What is the largest object in the universe?

 A question of how big something can be.

When speaking about the biggest object in the universe, you must always remember galaxy IC-1101.

Why don’t we see how big it actually is?

Milky Way:

Our galaxy, the Milky Way, is 100,000 light-years across, with an estimated 400 billion stars in it. 100,000 light-years would be 1,000,000,000,000,000,000 kilometers across. Now, let’s see how long it would take you, to cross it, with humanity’s fastest spacecraft. Let’s start with the math. As stated earlier, the Milky Way galaxy is 100,000 light-years across, each light-year is approximately 6 trillion miles, and for us to cross just one light-year, it would take us nearly 20,000 years with humanity’s fastest spacecraft New Horizons. Unrealistically, It would take you a wopping 2 billion years to cross our own galaxy with the fastest thing we have.

Andromeda:

The Andromeda galaxy has more than twice the amount of stars than our galaxy has (one trillion to be exact), and is 2.5 million light-years away from Earth. Now, this galaxy is about 140,000 light-years across, compared to 100,000 light-years the Milky Way. Doing the same math, it would take you 2.8 billion years to cross it with the exact same spacecraft, without adding the time it would take you to get there.

Now here ‘s where things get big:

IC 1101:

This galaxy is approximately 1.2 billion light-years away from Earth. It has 100 trillion stars, making literally a dot of the Milky Way, and the Andromeda Galaxy. This galaxy is 50 times the size of the Milky Way, and 2,000 times as massive. Doing the math, it would take us a mind-boggling 100 billion years to cross that galaxy. I must confess I was getting pretty excited while making this answer.

We are as tiny as we can get.

Is it possible to go outside the universe or is there an end?

 Well, our universe has got a very peculiar spacetime geometry (please have a look at my post (The shape of our Universe…… is flat, a sphere, a doughnut? What is outside, more space? Does it have an edge, a centre? A beginning, an end? It pop up from a singularity (what was it?) It’s expanding into what? (Part 1 of 3).). Our universe has got neither a centre nor an end since the main corpus (body) of it has got an Euclidean geometry, and near the borders you find Riemannian geometries full of curved trajectories which always take you back when traveling along straight trajectories according to your navigation instruments. The only way to go outside our universe is by means of a gigantic quantum wormhole which can take you to “another” universe. If you want to travel to any star within our own galaxy using a gigantic quantum wormhole, you’d need the energy of several thousands of stars to build it. But to build a gigantic wormhole to travel to another universe, you’d need the energy of an entire galaxy or the energy of a huge quasar. Now you know, you should start building a quantum wormhole now, but please be careful when selecting the universe you wish to travel to, it must have the same physical laws (and its constants) as ours. Otherwise (with different physical laws), as soon as you pop up in the other universe, you would be immediately disintegrated (in a tremendous cosmic explosion).

What are some mind-blowing facts about the universe?

 

• Sunsets on Mars are blue.

• Pluto is smaller than the United States.

• We know more about Mars and our Moon than we do about our oceans.

• Lemons can cost $2,000 each to ship into space.

• Space is full of space junk, which is small micrometeorites or man-made space debris. They are a huge hazard to spacecrafts.

• A year on Venus is shorter than a day there.

• You would last about 15 seconds in space without a spacesuit.

• There's a reason why space appears black. We don't see stars in every direction because some stars haven't been around long enough for their light to reach us.

• The sun makes up 99.8% of the solar system's mass.

• Venus is the hottest planet in the Solar System, even more so than Mercury, despite the latter being closer to the Sun. This is because of Venus’ thick atmosphere, which essentially traps heat in.

• It rains diamonds in Saturn and Jupiter.

• Our moon is moving away from Earth at a rate of 1.6 inch (4 cm) per year.

• Some spacesuit helmets have a Velcro patch, to help astronauts itch.

• Saturn is the only planet that could float in water. (if we had a sea large enough and Saturn wasn’t made mostly out of gas.)

• Asteroids are the byproducts of formations in the solar system, more than 4 billion years ago.

• The first living mammal to go into space was a dog named “Laika” from Russia.

• The word “astronaut” means “star sailor” in its origins.

• “NASA” stands for National Aeronautics and Space Administration.

• Gennady Padalka has spent more time in space than anyone else. He is an RKA cosmonaut and has spent 879 days in space.

• Mercury has no atmosphere, which means there is no wind or weather.

• Neutron stars are city-size stellar objects with a mass about 1.4 times that of the sun.

• Red Dwarf stars that are low in mass can burn continually for up to 10 trillion years.

• There are more trees on Earth than stars in the Milky Way. There are about three trillion trees on our fair planet, and only a measly 100-400 billion stars in the galaxy.

