The World's Biggest Mysteries Scientists Still Can't Solve.

                                                THE UNIVERSE:

A vast region filled up with trillions of celestial objects like galaxies made up of stars, nebula's, planets, gas clusters, dust and comets.

The Hubble Ultra-Deep Field image shows some of the most remote galaxies visible with present technology, each consisting of billions of stars. (Apparent area about 1/79 that of a full moon)

Age (within Lambda-CDM model)	13.799 ± 0.021 billion years
Diameter	Diameter of the observable universe: 8.8×1026 m(28.5 Gpc or 93 Gly)
Mass (ordinary matter)	At least 1053 kg
Average density	4.5 x 10−31 g/cm
Average temperature	2.72548 K
Main contents	Ordinary (barynic) matter (4.9%) Dark matter (26.8%) Dark energy (68.3%)
Shape	Flat with only a 0.4% margin of error[9]

The Expended Universe:

The expanding universe’ investigates the expansion of the Universe

BIG BANG EXPANSION

Abstract:

‘The expanding Universe’ investigates the expansion of the Universe. Hubble's red shift-distance relationship had already been explained by Einstein's general relativity. General relativity identified gravity as a result of curvatures in space-time. Einstein's theory suggests many possible universes, but none of them are static. The Universe is expanding from the Big Bang, and its age is currently estimated at 14bn-years. The mediocrity of the Milky Way is based on a small sample, but increasing this sample allows us to calculate the Hubble Constant. Combining this with the estimated distance of remote supernovae has required the addition of a cosmological constant, which represents dark energy, the driving force behind universal expansion.

THE BIG BANG THEORY