Red Shift and Blue Shift
The difference between a blue shift and red shift.
Blue shift waves are closer and faster, meaning an object is getting closer.
Red shift waves are spread out, meaning an object is getting further.
What does it mean when people say "expanding universe"
it means that it has been growing (becoming bigger) ever since its beginning with the Big Bang. Galaxies outside of our own are moving away from us, and the ones that are farthest away are moving the fastest.
Small galaxies, often containing up to one million stars.
What are irregular galaxies?
Elliptical Galaxies have young stars. True or False
False - Irregular galaxies have young stars.
It is a group of stars, gas and dust held together by gravity.
What is a galaxy?
Do the majority of stars and galaxies exhibit red shift or blue shift? Why?
The majority of stars and galaxies exhibit red shift, because they are moving away from Earth.
Characterized by all galaxies drifting apart, eventually slowing down and stopping.
What is the Big Chill?
The largest type of galaxy, created when galaxies collide
What is an elliptical galaxy?
Name the three types of galaxies
Spiral, elliptical, irregular
A rounded structure in the centers of some galaxies, composed primarily of old stars, and having some gas and dust.
What is a bulge?
What is the purpose of red shift
To gauge distances
Characterized by all matter condensing back into one singularity.
What is the Big Crunch?
A mid-sized galaxy with 100-200 billion stars.
What is a spiral galaxy?
Doesn't have spiral arms. (there are two)
What are elliptical and irregular galaxies?
A hypothetical form of matter thought to account for approximately 85% of the matter in the universe
What is dark matter?
If an object moves __________, the light moves to the red end of the spectrum, as its wavelengths get longer.
What is away?
What started to form when the big bang was 1 second old?
protons and neutrons
A galaxy that has a chaotic appearance , large clouds of gas and dust, and no spiral arms.
What is irregular?
Name two main features of a spiral galaxy
A central bulge and spiral arms.
Long , pin-wheel arms that consist of young, bright stars
What are spiral arms?
What does it mean if light in a galaxy gets more blue?
The galaxy is getting closer
Another name for the big chill.
What is the big freeze?
A galaxy that is round out elliptical in outline. It contains little has and dust, no disk or spiral arms, a few hot bright stars.
What is elliptical?
Name two main differences between spiral and elliptical galaxies
They have different shapes
Elliptical galaxies are older and contain less gas and dust than spiral galaxies.
A change in wave frequency as an object emitting a wave moves toward or away from an observer
What is the Doppler Effect?