Test 2 Extra Flashcards
What are the three upper layers of the Sun?
- Photosphere.
- Chromosphere.
- Corona.
The dark patches observed in the Sun’s photosphere are called:
sun spots
Observations of binary stars allow astronomers to measure what about the stars?
The masses of the stars.
A binary star system in which one star passes in front of its companion and blocks its light out is called:
an eclipsing binary
A light curve plots which two quantities?
Time and apparent magnitude.
Suppose that a star has a parallax of 1/10 arcseconds, how far away is that star?
10 parsecs.
The number of sunspots observed on the Sun varies with a period of approximately:
11 years
How hot is the center of the Sun?
15 million Kelvin.
What mechanism is the dominate one for heat transport in the radiative zone?
Radiation.
What are three things caused by solar flares?
- Coronal mass ejections.
- Auroras.
- Satellite communication disruption.
Which spectral type of star has the hottest surface temperature?
Type O
How does the mass of the Sun compare to the average mass of stars?
It has average mass.
The first person to measure the distance to a star was:
Willheim Bessel
The distance to the Sun is:
93 million miles.
The surface temperature of the Sun is:
5800 Kelvin
