Energy that can travel through space in the form of waves
100
What characteristics are used to classify stars?
Brightness, temperature, size, color, and composition
100
How long a star lives depends on its ____.
mass
100
What are quasars?
Distant, enormously bright objects that look like stars
100
Other ____ have longer wavelengths than visible light.
telescopes
200
What are radio telescopes?
Devices used to detect radio waves in space
200
The brightness of a star depends on both...
its size and temperature
200
All stars begin their lives as parts of a ____, a large cloud of gas and dust, spread out in an immense volume.
nebula
200
A system in which one periodically blocks the light of another star is called an ____.
Eclipsing Binary
200
If you shine white light through a prism, the light spreads out, making different colors and wavelengths. This is called a ____.
spectrum
300
What are observatories and where are they located?
Buildings that contain one or more telescopes. They're usually located on mountaintops or in space.
300
What is the parallax and how do astronomers use it?
The parallax is the apparent change in position when looked at different places. Astronomers use it to measure distance of nearby stars.
300
A contracting cloud, from a nebula, with enough mass to form a star is a ____.
protostar
300
What is a spiral galaxy?
A galaxy that appears to have a bulge in the middle and arms that spiral outward
400
Telescopes are instruments that...
collect and focus light & other forms of electromagnetic radiation
400
What colors and temperatures are in coolest to hottest stars?
Coolest= about 3,200°C, appear reddish
Average= about 5,800°C, appear yellowish
Hottest= over 20,000°C, appear bluish
400
Life of a low- mass star:
1. Nebula
2. Low- mass protostar
3. Low- mass star
4. Red- giant
5. ______
6. White dwarf
7. Black dwarf
Planetary nebula
400
____ look like round, flatten balls, containing billions of stars with little gas and no longer form
Elliptical galaxies
400
A ____ is a device that breaks light into colors and produces an image of the resulting spectrum
spectrograph
500
What is the difference between refracting and reflecting telescopes?
Refracting telescopes have convex lens, or transparent lens. Reflecting telescopes have curved mirrors.
500
What is the difference between apparent and absolute brightness?
The apparent brightness of a star is the brightness we see on Earth. The absolute brightness on a star is the brightness the star would have if it were at a standard distance from Earth.
500
Life of a high- mass star:
1. Nebula
2. High- mass protostar
3. High- mass star
4. Super- giant
5. Supernova
6. Either ____ or a black hole
Neutron star
500
____ do not have a regular shape and appear smaller. They have bright, young stars and lots of gas and dust to form new stars.
Irregular galaxies
500
The United Stated make graphs to find out if the temperature and absolute brightness of a star are related. These graphs are called the _____.