6.2.7

The Big Bang

Test yourself

The Big Bang

The Big Bang theory says that the universe began from a single point.

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The Big Bang

  • The universe began from a very small region that was hot and dense.
  • This region ‘exploded’ and started expanding.
  • This expansion is still happening.
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Evidence

  • There are many forms of evidence to support the Big Bang model of the universe.
  • An example is the observation of red-shift in distant galaxies.
    • This suggests that the universe has expanded from a single point and continues to expand today.

Gaps in Knowledge

Although science can explain so much of what we see in the universe, there is still a lot we cannot currently explain.

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How expansion happens

  • Scientists still don’t understand everything about the universe.
  • They don’t understand much about how the universe is expanding.
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Dark matter and dark energy

  • Some scientists think that the universe is mostly made up of dark matter (an unknown substance that holds galaxies together but doesn’t emit electromagnetic radiation) and dark energy (the thing that causes the universe to quickly expand).
  • But no one really knows what these are - they are just theories.

Jump to other topics

1Motion, Forces & Energy

1.1Physical Quantities & Measurement Techniques

1.2Motion

1.3Mass & Weight

1.4Density

1.5Forces: Effects of Forces

1.6Forces: Turning Effects of Forces

1.7Forces: Centre of Gravity

1.8Momentum

1.9Energy, Work, & Power: Energy

1.10Energy, Work & Power: Work

1.11Energy, Work & Power: Energy Resources

1.12Energy, Work & Power: Power

1.13Pressure

2Thermal Physics

3Waves

4Electricity & Magnetism

4.1Simple Phenomena of Magnetism

4.2Electrical Quantities: Electric Charge

4.3Electrical Quantities: Electric Current

4.4Electromotive Force & Potential Difference

4.5Electrical Quantities: Resistance

4.6Electrical Energy & Electrical Power

4.7Electric Circuits: Circuit Diagrams & Components

4.8Electric Circuits: Series & Parallel Circuits

4.9Electric Circuits: Action & Use

4.10Electrical Safety

4.11Electromagnetic Effects: Electromagnetic Induction

4.12Electromagnetic Effects: The A.C. Generator

4.13Magnetic Effect of a Current

4.14Force on a Current-Carrying Conductor

4.15Electromagnetic Effects: The D.C. Motor

4.16Electromagnetic Effects: The Transformer

5Nuclear Physics

6Space Physics

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