Cosmology Flashcards
How old is the Universe?
around 13/13.8 billion years
What is the big bang theory?
A theory on the begging of the universe and how it started
Two things to support the big bang theory?
That the universe is still expanding and cosmic microwave background radiation(CMB) and the abunce of lught elements hydrogen and helium
Definition of stars?
balls of burning gas
Definition of solar system?
Planets that orbit a star
Definition of planets?
a celestial body moving in an elliptical orbit round a star.
!!! Definition of a moon?
A natural object orbiting a planet
Definition of galaxy?
Lagre cluster of stars
Definition of the milky way?
The galaxy that our solar system is in
Definition of exoplanet?
A planet which is not found in our solar system. Orbits another star
Definition of black hole?
A place where the laws of physics no longer work and light can’t escape the gravitiational pull.
Definition of observable universe?
The observable universe is a spherical region of the Universe comprising all matter and
empty space that may be observed from Earth at the present time.
Definition of hubble deep field/deep space?
Image of the galaxies seen in a dark patch of sky between the glalaxies and stars that are visible form earth.
What is a light year?
The distance light travels in a year
How to detect exoplanets using light curves?
Point the telescope at stars and track how much If a planet went infron of the star, on the light graph there would be a dip, the larger the planet the bigger the dip.
How to calculate one light year?
v=3= 3 x 10x8 ms
-1
t=1 year
vxt
9.47x10x15
Uses of line spectra?
Find out what elements the stars contain.
To figure out how far away from us it is.
What are the two types of telescopes?
Optical telescope and refracting telescope
What is the main part of the telescope called/
The body
What is the lens at the end called
Objective lens
What is the end closest to you called?
Eye piece
What are the two types of spectra?
Line spectra and continuous spectra.
Advatage of using a large objective lens?
Collects more light which makes the image sharper
What is a contiuous spectrum?
A compete spectrum with alll the colours.
