astro stuffs

Question 1

what is luminosity?

Answer 1

the total power output of the star

Question 2

what is absolute magnitude?

Answer 2

measure how bright a star is if placed at the same distance from earth

Question 3

what is apparent magnitude?

Answer 3

measure how bright a star is seen from earth

Question 4

what does the brightness of the star depend on ?

Answer 4

• distance
• power

Question 5

what is time period?

Answer 5

the time it takes to complete 1 revolution ( 2 pie r )

Question 6

what is the doppler effect?

Answer 6

the change in frequency or wavelength when there’s a relative motion between the source and the observer

Question 7

what is the lifecycle of a small star?

Answer 7

nebular - protostar - main sequence star - red giant - white dwarf - black dwarf

Question 8

what is the lifecycle of a big star?

Answer 8

nebulsr - protostar - main sequence star - red super giant - supernova > black hole > neutron star

Question 9

what is supernova?

Answer 9

a star that suddenly explodes and becomes very bright

Question 10

what is light year?

Answer 10

unit of distance travelled by the light in a year

Question 11

cmbr formula?

Answer 11

wavelength / 3x 10^8

Question 12

how is cmbr proof?

Answer 12

it apprears the same everywhere which indicates that all parts of the universe were intact long ago