Astronomy Unit Vocabulary Flashcards
Luminosity, objective, constant distance temperature & size determine the brightness of a star.
absolute magnitude
How bright an object looks from Earth, photometer measure, Hipparchus scale
apparent magnitude
microwave radiation that is a remnant of the big bang
background radiation
A theory for the end of the universe. The universe will expand so much that it will separate and not be able to continue forming since everything is separated. More widely accepted/proven theory.
Big chill
the theory for the end of universe that says universe will collapse back into a singularity.
big crunch
the name given to the mysterious force that’s causing the rate of expansion of our universe to accelerate over time, rather than to slow down.
dark energy
New moon and full moon cause maximum tide heights.
spring tide
1st quarter and 3rd quarter moons that create 90 degree angles cause minimum tide heights.
neap tides.
time between high and low tide. water level is decreasing
ebb tides
a type of figure that is similar to a circle but has two foci instead of one focus. an orbit takes this path.
ellipse
a planet that orbits a star that is not the sun
exoplanet
when the sea level is increasing.
flood tides
high tide- max height
ebb tides- decreasing
low tides- min. height
flood tides- increasing
ok
a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction. might include other heavenly bodies.
galaxy
when water levels reach their highest
high tide
nuclear fusion balances pressure with gravity
Hydrostatic equilibrium