# 100 AMAZING AND INTERESTING FACTS ABOUT THE UNIVERSE – PART 4

Hello everyone! I am back with another 10 facts about the universe. As we all know, universe is full of oddities and unbelievable facts.

This is a series of 100 amazing and interesting facts about the universe. There will be total of 10 articles consisting of 10 facts each.

Till now, we have been discussed 3 such installments of 100 amazing and interesting facts about the universe. The following are the links to previous such posts.

Today we will discuss another 10 facts about the universe. In this post we will learn a lot about our universe. So, without wasting any time, we should start.

## A Day Longer Than A Year

What is a day? yeah, yeah, I know, you know the answer. A day is a time taken by our Earth to complete one rotation on its axis and this is correct.

Now, what is a year? Well, fine enough. A year is a time duration taken by our Earth to complete one orbit around the sun.

This is the definition of a day and a year on Earth which is similar for all the other planets in their time.

Each planet in our solar system has a year far longer than it day. But there is one planet which has a shorter orbital time or a year then a rotational time or a day. It is strange, isn’t it?

Well, Venus is that planet. Venus takes 243 earth days to complete a rotation on its axis, called Venusian day. While it takes only 224.7 earth days to complete an orbit around the sun, called Venusian year.

From the above elaboration, we can say a day on Venus is longer than a year by a margin of 18.3 earth days.

## Nearest Black Hole to the Earth

Do you know, how far is the nearest black hole? Well, it is 3,300 light-years away. It means if we somehow manage to travel on the speed of light, it would take 3,300 years to reach us to the nearest Black Hole.

This black hole has entitled with a name A0620-00. This Black Hole is located in the constellation of Monoceros.

This Black Hole has a mass of 6.6 times that of our sun. Due to its high mass, it can not be categorized into the Neutron Star Category. So, it is now considered as a stellar-mass Black Hole.

## Incomplete Orbit

We all know there 5 dwarf planets – Pluto, Ceres, Haumea, Eris, and Makemake. Do you know, when did they have completed their orbit?

Don’t know when? It doesn’t matter, they haven’t yet. Not since they have been discovered. All the 5 dwarf planets have not completed their orbit around the sun since their discovery.

## Cosmic Cannibalism

I hope you all must be aware of the word cannibalism. The word Cannibalism is when species or a type of eating the same type. Like humans eating human flesh is an act of cannibalism.

Now, what does this cosmic cannibalism means? Like humans eating human flesh, stellar systems or galaxies are also eating each other by merging with those fully or partially.

There is a theory that suggests the collision of the Milky Way galaxy with its neighboring galaxy Andromeda.

The Andromeda is moving towards the Milky Way Galaxy at a speed of 110 kilometers per second. The theory also says that it will take around 4 billion years to directly collide with the Milky Way Galaxy.

## A Comet’s Tail

A comet is a very small frozen celestial object in the outer system which is extremely difficult or impossible to detect.

If we talk about the comet’s tail, it is made when comes near the sun. When it comes near the sun it starts melting. Due to melting it converts into gases and fluids.

A vast plume gas, millions of kilometers across is blown out behind by the solar wind. The tail is what we see, shining as the sunlight catches.

## Solar Flares

What is a solar flare? A solar flare is an instant flash of increase brightness on a star. It can be easily observed near the surface of stars and in the close proximity of it.

Solar flares may reach to a temperature of 10 Million degree Celsius. It has an energy of a million atom bombs.

## Footprint of Human on the Moon

The moon is the only other world that humans have set foot on. As we all know, the moon has no atmosphere or wind.

The footprints planted in its dusty surface in 1969 by the Apollo astronauts are still there today, perfectly preserved. and it will be preserved for the next million years until any atmosphere found on the moon.

## Limited Fuel of the Sun

We all know that the sun is a vast source of energy for the lives on earth. But, do you know, for how much time will it continue to provide energy? Scientists say it would last for 5 billion years more.

Sun has almost 73% hydrogen, and this hydrogen is getting fused with each other and generating a huge amount of energy.

Every second 600 million tons of hydrogen fuses and generates Helium. In this process 4 million tons of matter converts into energy which is an irreversible process.

In a simple word, the sun is losing 4 million tons of hydrogen each second. So, by the time passing, the sun will be ran out of its all hydrogen and there will be nothing for further fusion.

There will a large amount of an inert gas, helium. Now, the sun will use it’s helium and become a “Super Nova”.

## Multiverse

It’s become a much more accepted idea that we live in a universe that is one of many. It originates from the theory of eternal inflation.

The theory states that after the Big Bang, space and time expanded at different rates and in different places.

This allows the opportunity for bubble universes to exist, each one functioning with its own set of physics.

Imagine two soap bubbles colliding; where they intersect with each other, there exists another circle that could be according to the eternal inflation theory, a bubble universe.

## We are Made of Stardust

The elements found on Earth come from the stars. That means all the things that make up the earth including the life present is comprised of stardust.

According to Carl Sagan, “The nitrogen in our DNA, the calcium in our teeth, the iron in our blood, all made from the interiors of collapsing stars. We are made of star-stuff”.

If you take time to think about that, it’s absolutely mind-blowing to think we are so deeply connected with the stars in the sky that we look out on. If not for the death of stars we would not have life.

## Conclusion

That’s it for today. we have learned 10 new facts about the universe. In this article we have gone through following facts about the universe.

We have studied that a planet in the solar system has longer day than its year. And then we knew about the nearest Black Hole.

After getting the knowledge of nearest black hole, we knew about the dwarf planets that has not completed their orbit yet. Then, we got the concept of cosmic cannibalism.

Cosmic cannibalism was not the last. After that we understand the formation of Comet’s Tail and solar flare.

We learned may other topics which may increase our knowledge about the universe.

This is not the end, we will learn similar facts about the universe in the days to come. Till then, stay updated.