• It would take a modern spacecraft 450,000,000 years to travel to the centre of our galaxy.

• Earth is the only planet not named after a God.

• There are probably more than 1,000,000,000,000,000,000,000,000 (1 septillion) stars in the universe.

• There is probably a supermassive black hole at the centre of our galaxy.

Source: 15 facts about space that will blow your mind

100 Interesting Space Facts That'll Blow Your Mind | The Fact Site

Can you tell some mysterious facts about the Universe?

 

1. When your TV or any sound-producing recorder or music system is not working properly, the useless noise it produces is actually the result of radiation formed immediately after the Big Bang, which still exists even after 15 billion years.
2. According to astronomy, we say that all physical matter exists in this universe. It contains trillions of stars, solar systems, and galaxies. But this is only 25% of the total matter. There are still many other things yet to be discovered.
3. If NASA sends a bird into space, it would not be able to fly and would soon die, because there is no force there to help it fly.
4. Do you know that dark matter is a type of matter present in the universe that cannot be seen, but its gravitational effect is observed? That is why it is called dark matter — it exists but cannot be seen.
5. If you count 100 stars per minute, you would count an entire galaxy in 2000 years.
6. After the Big Bang, the universe expanded into its present form. But according to modern science, physical matter cannot travel faster than the speed of light. However, according to the Big Bang theory, the universe has expanded to 93 billion light-years in 15 billion years.
   (1 light year = the distance light travels in one year.)

This confusion is explained by Einstein’s General Theory of Relativity. According to it, the farther two galaxies are from each other, the faster they move apart in proportion to their distance. This fact may seem difficult to understand, but if you read carefully, you can understand it gradually.

1. The name of our galaxy is the Milky Way, and our solar system is part of it. In Greek, “galaxy” means “milk.” If you observe galaxies through a telescope, it looks like a stream of milk flowing.
2. The Large Magellanic Cloud galaxy is the brightest of all galaxies. It is visible only in the Southern Hemisphere. It is 170,000 light-years away from Earth and has a diameter of 39,000 light-years.
3. Abell 2029 is the largest galaxy in the universe. Its diameter is 5,600,000 light-years and it is 80 times larger than our galaxy. It is 1.07 billion light-years away from Earth.
4. The Sagittarius Dwarf Galaxy was discovered in 1994 and is the closest galaxy to Earth. It is 70,000 light-years away.
5. The Andromeda Galaxy is the farthest galaxy visible to the naked eye. It is 2,309,000 light-years away from Earth. It contains about 300 billion (30×10¹¹) stars and has a diameter of 180,000 light-years.
6. Most galaxies are elliptical in shape, but some change their shape. Our galaxy, the Milky Way, is elliptical.

1. Abell 1835 IR 1916 is the most distant galaxy in our universe. It is an astonishing 13.2 billion light-years away from Earth. In 2004, astronomers at the European Southern Observatory announced its discovery.
2. The Cosmic Calendar

After the Big Bang, many astronomical and Earth events occurred, including the birth and extinction of dinosaurs. These events happened over such a vast time span that an ordinary person cannot easily understand it. To solve this problem, American mathematician and astronomer Carl Sagan proposed the “Cosmic Calendar.” In this calendar, the entire history of the universe from the Big Bang to now is represented as one year. Here are the events in this calendar:

January 1, 12:00 am — Big Bang; origin of the universe
March 15 — First stars and galaxies formed
May 1 — Formation of the Milky Way
September 8 — Formation of the Sun
September 9 — Formation of the Solar System
September 12 — Formation of Earth
September 13 — Formation of the Moon
September 20 — Formation of Earth’s atmosphere
October 1 — First single-celled life on Earth
October 7 — First known fossils
December 18 — First multicellular life
December 19 — First fish
December 21 — First land plants and insects
December 23 — First reptiles
December 24 — First dinosaurs
December 26 — First mammals
December 27 — First birds
December 28 — First flowering plants
December 29 — Extinction of dinosaurs
December 31, 11:55 pm — Entire recorded human history until now

Source: Google

What are the weirdest stars in the universe?

The Przybylski's star is the weirdest and, so far, most unexplained star humans have discovered, after the Tabby star about which I have already written.

It lies 356 light-years from Earth, is 40% more massive than the Sun, and is named after a Polish astronomer who discovered it in 1961. Its bizarre nature comes from what we discovered it contains: an abundance of heavy elements, including ones that only have short-lived isotopes, which shouldn’t exist in a star about 1.5 billion years old. Such elements exist for only a few years or less. Furthermore, this star contains lower-than-expected amounts of elements such as iron or nickel.

It’s an enigma where these elements come from, and it's even sparked speculation about alien involvement. Supposingly, this star could be a nuclear waste disposal system for an advanced technological civilization.

