Jan 29, 2026 08:31 PM
https://bigthink.com/starts-with-a-bang/...-platypus/
INTRO: In the animal kingdom, one of the most bizarre discoveries of all-time was the platypus. When reports of the platypus reached the western hemisphere, most leading naturalists at the time assumed it was a hoax, including the first European scientists to examine a specimen in 1799.
It was an animal that laid eggs, yet it was a mammal. It had the bill of a duck, but the tail of a beaver. It had (at least, the males do) venomous spurs on their hind legs, but also the ability to locate other creatures in the water through a specialized sense known as electroreception, common in sharks but very rare among mammals. And yet, the platypus exists with all of these properties, even if it would take decades (or more than a century) before we understood how such a creature could come to exist.
Astronomers have just encountered a very similar situation by looking at a large suite of data from the James Webb Space Telescope (JWST). We’ve seen all sorts of objects that we understand fairly well: stars, stellar remnants, galaxies, active galactic nuclei, quasars, and so on.
Within all of these categories, there are enormous varieties of properties that individual objects might possess, but there are some general attributes that are common to all of them. So what do you do when, after sifting through the data, you find a significant collection of objects that:
INTRO: In the animal kingdom, one of the most bizarre discoveries of all-time was the platypus. When reports of the platypus reached the western hemisphere, most leading naturalists at the time assumed it was a hoax, including the first European scientists to examine a specimen in 1799.
It was an animal that laid eggs, yet it was a mammal. It had the bill of a duck, but the tail of a beaver. It had (at least, the males do) venomous spurs on their hind legs, but also the ability to locate other creatures in the water through a specialized sense known as electroreception, common in sharks but very rare among mammals. And yet, the platypus exists with all of these properties, even if it would take decades (or more than a century) before we understood how such a creature could come to exist.
Astronomers have just encountered a very similar situation by looking at a large suite of data from the James Webb Space Telescope (JWST). We’ve seen all sorts of objects that we understand fairly well: stars, stellar remnants, galaxies, active galactic nuclei, quasars, and so on.
Within all of these categories, there are enormous varieties of properties that individual objects might possess, but there are some general attributes that are common to all of them. So what do you do when, after sifting through the data, you find a significant collection of objects that:
- are point (or, more accurately, point-like) sources,
- located at great cosmic redshifts,
- that have narrow (rather than broad) emission lines,
- and that don’t fall neatly into any of the known categories of astronomical objects.