Stars. Nebula – massive cloud of dust and gas in the universe. Nebulas are; Star nurseries Star graveyards. Measurement of distance in space. Light – year – distance that travels in one year 287,000m/sec – speed of light 1 ltyr = 6 trillion miles
amt. of light produced by a star
Apparent magnitude –
measure of amt of light received by the earth
1. size of star
2. temperature of star
3. distance of star
Antares magnitude? is a red giant. Is this star hot or cool? Explain.
cool; red shows cooler temps from an expected surface area.
What is the absolute magnitude of the sun?
What conditions do the H-R chart show between stars?
absoulte magnitude, temperature, size
Which star is a dwarf
Which star is a supergiant?
Which star is like the sun?
A Black Hole is a region of space where the gravitational force is so strong that not even light can escape from it.
- temps 2million K
- gives off solar wind