How did the astronomers estimate the age of the universe?
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.
What was formed as the universe expanded and cooled down?
The universe was born with the Big Bang as an unimaginably hot, dense point. As space expanded, the universe cooled and matter formed. One second after the Big Bang, the universe was filled with neutrons, protons, electrons, anti-electrons, photons and neutrinos.
What happens when you get to the end of the universe?
If the Universe holds enough matter, including dark matter, the combined gravitational attraction of everything will gradually halt this expansion and precipitate the ultimate collapse. Over time, galaxies, then individual stars, will smash into each other more frequently, killing off any life on nearby planets.
How did astronomers determine that the universe is expanding?
American astronomer Edwin Hubble and others discovered in the 1920s that the Universe is expanding by showing that most galaxies are receding from the Milky Way — and the farther away they are, the faster they are receding. The roughly constant ratio between speed and distance became known as the Hubble constant.
How can astronomers measure the age of the universe from the speed and distance of a single galaxy?
You can actually calculate an estimate for the age of the Universe from Hubble’s Law. The distance between two galaxies is D. The apparent velocity with which they are separating from each other is v. So, you can take 1/H0 as an estimate for the age of the Universe.
How was the universe formed short answer?
Our universe began with an explosion of space itself – the Big Bang. Starting from extremely high density and temperature, space expanded, the universe cooled, and the simplest elements formed. Gravity gradually drew matter together to form the first stars and the first galaxies.
What happened when the universe started to cool?
As the universe cooled, the four fundamental forces in nature emerged: gravity, the strong force, the weak force and the electromagnetic force. Protons and neutrons began to form. The temperature of the universe was around 10^32 Kelvin.
What created the universe?
Will the universe be reborn?
The universe could bounce through its own demise and emerge unscathed. The reigning theory holds that the universe ballooned in size in the first sliver of a second after the big bang in a period called inflation. …
What is expanding universe theory?
noun. the theory, developed from the observed red shifts of celestial bodies, that the space between galaxies is expanding, so that they appear to recede from us at velocities that increase with their distanceSee also oscillating universe theory.
What does 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 does the universe look like from the quantum perspective?
From the quantum perspective the universe is an extremely interactive place. Wheeler takes the quantum view and runs with it. As Wheeler voices his thoughts, he laces his fingers behind his large head, leans back onto a sofa, and gazes at the ceiling or perhaps far beyond it.
Do we know the universe at the most fundamental levels?
Wheeler believes the quest for an answer to that question inevitably entails wrestling with the implications of one of the strangest aspects of modern physics: According to the rules of quantum mechanics, our observations influence the universe at the most fundamental levels.
What was the universe like after the Big Bang?
As space expanded, the universe cooled and matter formed. One second after the Big Bang, the universe was filled with neutrons, protons, electrons, anti-electrons, photons and neutrinos. Related: What Is Big Bang Theory?
What did Edwin Hubble discover about the expansion of the universe?
Expanding universe In the 1920s, astronomer Edwin Hubble discovered the universe was not static. Rather, it was expanding; a find that revealed the universe was apparently born in a Big Bang. After that, it was long thought the gravity of matter in the universe was certain to slow the expansion of the universe.