SOLAR SYSTEM

Detailed explanation-1: -Measurements made by NASA’s WMAP spacecraft have shown that the universe is 13.7 billion years old, plus or minus about 130, 000 years.

Detailed explanation-2: -The universe is (nearly) 14 billion years old, astronomers confirm. With looming discrepancies about the true age of the universe, scientists have taken a fresh look at the observable (expanding) universe and have estimated that it is 13.77 billion years old (plus or minus 40 million years).

Detailed explanation-3: -We can trace the history of our universe back about 14 billion years, to a fiery period known as the Big Bang. At that time, the universe was extremely hot and dense. In fact, all the matter we observe today-out to the furthest galaxies we can see-was packed into a space smaller than a grapefruit.

Detailed explanation-4: -Astronomers estimate the age of the universe in two ways: 1) by looking for the oldest stars; and 2) by measuring the rate of expansion of the universe and extrapolating back to the Big Bang; just as crime detectives can trace the origin of a bullet from the holes in a wall.

Detailed explanation-5: -The Lambda-CDM concordance model describes the evolution of the universe from a very uniform, hot, dense primordial state to its present state over a span of about 13.77 billion years of cosmological time.

Detailed explanation-6: -Scientists’ best estimate is that the universe is about 13.8 billion years old. But, like so many of the largest-scale properties of the universe, we are not entirely sure about its age.

Detailed explanation-7: -From cosmic inflation until today’s dark energy domination, the broad strokes of our entire cosmic history is known. After over a century of debate over the age of the Universe, including a period of decades where many argued that the Universe was infinitely old, we finally know its age: 13.8 billion years.