How big did the universe get in the first second after the Big Bang?

In the first period, the universe grew from an almost infinitely small point to nearly an octillion (that’s a 1 followed by 27 zeros) times that in size in less than a trillionth of a second. This inflation period was followed by a more gradual, but violent, period of expansion we know as the Big Bang.

How fast was the universe expanding at the Big Bang?

Scientists have now published the first good SBF estimate of the Hubble constant, pegging it at 73.3 km/s/Mpc: in the ballpark of other measurements of the local expansion, including the gold standard using Type Ia supernovae.

How much time did it take for the universe to initially expand from the size of less than a pinhead to larger than a city?

So how big was it all the way back then, some 13.8 billion years ago? Let’s look to the Universe we see to find out. The Hercules galaxy cluster showcases a great concentration of galaxies many hundreds of millions of… [+]

What did the universe expand into?

The universe is everything, so it isn’t expanding into anything. It’s just expanding. All of the galaxies in the universe are moving away from each other, and every region of space is being stretched, but there’s no center they’re expanding from and no outer edge to expand into anything else.

What happened in the first few minutes of the universe?

At the very instant of the Big Bang, the Universe formed as a rapidly expanding ball of energy at extremely high temperatures (trillions of degrees). Thus, just some 3 minutes after the Big Bang began, the Universe was composed of hydrogen and helium nuclei with a great deal of leftover energy.

How long will universe expand?

Assuming that dark energy continues to make the universe expand at an accelerating rate, in about 150 billion years all galaxies outside the Local Supercluster will pass behind the cosmological horizon.

How fast is the universe expanding compared to the speed of light?

Instead of speeds exceeding 299,792 km/s (the speed of light in a vacuum), these galaxies are only moving through space at ~2\% the speed of light or less. But space itself is expanding, and that accounts for the overwhelming majority of the redshift we see.