According to the Big Bang theory, about 13.8 billion years ago the whole Universe was a very small, extremely hot and dense region. From this tiny point, the whole Universe expanded outwards to what exists today.
Scientists have discovered that red-shift data provides evidence that the Universe, including space itself, is expanding. Astronomers have also discovered a cosmic microwave background radiation (CMBR). This comes from all directions in space and has a temperature of about –270 °C. The CMBR is the remains of the thermal energy from the Big Bang, spread thinly across the whole Universe.
|Prediction from Big Bang theory||Evidence observed||Does evidence support the Big Bang theory?|
|More distant galaxies should move away faster||More distant galaxies have greater red-shift||Yes|
|Initial heat from the Big Bang should now be thinly spread across the whole Universe||CMBR is everywhere at a temperature of about -270°C||Yes|