Week 1 The Universe and its Contents Flashcards
what are the 6 main components of the Universe and define/describe 5 of them
Planets - Small solid or gaseous objects that don’t support fusion
Stars - Large gaseous objects that generate their own energy through nuclear fusion
Nebulae - Clouds of gas and dust that collapse to form new stars
Galaxies - Structures of stars and clouds bound by their mutual gravity
Radiation - Cosmic Microwave Background Radiation
Space - Just space
define brown dwarfs and explain why they are rare
objects on the borderline between stars and planets with mass between 13-80 times that of Jupiter. They can have nuclear fusion using deuterium rather than hydrogen but deuterium is very rare which is why they are rare
what are the six fundamental SI units
metres kilogram second Kelvin Ampere Candela
what is the average power mass for planets
10^25kg
what is the average power mass for Stars
10^30 kg
what is the average power mass for Galaxies
10^40 kg
what is the power mass for the Universe
10^52kg
what are the 3 astronomical distances
Astronomical Units AU
Parsec pc
Lightyear ly
Define astronomical unit
the average distance between the Earth and Sun
what can cause density to change
temperature
