ক্রমশ হারাচ্ছে কক্ষপথের ভারসাম্য! সূর্যের মধ্যে মিশে যেতে পারে পৃথিবী?

Asianet News Bangla

আপনি কি কখনও ভেবে দেখেছেন যে মহাকাশে আমাদের গ্রহ কি সত্যিই নিরাপদ? শক্তিশালী কম্পিউটার সিমুলেশন ব্যবহার করে করা একটি নতুন বৈজ্ঞানিক গবেষণা জানাচ্ছে এমনই আশঙ্কার কথা।

Transcript

00:00Have you ever looked up at the night sky and wondered, are we really safe here on Earth?

00:06What if, one day, our planet got knocked off its path or even thrown out of the solar system?

00:13Sounds impossible, right?

00:15But a new scientific study warns that this is not just science fiction.

00:19Today, we are diving into a fascinating and slightly terrifying study that looks billions

00:25of years into the future.

00:28It used powerful computer models to predict what might happen to Earth and its neighboring

00:34planets.

00:35What scientists found could change the way we see our place in the universe.

00:41Earth orbits the sun along with seven other planets, countless moon, dwarf planets like

00:47Pluto, asteroids, comets, and a mysterious odd cloud way out at the age.

00:55For over 4 billion years, this dance has been stable enough to let life flourish on Earth.

01:01Studies suggest that the sun's gravity is the main anchor, but the planets also pull on

01:07each other, subtly changing each other's orbits over millions of years.

01:13It is like eight dancers holding hands, each gently tugging at the other.

01:19If something big tucks from outside, the whole dance can break.

01:24So if we question what could disturb this balance, the answer is passing stars.

01:30Our solar system is drifting through the Milky Way, surrounded by hundreds of billions of

01:35other stars.

01:35Every few million years, one comes relatively close.

01:41The word close might still means trillions of kilometers.

01:45But even from that distance, a star's gravity can nudge things around special objects on

01:51the outer edge.

01:53In a new study, scientists ran thousands of computer simulations looking ahead 4 billion

01:59years.

02:00They discovered something surprising, that is, the orbits of some planets, like Mercury

02:06and Pluto, are more unstable than we thought.

02:11Mercury has a 50-80% chance of reading off its current orbit, while Pluto might also be pushed

02:18off course over 5 billion years.

02:21Even Mars has a 0.3% chance of colliding with another planet or being ejected, and Earth,

02:28a 0.2% chance of getting thrown out of the solar system or colliding with another planet.

02:35You might think 0.2 is not much, but over billions of years, even tiny probabilities add

02:42up, and the consequences would be, well, catastrophic.

02:48Here is how it might play out.

02:51Our passing stars slightly changes Mercury's orbit.

02:55Mercury then tugs on Venus or Mars, which in turn pushes Earth out of its usual path.

03:02Earth could spiral inward, getting closer to the Sun, turning our planet into a scorched

03:07wasteland.

03:09Or Earth could drift outward, where Jupiter's immense gravity might flink it completely out

03:15of the solar system.

03:17In that case, Earth would become a rough planet, dark, frozen and lifeless, drifting through

03:24interstellar space.

03:27But even if we escape passing stars, there is another, inevitable threat, the Sun itself.

03:36About 5 billion years from now, the Sun will run out of hydrogen fuel.

03:41It will swell into a red giant, engulfing Mercury and Venus.

03:45Earth might also be swallowed, or at least roasted beyond recognition.

03:51After that, the Sun will shed its outer layers and shrink into a white dwarf, a dense, dying

03:58amber of its former self.

04:01The solar system we know today will be gone.

04:05Let us go back to the age of the solar system for a moment.

04:10In the next million years, other stars could pass closer.

04:14One candidate is Gliese 710, expected to come within about 0.2 light years in about 1.3 million

04:23years.

04:26So how do scientists predict all this?

04:29They build detailed computer models of the solar system and run simulations thousands of

04:34times, changing the starting condition slightly each time.

04:39These models take into account the gravity of the planets, the Sun, and the effects of

04:44passing stars.

04:47By looking at the result, they can see the most likely outcomes and the rare but dangerous

04:52ones.

04:53The good news?

04:54For now, Earth's orbit is stable.

04:58No known star will pass close enough in the next few thousand years to cause serious trouble.

05:04These catastrophic scenarios are mostly billions of years away.

05:09But understanding them helps scientists learn more about cosmic history and what could happen

05:15to other planets too.

05:17For now, we can look up at the night sky knowing that our home is part of a vast, beautiful and

05:24sometimes dangerous cosmic dance.

05:28If you found this video fascinating, don't forget to subscribe for more related stories.

05:33Stay tuned.

Recommended

Category

Transcript

Recommended