Without involving extraterrestrials, there are some options where these elements might come from, but none fully explain what is going on.

Maybe this star swallowed a chunk of waste from neutron star mergers. It could consist of very heavy elements, which are created during kilonovas, the rapid neutron capture or the r-process. These are rare events that synthesize vast amounts of elements such as gold, platinum, uranium, and even heavier atomic nuclei. Perhaps they decay within the Przybylski’s star, and we see the products of this decay. Supernovas can also create debris enriched with high superheavy elemental content. Perhaps this star swallowed some debris from a supernova.

This star is very magnetic. Perhaps this helps sort its elemental content into layers. In this view, Przybylski's star is not weird in its content, but in the distribution of its composition, and what we can detect from Earth are the products of radioactive decay of its bizarrely arranged layers.

One of the more fascinating explanations for the weirdness of this star is that it offers evidence that the nuclear island of stability exists. As we discover more and more heavy elements and their isotopes with more and more neutrons, they are increasingly short-lived, but there is a theory that at some point further out on the Mendeleev elemental table, beyond the heaviest known so far, exist superheavy isotopes with longer half-lives.

The Tabby star, which has mysteriously dimmed on short time spans, recently took all the spotlight, but the Przybylski’s star is equally or even more enigmatic, and we genuinely have no idea what causes its peculiar characteristics. It might be an entirely new phenomenon in science about which we have no idea yet.

What are some mind-blowing facts about the universe?

 The best facts there is:

1.. When you look into the night sky, you are looking back in time.

The stars we see in the night sky are very far away from us, so far the starlight we see has taken a long time to travel across space to reach our eyes.

2.. There’s a giant cloud of alcohol in Sagittarius B.

Sagittarius B is a vast molecular cloud of gas and dust floating near the center of the Milky Way, 26,000 light-years from Earth, 463,000,000,000 kilometers in diameter and, amazingly, it contains 10-billion-billion-billion liters of alcohol.

3.. Our solar system’s biggest mountain is on Mars

Olympus Mons on Mars is the tallest mountain on any of the planets of the Solar System. The mountain is a gigantic shield volcano (similar to volcanoes found in the Haiiwain Islands) standing at 26 kilometers tall and sprawling 600 kilometers across.

4.. Neutron stars are the fastest spinning objects known in the universe.

The fastest spinning known pulsar is the catchily-titled PSR J1748-2446ad, which has an equator spinning at 24% the speed of light, which translates to over 70,000 kilometers per second.

5.. Our Galaxy Is on a Collision Course with the Andromeda Galaxy

Even though these two conglomerations of stars are destined to smash together, you shouldn’t lose any sleep over the incident. The impending impact won’t happen for another 3 billion years.

6.. Stellar Nursery

By using observed star formation and supernova events within the Milky Way, astronomers have estimated that 275 million stars are born and die throughout the observable universe each day.

7.. Quasar Query

Quasars occur when gas swirls around a black hole very quickly, and friction causes it to heat up, emitting light. Astronomers have a discovered a group of 73 quasars that are over 6.5 times larger than the average quasar group. This structure is over four billion light-years wide, and actually cannot be explained by the Theory of General Relativity. Theoretically, it shouldn’t even exist.

8.. There are probably more than 170 billion galaxies in the observable universe.

Using data from the Hubble Telescope astronomers have calculated there are likely to be around 170 billion galaxies in the observable universe.

9.. We are all made of stardust

This may sound fanciful, but the reality is almost every element found on Earth was created in the burning core of a star, all the stuff that makes up life on Earth, therefore our bodies are made from stardust.

10.. Long Galactic Year

It takes 24 hours for Earth to rotate on its axis to make a day, and 365 days to orbit around the sun for a year. It takes around 230 million years for our solar system to complete a single orbit around the Milky Way.

What is the biggest moon in the universe?

 Lets start in our own solar bubble and move outward.

The largest moon in our solar system in orbit around Jupiter.

Moving on and we reach “Kepler-1625b-i”, not just a moon, this is an Exomoon with 19.09 times the mass of Earth.

A Neptune-like moon that orbits a massive monster Gas-giant.

This monster moon is in orbit around planet Kepler-1625b, sitting 1AU from its stat and with 11.6 times the mass of Jupiter, making a monster duo.

The star sits just 0.98AU from the gas giant, a spectral clas G and just a little larger than oir own star.

OK, it is a massive struggle to find a moon around a distant planet within an alien star's planetery system, so there will be a larger example someplace, we just need to improve our visual ability's and other things.

We may not have found our targets yet, but there are other candidates.

Kepler-1625b-i

Kepler-1708b-i

WASP-49b-i

809b-I and many MANY more..