The Universe

The Universe

By Akram Varqid

Milkyway : Our Galaxy

Type of Galaxies

Diameter approximately 100 000 light years

Distance between object increasing as space is expanding

Because of big bang

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Galaxy is a combination of stars

When object goes away from earth, the light is pulled away.

The wavelength become longer, so originally blue light become redder​

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Redshift

Can be determined by how much redshift happening. The more redshift, the further wavelength is pulled, the faster the object going away

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Distance of far object

It is very bright, so it can be seen from earth.

The brightness can be used to determine the distance from earth​

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Supernova Explosion

Calculating distance

Hubble Constant

H₀ = v / D

​v is the speed of object going away from earth

D is the distance from earth​

Roughly determined as​

H₀ = 2.2 x 10^-18 s^-1

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Multiple Choice

Hubble Constant is

• H₀ = 2.2 x 10¹⁸ s^-1

• H₀ = 2.2 x 10^-18 s^-1

Multiple Choice

Age of universe can be determined by

• v/d

• d/v

Age of universe

Estimated to be determined by

d / v = 1 / H₀

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This shows that all object come from a single point​

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Multiple Choice

Milkyway is galaxy type

• Spiral

• Elliptical

• Irregular

Multiple Choice

Each bright point in galaxy represents a

• Planet

• Moon

• Star

• Comet

Multiple Choice

Redshift is the phenomena when planet moves

• Towards us

• Away from us

Multiple Choice

The faster the object go from us it become

• More redshift

• Less redshift

Multiple Choice

The brighter supernova of a star in a galaxy, the galaxy is

• Further from us

• Closer to us