Lifestyle R

learn more about our planet and other fascinating stuff concerning the universe
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15/08/2025

Let's go

12/08/2025

Do Palestinians believe Israel has the right to exist as a sovereign nation?From the moment Israel was established, Palestinian Arabs refused to recognize it’s right to exist. For 77 years they have been trying to destroy it, and rejected all the proposals to establish their own state alongside with Israel. They claim for all the territory “from the river to the sea”, and don’t agree to anything else. Their approach has never changed. They hate Israel as hard as they did 77 years ago, and deny its right to exist as a sovereign nation.

Meanwhile, Israel has become a thriving democratic state with high-level science, education, health care, high tech industry, social security, etc., while the so-called “Palestine” remains the same sh****le it was 77 years ago. It’s not able to provide itself even with the critical supplies like food, water, electricity and fuel, and wholly depends on its enemies - Israel and Western sponsor states. Both PA and Gaza are failed states (though they are are not states yet). They don’t want to live like civilized people. If you teach your children Quran, Jihad, and hatred for the Jews instead of science and arts, you'll have a fully predictable result. And if your stupid religious bigotry makes you start a war that you have no chance to win, you will look like this:

10/08/2025

Boomerang Nebula is the coldest place in the universe. It is situated 5000 light years away from earth in Centaurus constellation. It has temperature just 1 Kelvin, making it even colder than the cosmic microwave background radiation (2.7 K). This extreme cold happens because the dying star at its center is rapidly expelling gas so fast it cools beyond the usual temperature of space. It reminds us how mysterious is our universe is.

10/08/2025

What Powers the Brightest Objects in the Universe?
The brightest object in the universe is a quasar. Now what is quasar? It is like headlight of a car (galaxy) where supermassive black hole(SMBH) is the engine of that car. It's the best simple way to analog galaxy, supermassive black hole and quasar. So that SMBH Powers the brightest object.

When matter infalling to a black hole, it spirals and forming an accretion disc. For friction and spinning property of black hole, this region's temperature goes to million to billion kelvin. At centre where quasar is, gravity turns into light and high velocity (nearly equal to velocity of light)relativistic jets are emerged. That quasar for milky Way galaxy is 1000 times brighter than that of milky way itself. It can shine whole galaxy.

So the answer is SMBH powers the brightest object (Quasar)in the universe.

Image source: google

10/08/2025

How big is the universe compared with Earth?
i wil answer just with this legendary photo from voyager

The "Pale Blue Dot" picture of Planet Earth was acquired by the Voyager 1 probe exactly 30 years ago on Friday, from a distance of about 6 billion km (4 billion miles). [1]

Compared to our galaxy, Earth it’s just a “dust”.
But don't feel small. Try going out and about, at least in your city. Then you will find many places you don't know and many people you don't know, and you will know how big this world is.

Footnotes

[1] Nasa 're-masters' classic 'Pale Blue Dot' image of Earth

10/08/2025

How small is this planet when you consider there are around 2 trillion galaxies in the observable universe, many with diameters of 100,000+ light-years? So trifling, yet so unique, so precious!If you scale down the Earth to the size of a grain of sand, 1mm in diameter, a scale down of 13,000,000,000 then the Milky Way would be 242 light seconds in diameter, or 73000000000 meters, stretching halfway to the Sun.

It’s basically impossible for humans to understand those differences, because we have no references that we can use.

A reference I often use when trying to get a feeling for big numbers is to convert them to a volume that can be visualized.

For example, if you think of a cube the size of 1 mm. You can fit 1000 in a meter, and a million in a square meter, and a billion in a cube with the side 1 meter. It’s possible to visualize that box and at the same time visualize the small cube 1 mm in side as a part of the bigger cube.

10/08/2025

If the speed is 1 light year per second, can you fly out of the universe?The radius of the observable universe is 46 billion light years. At one light year per second, that would be 46 billion seconds. That’s around 825 years, actually longer because the universe is expanding. However, that’s just the observable universe. There is more out there that we can’t see.

It’s not clear that there is such thing as “outside of the universe,” and it is likely that the universe is infinite. I also suspect that going faster than the speed of light would mean going back in time from your perspective, so you might well end up incinerated near the beginning of the universe.

