# How is it possible that the universe is expanding?

## How is it possible that the universe is expanding?

Based on large quantities of experimental observation and theoretical work, the scientific consensus is that space itself is expanding, and that it expanded very rapidly within the first fraction of a second after the Big Bang. This kind of expansion is known as “metric expansion”.

## How can the universe be expanding if it is infinite?

Originally Answered: How can an infinite universe expand? Increase infinity by any factor and it’s still infinity. If the universe is infinitely large, neither expansion nor contraction changes that. An infinite universe has no spatial boundary, and therefore no barrier exists to constrain its expansion.

Is our universe infinite?

The observable universe is finite in that it hasn’t existed forever. It extends 46 billion light years in every direction from us. (While our universe is 13.8 billion years old, the observable universe reaches further since the universe is expanding).

### How can you prove that the universe is expanding?

Blow up the balloon so its about the size of an orange.

• Clip it with a balloon clip.
• Draw dots on the balloon with a black marker,these represent the the milky way galaxy.
• Remove the clip and keep blowing up the balloon.
• What happens to the dots?
• ### How do we know how fast the universe is expanding?

When astronomers talk about the expansion of the Universe, they usually express it in terms of the Hubble parameter. First introduced by Edwin Hubble when he demonstrated that more distant galaxies are moving away from us faster than closer ones.The best measurements for this parameter gives a value of about 68 km/s per megaparsec .

How was first observed that the universe is expanding?

Evidence for acceleration Supernova observation. In 1998, the first evidence for acceleration came from the observation of Type Ia supernovae, which are exploding white dwarfs that have exceeded their stability limit. Baryon acoustic oscillations. Clusters of galaxies. Age of the universe. Gravitational waves as standard sirens.

#### What theory proves the universe is expanding?

Based on the fact that gravity pulls galaxies together, Albert Einstein’s theory predicted that the universe should be expanding more slowly over time. But in 1998, astrophysicists were quite surprised when their observations showed that the universe was expanding ever faster. Astrophysicists call this phenomenon “cosmic acceleration.”

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