Science 5 Flashcards
(17 cards)
What is the importance of constellations?
It gives us time (hour and season), navigation
What is a spectroscope?
Something that measures the spectrum of light and also measures temperature, composition, and energy
What is Parallax
measures distances to stars
Apparent vs absolute magnitude
Apparent is a negative scale, distance is variable
Absolute magnitude = luminosity
Nuclear fission vs. fusion
2 hydrogen become 1 Helium
Layers of the Sun
3 interior are core, radiative zone, and the convection zone
3 exterior photosphere, chromosphere, and the corona
Solar “weather”
Sun spots, Solar flares, Solar prominence, Coronal mass ejection, Solar wind
HR diagram
It is backward so the hotter stars are usually blue and brighter, while cooler stars are red and less bright
Nebula
where stars are born
How are stars born?
Stars are born from a bunch of dust and gas, which eventually collapses due to gravity.
Main sequence
Fusing H to He
Low/med
H to He, He to C - giant to white dwarf
high mass
H to He, He to C, a few more rounds of
fusion/collapse/expansion, then iron
supergiants, neutron star or black hole
Dark matter and energy
Doesn’t reflect or emit light; explains extra gravity
Dominant force pushing galaxies apart
Big bang theory
Expansion and cooling
Had to wait for it cool so atoms could form, then stars, then galaxies
Big Bang Theory Evidence
Doppler shift/Redshift - all stars moving away from all other stars
CMB - cosmic background radiation
Abundance of H and He
What is a low mass star’s life cycle?
core collapses to a white dwarf
outer layers expand to form a planetary nebula
