Big Bang Theory

Strengths

• The universe is expanding
• Our universe is not static
• Cosmic background radiation
• Temperature 'echo'
• Most distant galaxies consist primarily of primordial

Weaknesses

• Does not explain what caused the universe to come into existence
• Has a 'horizon problem'
• According to the theory the universe should be half matter and
• half anti-matter but it is not

Opportunities

• Further expansion of the universe
• New matter still being created

Threats

• Other origin explanations could threaten accuracy
• e.g. steady state theory

Summary

• The Big Bang happened 13.7 billion years ago
• The universe started to expand from one spot
• Space and time were created in the Big Bang
• All the planets and stars are moving away from each other
• As the universe expanded more matter was created