Have you ever gazed out at the night sky and been fascinated by a bright band of stars? That’s the Milky Way – the galaxy where our sun hangs out. And the sun is not the only star in the Milky Way, and the Milky Way is not the only galaxy in the universe. Astronomers have long since been in the quest to find out exactly how many galaxies there are in the universe, and you won’t believe the numbers they’ve come up with! Today we have telescopes both on the ground, and in outer space, that regularly stare into the vast universe to detect the faintest and most distant galaxies. In 2016, a study conducted by a team of astronomers used 3D modeling of images collected over 20 years by the Hubble Space Telescope to determine the number of galaxies. What they found was amazing… TIMESTAMPS:
The variable stars 🌟 0:54
125 billion galaxies? Well, it's not much 2:28
What the observable universe is 3:19
The farthest galaxy (it's really far, far away) 4:09
The star we're seeing 4 years in the past 4:44
How old is the universe? 5:52
The farthest individual star we’ve seen to date 7:13
So what about 300,000 new galaxies? 7:53 #space #planets #brightside SUMMARY:
– With time, as humans progressed, the scope of what we considered the universe also advanced. – For a large part of human history, we considered the Milky Way to be the only universe. We thought that all the stars that we see belong to it.
– This belief didn’t change until the 1900s, when scientists identified stars whose brightness seemed to change when observed from the earth. – Then came Hubble, who, using the Hooker telescope at Mount Wilson Observatory, California, identified several of these variable stars. – Today we have telescopes both on the ground, and in outer space, that regularly stare into the vast universe to detect the faintest and most distant galaxies. – Scientists determined that there are about 125 billion galaxies. But that large number appears faint compared to what scientists would discover a few years later.
– In 2016, a team of astronomers said there are over 2 trillion galaxies. These galaxies lie in what is known as the observable universe.
– The light from our Sun, which is just about 93 million miles away from the Earth, takes 8 minutes and 20 seconds to get here. And so, if the light from the nearest star, Alpha Centauri, takes more than 4 years to reach us, it means we're seeing that star 4 years in the past. – It’s now generally accepted that the universe is about 13.8 billion years old.
– A very fascinating, and yet sometimes confusing, aspect of the universe is that its size is not permanent. Instead, it’s been growing ever since it was created by the Big Bang. – The enormous blue star nicknamed Icarus is the farthest individual star we’ve seen to date.
– But even with such advanced systems, scientists say that they’ve only been able to chart 2 percent of the sky so far. Music by Epidemic Sound https://www.epidemicsound.com/ Subscribe to Bright Side : https://goo.gl/rQTJZz
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