around 4.54 billion years ago
Earth formed around 4.54 billion years ago, approximately one-third the age of the universe, by accretion from the solar nebula. Volcanic outgassing probably created the primordial atmosphere and then the ocean, but the early atmosphere contained almost no oxygen.

The Milky Way achieved its present form about 10 billion years ago when it merged with a smaller, neighbouring galaxy, new observations and modelling show.

Stars like our Sun burn for about nine or 10 billion years. So our Sun is about halfway through its life. But don’t worry. It still has about 5,000,000,000—five billion—years to go.

about 10 billion years old
And it is very hot, with an average temperature of 3,140 degrees Fahrenheit. This super-earth is about 10 billion years old, making it one of the oldest rocky planets ever to be discovered.

approximately 10-43 seconds
Planck Epoch (or Planck Era), from zero to approximately 10-43 seconds (1 Planck Time): This is the closest that current physics can get to the absolute beginning of time, and very little can be known about this period.

By the year 1 trillion, the accelerating universe will have infinitely stretched the light from all external galaxies – assuming dark energy truly is Einstein’s cosmological constant and not an unstable field that winds up destroying the universe. Their existence will show that the universe cannot be eternal.

At more than 13 billion years old, the black hole and quasar are the earliest yet seen, giving astronomers insight into the formation of massive galaxies in the early universe.

During the Big Bang, all of the space, time, matter, and energy in the Universe was created. This giant explosion hurled matter in all directions and caused space itself to expand. As the Universe cooled, the material in it combined to form galaxies, stars, and planets.

The earliest known life forms on Earth are putative fossilized microorganisms found in hydrothermal vent precipitates. The earliest time that life forms first appeared on Earth is at least 3.77 billion years ago, possibly as early as 4.28 billion years, or even 4.5 billion years – not long after the oceans formed 4.41 billion years ago, and after the formation of the Earth 4.54 billion years

Life existed before Earth, and may have originated outside out solar system, researchers have claimed. Geneticists have used a theory that usually governs the speed increases of computers – and applied it to life. The results suggest life first appeared about 10 billion years ago – long before Earth, which is believed to be 4.5 billion years old.

One billion years may be called eon/aeon in astronomy or geology. Previously in British English (but not in American English), the word “billion” referred exclusively to a million millions (1,000,000,000,000).

A million seconds is 12 days. A billion seconds is 31 years. A trillion seconds is 31,688 years. A million minutes ago was – 1 year, 329 days, 10 hours and 40 minutes ago. A billion minutes ago was just after the time of Christ.