The size of the Solar System and the Universe is truly beyond our comprehension. When we think of the vastness of space, we ...

Let’s explore this cosmic perspective together. How big is the universe? It’s a question that stirs both wonder and humility.

Therefore, any estimate of the size of the observable universe must assume that the farthest light we see was released after that pivotal era when space became transparent.

During those 13.8 billion years, the universe has continued to expand following the Big Bang. What this means is that the actual size of our universe is much, much larger than our initial measurement.

If we're willing to go back to when the Universe was just 0.092% its present size, we'll find a Universe that's 1089 times hotter than it is today: around 3000 K.

But if we're talking about the observable Universe, and we know we're only able to access somewhere between the last 10-30 and 10-35 seconds of inflation before the Big Bang happens, then we know ...

The Universe may only be around 14 billion years old, but the observable Universe is around 93 billion light-years across (so we can see ~46.5bn light-years in each direction).

This means that, if the estimates are correct, the total universe is 10 billion times larger than the size of the observable universe. I know that was a bit hard to comprehend, ...

Knowing the observable universe's size and that matter is equally and finitely distributed across it makes it a lot easier to calculate the number of atoms. However, ...

Knowing the observable universe's size and that matter is equally and finitely distributed across it makes it a lot easier to calculate the number of atoms. However, ...

In all directions in space, we can detect the cosmic microwave background (CMB). This is the leftover radiation from around 400,000 years after the universe began, that is faintly detectable and ...