Name: A New Theory Reveals Why Tabby’s Star Looks So Bizarre
Uploaded: 2020-04-13T16:29:57.000Z
Duration: 4 min 19 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

There's an unsolved mystery out there in space.

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One of many, to be sure, but this is one that some people really want to blame on aliens

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because we haven't had a stronger explanation.

I'm talking about Boyajian's star, or KIC 8462852 and some new observations that

may have just given us the information we need to say with certainty: Aliens!?

Boyajian's Star, previously referred to as Tabby's star, is named after the astrophysicist

who first studied its inexplicable behavior.

It's a bit larger than our own sun, and is about 1300 light-years away.

And it displays behavior that we just can't figure out.

Actually, it's the most unusual dimming of a star ever observed.

Its brightness dips in totally erratic and unpredictable ways.

Sometimes just a tiny bit, sometimes by as much as 22 percent.

And here's the thing—these behaviors can't be attributed to most of the things you would

The dimming is much too substantial to be caused by an orbiting planet, because even

planets as big as the biggest ones in our solar system would only make a tiny blip in

Plus, if it were a planet, we should be seeing the same dip in brightness at regular intervals

as the planet runs rings around that star, but no.

Maybe it was a swarm of comets careening toward the star.

But then astronomers found that the star actually has been dimming steadily for years in

addition to the unpredictable blips in brightness—it's losing its shine, and it's about 14% less

A comet cloud couldn't cause something that gradual.

So the lack of any convincing explanation for its finicky behavior is what gave rise to

this idea of energy-generating alien technology, like a Dyson sphere, which I think is pretty hilarious.

It is indeed very tempting to think that the unpredictable dimming of this star is due

to some alien megastructure passing in front of it to gather power.

But a new model from Columbia University may just give us an answer that doesn't rely

on the existence of a hyper-developed solar-powered alien civilization.

The new theory says that maybe Boyajian's star has been a little bad.

Like the villain in a Charles Dickens novel, it may have stolen an orphaned exomoon.

This hypothesis is based on the idea that the star pulled a moon into its orbit from

a now long-gone planet, and the poor moon is now being torn apart by stellar radiation

that it wasn't used to in its previous life, orbiting merrily around a planet.

The resulting plumes of debris from the moon's outer layers blow off into the solar system,

coming in between the star and Earth, causing—from our perspective—the occasional, unpredictable

But what makes this theory so tantalizing is that it also explains the gradual wane

As more and more of the moon breaks up, the larger, heavier chunks are getting pulled

into orbit with what remains of the original exomoon.

This forms a disk of debris that sticks around, dimming the star's light over time.

Using models of both exomoon detachment dynamics and obscuration of stellar light, the team

has compiled some pretty convincing evidence for this hypothesis—and it's certainly

at least a little more credible than the idea of alien technology.

But we still need a bigger sample size to come to any hard conclusions

And we're in luck, because it turns out—Boyajian's star has friends!

A new study surveyed more than 14 million stellar objects, and found 21 stars that also

might display unusual, unexplained dips in brightness.

The hope is that this data will allow us to study these bodies, and look for clues to

see if the same mechanism is behind each of their blinking and winking, and if so, if

it just might be this orphaned exomoon theory.

If you want even more on some crazy behavior of stars that we're just beginning to uncover,

watch this video here, and subscribe to Seeker for all your stellar exploration news.

Let us know what other space mysteries you want us to cover in the comments below, and

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A New Theory Reveals Why Tabby’s Star Looks So Bizarre

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