars or elements
What does the Big Bang Theory explain?
How the universe began
What is the long, middle stage of a star called when it is shining steadily? This is where most stars are.
main sequence
Which waves are used to cook food quickly by exciting water molecules?
microwaves
What is the main area on the diagram where most stars, like the Sun, are found?
main sequence
What can spectroscopy tell us about a star?
its composition (what it is made of)
About how many years ago did the Big Bang happen?
about 13.8 billion years ago
What happens to a star after it runs out of fuel and gets very big?
red giant (or super giant)
Which EM waves give us sunlight and can make our skin burn?
ultraviolet
What does the H-R diagram show about stars?
temperature and brightness
Redshift tells scientists that a star or galaxy is moving which direction?
away from us
What is still moving away from us that shows the universe is expanding?
galaxies
What stage of is when a star explodes (at the end of its life)?
supernova
Which EM waves have the highest frequency and can be the most dangerous to humans?
gamma rays
What does H-R stand for?
Hertzsprung-Russell
Blueshift tells scientists that a star or galaxy is moving which direction?
toward us
What evidence do scientists see in space that supports the Big Bang?
cosmic background radiation (CMB)
What can a supernova leave behind if the star is very big?
Black hole (or neutron star)
Which are felt as heat and used in things like remote controls & night-vision cameras?
infrared waves
What can you predict about a star using the H-R diagram?
its stage in its life cycle
What can redshift help scientists learn about the universe?
the universe is expanding
The Big Bang started as a tiny, hot, and dense… what?
point