Cosmology for Edexcel GCSE Physics

This page covers the following topics:

1. Steady state theory

The Steady State theory states that the Universe has always existed and it is expanding. It also states that while the Universe expands, it creates new matter constantly. The red-shifted light from distant galaxies supports this idea, as it supports the fact that the Universe is expanding. However, scientists stopped using this theory when CMBR was discovered. This is because CMBR indicates that the Universe had a starting point, which does not support the Steady State theory.

1

Describe why CMBR does not support the Steady State theory.

CMBR indicates that the Universe had a starting point, which does not support the Steady State theory.

2

Explain the difference between the Steady State and Big Bang theory.

The Big Bang theory states that the Universe started from a tiny, dense region of extremely high temperatures, whereas the Steady State theory states that the Universe has always existed.

3

How does redshift provide evidence for the Steady State theory?

It implies that the Universe is expanding, as the distant galaxies are moving away, and therefore supports the Steady State theory.

4

State the Steady State theory.

The Steady State theory states that the Universe has always existed, and it is expanding and creating new matter.

5

Why is the Steady State theory not used today?

Scientists stopped using the Steady State theory when CMBR was discovered, since this suggests that the Universe had a starting point, unlike what the Steady State theory states.

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