What is the universe?

What is the universe?

Universe

 Earth and therefore the Moon are a part of the universe, as are the opposite planets and their many dozens of moons. along side asteroids and comets, the planets orbit the Sun. The Sun is one of many billions of stars within the Milky Way galaxy, and most of these stars have their own planets, referred to as exoplanets.

The Milky Way is but one among billions of galaxies within the observable universe — all of them, including our own, are thought to possess supermassive black holes at their centers. All the celebs altogether the galaxies and every one the opposite stuff that astronomers can’t even observe are all a part of the universe. It is, simply, everything.

Though the universe could seem a wierd place, it's not a foreign one. Wherever you're immediately , space is merely 62 miles (100 kilometers) away. Day or night, whether you’re indoors or outdoors, asleep, eating lunch or dozing off in school , space is simply a couple of dozen miles above your head. It’s below you too. About 8,000 miles (12,800 kilometers) below your feet — on the other side of Earth — lurks the unforgiving vacuum and radiation of space .

In fact, you’re technically in space immediately . Humans say “out in space” as if it’s there and we’re here, as if Earth is break away the remainder of the universe. But Earth may be a planet, and it’s in space and a part of the universe a bit like the opposite planets. It with great care happens that things live here and therefore the environment near the surface of this particular planet is hospitable for all times as we all know it. Earth may be a tiny, fragile exception within the cosmos. For humans and therefore the other things living on our planet, practically the whole cosmos may be a hostile and merciless environment.

How old is universe?

The universe, on the opposite hand, appears to be about 13.8 billion years old. Scientists received that number by measuring the ages of the oldest stars and therefore the rate at which the universe expands. They also measured the expansion by observing the Doppler effect in light from galaxies, most of which are traveling faraway from us and from one another . The farther the galaxies are, the faster they’re traveling away. One might expect gravity to slow the galaxies’ motion from each other , but instead they’re speeding up and scientists don’t know why. within the distant future, the galaxies are going to be thus far away that their light won't be visible from Earth.