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What If Another Sun Entered Our Solar System?

What If | November 9, 2025



With the vastness of the Universe, everything in it seems so spread out. But some objects are closer than you might realize. Every now and then, a random interstellar asteroid passes through the Oort cloud, the wall of icy debris at the very edge of our Solar System. But what if a rogue star unceremoniously rampaged right through the Oort cloud?

Watch more what-if scenarios:
Planet Earth: https://www.youtube.com/watch?v=_-HhCwYD7rc&list=PLZdXRHYAVxTJCzxwmCq0NNpYq9N9wyb2l
The Cosmos: https://www.youtube.com/watch?v=gfuJyVkMH_g&list=PLZdXRHYAVxTJno6oFF9nLGuwXNGYHmE8U
Technology: https://www.youtube.com/watch?v=CS3bBO05fpU&list=PLZdXRHYAVxTIeRY3JtgXgoGqSEB7kDdKO
Your Body: https://www.youtube.com/watch?v=QmXR46TrbA8&list=PLZdXRHYAVxTJNsV9FFeNAKl2ySsHj8GZO
Humanity: https://www.youtube.com/watch?v=fdCDQIyXGnw&list=PLZdXRHYAVxTIFnvmOeWbv-Mt8zFxSCSvZ

Tweet us your what-if question to suggest an episode: https://twitter.com/WhatIfScience

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What If is a mini-documentary web series that takes you on an epic journey through hypothetical worlds and possibilities. Join us on an imaginary adventure — grounded in scientific theory — through time, space and chance, as we ask what if some of the most fundamental aspects of our existence were different.

Written by What If

Comments

This post currently has 30 comments.

  1. @KocerSohail

    November 9, 2025 at 8:59 am

    Sun: Earth why are you sweating a lot
    Earth: Sun another Sun is in our solar system
    Sun: (takes a look at about Sun)
    Sun: Sun what are you doing here
    another Sun

  2. @JesseJamison-o8c

    November 9, 2025 at 8:59 am

    Please just use "Miles per hour" if I have to try to calculate how much kilometers something is traveling in space and not get a definitive answer, I will never like or subscribe anymore videos . Please use the American system of measuring so I can understand something that's going on out in space otherwise you get no likes or subscribe.

  3. @berjaboy

    November 9, 2025 at 8:59 am

    If we still are around, just imagine where we'd be technologically. Who knows, by that time we may of already mined the Oort cloud of most of its resources. In 1.3 million years I have little doubt we wouldn't be able to deal with the intruder.

  4. @fazletarik9638

    November 9, 2025 at 8:59 am

    The sun: hey everyone buckal up your heats and coldness its gileese 710 is coming!!!
    Earth: ……we dead….
    Saturn and unknown planet: AHHHHHH
    Gas giant planet hits Jupiter
    Jupiter: hey I survived! You ******
    Comet passes through Neptune
    Neptune: ……g.i.l.e.e.s.e… 7.1.0 stop it. you are harming the planets!
    Gileese 710: ha, how can you stop me huh? Hahahahha I'm gonna destroy the sun! Hahahahahaha
    Bye,bye!
    gileese 710 eats Neptune up
    Live on earth: oh shit!
    (10 years later)
    Gileese 710: it's over sun!
    Sun: No… I will miss you all….bye..by…
    RED NOVA

    BY ME

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