Placeholder Image

Subtitles section Play video

  • There are more than a trillion galaxies in the universe.

  • And my team discovered an extremely rare one,

  • a galaxy that doesn't look quite like anything observed before.

  • This galaxy is so peculiar,

  • that it challenges our theories and our assumptions

  • about how the universe works.

  • The majority of the galaxies are spiral,

  • similar to our own Milky Way.

  • We have strong theories about how these common galaxies form and evolve.

  • But we don't understand how rare galaxies form and evolve.

  • An especially puzzling rare case is Hoag's Object.

  • It has a very symmetric central body surrounded by a circular outer ring,

  • with nothing visible connecting them.

  • Hoag-type galaxies are among the rarest types of galaxies currently known.

  • There are fewer than one in 1,000 galaxies.

  • It's a mystery how the stars in the outer ring are just floating there

  • in such an orderly manner.

  • That's interesting, right?

  • Hold on.

  • Things are about to get more mysterious.

  • The galaxy that my team discovered is even rarer

  • and much more complex than that.

  • You know, sometimes, you search and search for these objects,

  • and you find nothing.

  • But sometimes, it just appears in the background,

  • when you are not even looking for it.

  • This system looks very similar to Hoag's Object,

  • with its central body and circular outer ring.

  • We got very excited and thought we discovered another Hoag's Object.

  • But my research showed this is an entirely new galaxy type,

  • now commonly referred to as "Burçin's Galaxy."

  • (Laughs)

  • (Cheers) (Applause)

  • We will not be visiting this galaxy anytime soon.

  • It is approximately 359 million light years away from Earth.

  • You may think this is far.

  • Well, actually, this is one of the nearby galaxies.

  • I study this object in different light --

  • in ultraviolet, optical and near-infrared.

  • Small details on our body, like a scar or wrinkles,

  • tell the story of our lives.

  • Similarly, a galaxy's structure in different light

  • can help us trace back their origin and evolution.

  • How do I look for these details?

  • I model the bright central body

  • and remove my model from the image

  • to check for any hidden features,

  • because a bright structure in a galaxy may blind our views of faint features,

  • just like using sunglasses when you are blinded by the intense light.

  • The result was a big surprise.

  • This galaxy doesn't just have an outer ring,

  • it has an additional, diffused inner ring.

  • We were having a hard time explaining the origin of the outer ring

  • in Hoag-type galaxies.

  • Now we also need to explain this mysterious second ring.

  • There is currently no known mechanism

  • that can explain the existence of an inner ring in such a peculiar galaxy.

  • So the discovery of Burçin's Galaxy clearly highlights the gap

  • in our knowledge of galaxy evolution.

  • Further research into how this extremely rare galaxy was formed

  • can provide us with new clues on how the universe works.

  • This discovery tells us that we still have a lot to learn,

  • and we should keep looking deeper and deeper in space

  • and keep searching for the unknown.

  • Thank you.

  • (Applause)

There are more than a trillion galaxies in the universe.

Subtitles and vocabulary

Operation of videos Adjust the video here to display the subtitles

B2 TED galaxy ring outer rare object

A rare galaxy that's challenging our understanding of the universe | Burçin Mutlu-Pakdil

  • 348 23
    Vivian Chen posted on 2018/09/20
Video vocabulary