Physics 8.2.2

Question 1

When did the Universe Start, and What did it Start From?

Answer 1

The Universe Started Around 14 Billion Years Ago, From a Very Small Region, that was Extremely Dense & Hot.

Question 2

What Caused the ‘Big Bang’?

Answer 2

A Series of Explosions.

Question 3

What Caused the Universe to Expand, According to the ‘Big Bang Theory’?

Answer 3

The Big Bang.

Question 4

Explain the ‘Big Bang Theory’: (6)

Answer 4

-Around 14 Billion Years Ago, in a very Small, Dense & Hot Region, there was a Series of Explosions.

-This is Called the ‘Big Bang’.

-The Region was Overloaded with Energy, so it Started to Expand, to Form the Expanding Universe.

-As the Universe Expands, it Cools Down, Losing Energy as it Expands.

-Each Point, or Body / Object, in the Universe Expands Away Relatively From Each other.

-As a Result of the Initial Explosions, the Big Bang, the Universe Continues to Expand.

Question 5

What is the Evidence for the Big Bang Theory?

Answer 5

By Observing the Lines on the Visible Light EM Spectrum of Supernovae in Other Galaxies, there is Evidence to Suggest that Distant Galaxies are Receding (Moving Further Apart), Ever Faster.
The Lines on the Visible Light EM Spectrum are Shifting Towards the Red. This is Red Shift, which Means that the Wave-Emitting Body / Object is Moving Away; Wavelength Increases, Frequency Decreases (Remember Police Sirens).

Question 6

The Galaxies that are Moving the Fastest are ___ to Us.

Answer 6

Furthest.

Question 7

The Galaxies that are Moving the Slowest are ___ to Us.

Answer 7

Closest.