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Physics S3 > Cosmology > Flashcards

Cosmology Flashcards

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1
Q

How old is the Universe?

A

around 13/13.8 billion years

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2
Q

What is the big bang theory?

A

A theory on the begging of the universe and how it started

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3
Q

Two things to support the big bang theory?

A

That the universe is still expanding and cosmic microwave background radiation(CMB) and the abunce of lught elements hydrogen and helium

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4
Q

Definition of stars?

A

balls of burning gas

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5
Q

Definition of solar system?

A

Planets that orbit a star

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6
Q

Definition of planets?

A

a celestial body moving in an elliptical orbit round a star.

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7
Q

!!! Definition of a moon?

A

A natural object orbiting a planet

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8
Q

Definition of galaxy?

A

Lagre cluster of stars

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9
Q

Definition of the milky way?

A

The galaxy that our solar system is in

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10
Q

Definition of exoplanet?

A

A planet which is not found in our solar system. Orbits another star

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11
Q

Definition of black hole?

A

A place where the laws of physics no longer work and light can’t escape the gravitiational pull.

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12
Q

Definition of observable universe?

A

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.

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13
Q

Definition of hubble deep field/deep space?

A

Image of the galaxies seen in a dark patch of sky between the glalaxies and stars that are visible form earth.

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14
Q

What is a light year?

A

The distance light travels in a year

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15
Q

How to detect exoplanets using light curves?

A

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.

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16
Q

How to calculate one light year?

A

v=3= 3 x 10x8 ms
-1
t=1 year
vxt
9.47x10x15

17
Q

Uses of line spectra?

A

Find out what elements the stars contain.
To figure out how far away from us it is.

18
Q

What are the two types of telescopes?

A

Optical telescope and refracting telescope

19
Q

What is the main part of the telescope called/

A

The body

20
Q

What is the lens at the end called

A

Objective lens

21
Q

What is the end closest to you called?

A

Eye piece

22
Q

What are the two types of spectra?

A

Line spectra and continuous spectra.

23
Q

Advatage of using a large objective lens?

A

Collects more light which makes the image sharper

24
Q

What is a contiuous spectrum?

A

A compete spectrum with alll the colours.

Physics S3 (4 decks)

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