10/08/2025

How do we know the universe has no end?We do not know. We suspect that it might be infinite in size because of what is called the Flatness Parameter.

The universe could have several shapes. Here are three:

Round, saddle-shaped, and flat. If it is round, it’s thought be likely that it will collapse back on itself. If it’s saddle-shaped, it will not. If it’s flat, there’s no way to know, but flatness indicates infinite in size and so far, it seems to be flat. That could be because the curve is so slight that we can’t measure it.

So we don’t know for sure, but we think it’s flat and infinite in size. Maybe.

10/08/2025

What is the significance of an infinite universe if we are the only intelligent life?Famed physicist Stephen Hawking raised this issue years ago in his popular book A Brief History of Time. He suggested that this “vast number of stars and galaxies seems a waste.” However, ongoing research has given us good reasons—all relevant to life’s existence—for the massiveness of the cosmos. We need it for essential construction materials. Put simply, it takes a lot of time and a lot of space for there to be life anywhere.

It takes having three generations of stars for us to have enough heavy elements to allow life. That’s not even mentioning supernovae that take time and yet provide the heaviest elements like Uranium and Thorium. Yes, even those very heavy elements are needed for the Earth’s tectonic plate action and hot rotating core which gives us our magnetic field. That field is totally necessary to protect us from radiation from the sun and universe (stellar wind). Otherwise, no life.

It took 8 billion years before the construction of our planet could begin. We should also recognize that after the big bang, early on, the universe became large enough that stars and galaxies began to form. However, when the universe was very young, these galaxies were jammed so tightly together that they routinely ripped spiral arms—sites of strong star formation—off one another (due to the pull of gravity). During this time radiation was severe. No life could form. After several billion years of cosmic expansion, galaxy clusters and the galaxies within them spread far enough apart that this ripping process became much less frequent.

There is more, but we now clearly know it takes a huge and old universe for life to have any chance at all.

10/08/2025

Is there really another world besides Earth where intelligent beings exist?
The image above contains at least a million galaxies, not stars, but galaxies (Image credits: CNN via Rubin’s Observatory)

Well, in simple words, the answer is Yes.

But I’m assuming you didn’t ask such a pertinent question for such a one word answer.

The conditions on earth responsible for allowing life to flourish are so common across the galaxy, let alone the entire universe that it is very much possible that there’s not just intelligent life, but also the life that kind of resembles us.

According to the most widely accepted hypothesis, abiogenesis caused the transition of non-living into living matter because of the reactions in thermal vents deep beneath the sea, from unicellular organisms to multicellular organisms, then the fish, amphibians, vertebrates, mammals, apes, monkeys, a long lineage of Homo Sapiens started from the Australopithecus followed by other hominins and finally the Neanderthals', Denisovans, homo erectus and finally homo sapiens, giving us a deep understanding of how chemistry, evolutionary biology and other natural factors led to the origins of life, followed by intelligent life.

Now comes the more obvious part of the answer, which despite being speculative, makes a lot of sense. SETI, when asked why we have not heard from the others in over four decades of radio astronomy work the organization has put in, SETI eloquently responded that scanning the part of skies that we have so far is like filling up a glass with ocean water and concluding there are no fish in the sea.

Such is the scale of the universe. Infinity is the only number that comes to mind to represent this scale. Still, in more informative terms, our sun is only one of the projected 200–400 billion stars in our milky way galaxy. If our sun is accompanied by 8 planets, there’s no reason to not believe the same for other stars. And since Earth holds liquid water due to its position in the solar system, being in the goldilocks zone; water - the stuff of life, then it is safe to assume that a fraction of the stars in our milky way alone will have such conditions on planets that will eventually give way to life. Since there is possibility of plenty of intelligent life in our galaxy alone, our observable universe contains at least 2 trillion galaxies. That’s 2000 billion galaxies. x 200–400 billion stars x at least 3 planets = the number can not even be fathomed.

So yes, there is another world. Without a shadow of a doubt.

Intelligence is not just limited to our planet.

In words of Eleanor Arroway (Contact 1997) which she probably borrowed from Carl Sagan-

“If it’s just us, it’s an awful waste of space.”

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