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What Is Our Place In The Milky Way?

What is our place in the Milky Way? And our place in the Universe? In ancient times, many people had the idea our planet Earth to be at the centre of the Universe, as stated by Aristotle and Ptolomeus in their ptolemaic – aristotelic concept of universe: according to this model, Earth is at the center of the universe and all the other celestial bodies orbit around it. Today lots of people think the same. But is this really the case? To answer this question, let’s try to to a travel in the universe, through space and time; we will start our travel from our planet to reach, in the end, the extreme boundaries of the universe.
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During the 1600s, Galileo Galilei, the famous Italian astronomer, was one of the first people, during modern age, to have some doubts about the geocentric model of universe: thanks to telescopic observations, he was able to demonstrate our Earth is not at the rotation centre of planets and the Sun, but really it is the Sun itself. Moreover, observing planet Jupiter, he discovered that the giant planet is the rotation center for its moons. So, Galileo became aware that the center of the Solar System was the Sun, not the Earth!

The Solar System is made by a star, the Sun, eight planets and different types of minor celestial bodies, like comets, asteroids and dwarf planets.
Well, the Earth isn’t at the center of the Solar System, maybe is the closest planet to our Sun? No it isn’t, because it is only the third planet from the Sun: the closest planet to our star is Mercury, followed by Venus and then Earth. The Earth moves around the Sun, our star, just like all the other celestial bodies in the Solar System do: this implies that the Sun, and not our planet, is the center of rotation of the Solar System! The Earth takes a year, 365 days, to travel its orbit, and its average distance from the Sun is 150 million kilometers, which is the measure unit of distances in the Solar System known as the astronomical unit and abbreviated AU. Why do we talk about average distance? Because the orbit traveled by the Earth around the Sun is not circular but elliptical, and this means that there will be an aphelion (i.e. the point of the Earth’s orbit farthest from the Sun, just over 1 AU away from it) and a perihelion (the point of Earth’s orbit closest to the Sun, just under 1 AU). An alternative way to define the astronomical unit passes through the light time, in particular we can say that the average distance Earth – Sun is equal to about 8 light minutes: this means that sunlight takes 8 minutes to arrive on Earth, so that the sunlight we see at a certain moment is not that of that moment but it is the sunlight which left from the Sun 8 minutes earlier! In other words: if the sun went out for example at 2.30 pm, we would only notice it at 2.38 pm! Or again: if you could travel aboard the Star Wars Millennium Falcon it would take you only 8 minutes to travel from the Sun to the Earth (when in reality it takes a few years). To give a more concrete idea of the dimensions of the Solar System: if the Sun were a sphere with a diameter of 14 cm, Pluto would be at 700 m from the Sun, like seven regular soccer fields!

The nearest celestial body to Earth is the Moon, our satellite: to reach it you should take three days off! It’s the same time taken by Apollo astronauts to cover the distance of nearly 400 thousand kilometers that separate Moon and Earth. But if you had Star Trek Enterprise, and travel at maximum curvature, you would only take less than 2 seconds to reach the Moon!

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#InsaneCuriosity #MilkyWay #Galaxies


Why are the stars, planets and moons round, even as comets and asteroids are irregular in shape?#why

#why_Earth_is_round #why_planets_round_shape

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Kuiper Belt: Facts And History!

Kuiper Belt: Facts And History!

From what the belt is, to how it’s helped change the classification of the solar system, and more! Join me as I reveal to you the facts and history of the Kuiper Belt!
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9. What Is The Kuiper Belt?
Despite it being a major part of our solar system, there are many who honestly don’t understand the grand scale and scope of the Kuiper Belt. So allow us to give you some perspective on the matter.
The Kuiper Belt is a circumstellar disc in the outer Solar System, extending from the orbit of Neptune (at 30 AU) to approximately 50 AU from the Sun. It is similar to the asteroid belt, but is far larger—20 times as wide and 20 to 200 times as massive.
Like the asteroid belt, it consists mainly of small bodies or remnants from when the Solar System formed. While many asteroids are composed primarily of rock and metal, most Kuiper belt objects are composed largely of frozen volatiles (termed “ices”), such as methane, ammonia and water.
The Kuiper belt is home to three officially recognized dwarf planets: Pluto, Haumea and Makemake. Some of the Solar System’s moons, such as Neptune’s Triton and Saturn’s Phoebe, may have originated in the region.
In many respects, the Kuiper Belt is the “end” of our solar system in terms of things like the physical objects that are there and reachable. The “edge” of the solar system is a slightly different matter as that would either be the Heliosphere (if you go by magnetic fields) or the Oort Cloud, which is where the suns’ gravity reaches the end of its influence.
But either way, the Kuiper Belt is a major part of our solar system in the literal and figurative sense. Which is rather interesting when you think about it because for a very long time we didn’t understand what was truly in that realm of space as a whole.
8. The Discovery Of The Kuiper Belt
To truly understand the Kuiper Belt, we have to dive into something you’re very familiar with, Pluto.
After the discovery of Pluto in 1930, many speculated that it might not be alone. The region now called the Kuiper belt was hypothesized in various forms for decades. It was only in 1992 that the first direct evidence for its existence was found. The number and variety of prior speculations on the nature of the Kuiper belt have led to continued uncertainty as to who deserves credit for first proposing it.
But let’s go back to the beginning and just break it down from there, shall we?
The first astronomer to suggest the existence of a trans-Neptunian population was Frederick C. Leonard. Soon after Pluto’s discovery by Clyde Tombaugh in 1930, Leonard pondered whether it was “not likely that in Pluto there has come to light the first of a series of ultra-Neptunian bodies, the remaining members of which still await discovery but which are destined eventually to be detected”.
That same year, astronomer Armin O. Leuschner suggested that Pluto “may be one of many long-period planetary objects yet to be discovered.”
This is fascinating for all sorts of reasons, not the least of which is that the discovery of Pluto should have been a finite discovery, or one that led to more study of the planet and what it could mean as a whole. Yet many scientists looked upon it and wondered if it was telling us everything we needed to know about the region.
In 1943, in the Journal of the British Astronomical Association, Kenneth Edgeworth hypothesized that, in the region beyond Neptune, the material within the primordial solar nebula was too widely spaced to condense into planets, and so rather condensed into a myriad of smaller bodies.
From this he concluded that “the outer region of the solar system, beyond the orbits of the planets, is occupied by a very large number of comparatively small bodies” and that, from time to time, one of their number “wanders from its own sphere and appears as an occasional visitor to the inner solar system”, becoming a comet.
That’s not a bad way to describe what the Kuiper Belt really is, and he was right that by modern classifications, the various items in the belt weren’t able to go and become fully-fledged planets. But more on that in a bit.
Before we continue to break down everything that’s going on with the Kuiper Belt, be sure to like or dislike the video, that way we can continue to improve our content for you, the viewer! Also be sure to subscribe so that you don’t miss ANY of our weekly videos!
7. Continued Theories
The more that astronomers wondered about the Kuiper Belt, the more that speculations rose and fell about what it is, what it could be, what it could’ve been, and more.

#InsaneCuriosity #KuiperBelt #TheSolarSystem