Stars
What colors of stars would indicate that it has a high temperature?
White and blue.
What type of galaxy is the milky way?
spiral
Define: absolute magnitude
the brightness of a star as seen from earth
What kind of star is one that expands and cools once it loses all of its hydrogen.
Red Giant
What are the two main elements present in most stars?
hydrogen and helium
Name the 3 types of galaxies
Spiral, elliptical, irregular
Aristotle believed which of the four elements was the heaviest. Why was this important to geocentrism?
He believed Earth to be the heaviest. Therefore it must be at the center of the 'universe'
What is 'an apparent shift in the position of an object when viewed from different locations'
parallax
What is the difference between cosmology and astronomy?
Cosmology studies the formation of the universe, astronomy studies objects in the universe.
We can observe what elements are present in stars using a?
spectrograph with emission lines
What two kinds of clusters are usually present in galaxies?
Globular and open clusters
Who is considered the father of heliocentrism?
Nicolaus Copernicus
What diagram related the surface temperature and absolute magnitude of a star?
HR Diagram
What evidence do we have for the universe spreading?
cosmic background radiation
What is a neutron star?
A star that has collapsed under gravity to the point that electrons and protons have fused to form neutrons.
What are quasars?
a luminous, starlike object that generates energy at a high rate. These are thought to be the most distant objects in a galaxy.
What allowed Galileo to confirm Copernicus' theory of heliocentrism?
By using a telescope to discover moons and visualize the orbits of the planets.
What is the location on the HR Diagram where most stars are?
Main Sequence
What is the difference between apparent and actual motion of stars?
One is how it appears from Earth, the other is its actual place in space.
How do astronomers typically detect the presence of black holes?
X-Rays.
When gas or dust from a star spirals into a black hole, it gives off xrays.
Why would observing far away objects help scientists investigate the early universe?
because light travels at a certain speed, we can determine how far the universe has spread over time.
Galileo first invented the lens for what purpose?
Military spying.
___________: a small, hot, dim star that is the leftover center of an old star.
White Dwarf
This is Ms. G's favorite color
pink