“possibly a very faint brown dwarf “
I think if we had a brown dwarf in our solar system we would know it.
“I think if we had a brown dwarf in our solar system we would know it.”
There’s some living in a hole in my garden.
The infrared Webb space telescope has ruled that out.
It easily would have picked up a brown or red dwarf.
Jury is still out on a earth sized or superearth.
I’d almost agree, but scientists now surmise a brown dwarf could be a lot smaller than originally envisaged (most thought it would be slightly bigger than Jupiter, but you never know). If a very faint brown dwarf about the size of Neptune is out there as a faint companion to our Sun, that may explain all the orbital irregularities we’ve seen from the orbits of Neptune, Pluto and the Kuiper Belt dwarf planets.