Star
What value represents the brightness of a star as viewed from Earth?
apparent magnitude
The Hertzsprung-Russell diagram is used for classifying
Stars
What is the visible part of the sun?
photosphere
What are large convection cells on the sun’s surface and last from 12-24hrs?
Supergranules
What is the primary factor that determines the brightness of average stars in the main sequence?
temperature
What type of star is cool, small, and dim?
red dwarf
What is the outermost layer of the sun's atmosphere called?
corona
What is the thin layer of the sun's atmosphere that releases ultraviolet radiation ?
transition region
If a right triangle were drawn with the sun, the earth, and a star at the corners, as shown below, which angle would represent the stellar parallax?
angle at the star
What is a group of small, dim stars outside the main sequence?
white dwarfs
Why can the sun's transition region be studied only using space-based solar observations?
It releases ultraviolet radiation
What is a loose asymmetrical clump that contains tens, hundreds or thousands of stars?
Open cluster
What is half the angle that the star appears to move on the celestial sphere when viewed from opposite sides of Earth's orbit ?
stellar parallax
What are the two main characteristics that influence a star's absolute magnitude
temperature and size
What are the dark patch on the sun that is caused by the sun’s magnetic field?
sunspots
What evidence indicates that the sun is spinning?
movement of the sun spots
What is a rapidly rotating neutron star that emits directional beams of radio waves?
pulsar
Which stars are the brightest due to their large size?
giants and supergiants
What type of star group travels outside the boundaries of the Milky Way in an unusual orbit around the Galaxies center?
Globular cluster
What is the distance light travels in one year?
Light year