Interesting fact for #science #astronmy and #sciencefiction #writers and #authors. A Jupiter-class planet does not get proportionally wider with greater mass, it gets denser and maybe a little wider. Red dwarfs, which are what happens with a Jupiter-class planet gets massive enough the fuse deuterium, may actually be less wide than Jupiter. One such example is 61 J-mass but .89 J-radius!

You want to get this correct. I've read articles that conflate mass and radius, and that renders the article ridiculous. Here is a very interesting article on the subject here:

https://www.sciencealert.com/jupiter-sized-cannonball-planet-discovered-with-a-density-greater-than-lead

Why bring this up? A furnace-hot brown dwarf with an angry red glow is front and center (or in the middle of) one of my #sff stories. Would worlds orbiting it be planets or moons?

#nonfiction #fiction #writing #writer #writingcommunity #exoplanets #BrownDwarfs

#astronomy #planets #exoplanets #BrownDwarfs An article published in "The Astrophysical Journal" reports the discovery of an object orbiting BD+60 1417, a young star a little smaller than the Sun, which could be a gas giant planet but also a small brown dwarf.

https://english.tachyonbeam.com/2021/12/14/an-object-on-the-border-between-planet-and-brown-dwarf-discovered-in-the-cosmic-neighborhood/

#astronomy #BrownDwarfs #TheAccident An article published in "The Astrophysical Journal Letters" reports a study on the brown dwarf classified as WISEA J153429.75-104303.3, or simply WISE 1534–1043, nicknamed the Accident because it was discovered purely by chance.
https://english.tachyonbeam.com/2021/09/03/a-brown-dwarf-nicknamed-the-accident-is-passing-through-the-cosmic-neighborhood/

#astronomy #BrownDwarfs #stars An article published in the journal "Astronomy & Astrophysics" reports a study on 5 objects on the boundary between brown dwarf and star discovered thanks to NASA's TESS space telescope.
https://english.tachyonbeam.com/2021/09/01/5-objects-on-the-boundary-between-brown-dwarf-and-star-have-been-discovered/

So cool. These brown dwarfs are spinning so fast, gravity at their equator feels almost like on Earth, while at the poles it's over 100g!

https://www.syfy.com/syfywire/if-these-brown-dwarfs-spun-much-faster-theyd-tear-themselves-apart

Hal Clement would have loved this [ https://en.wikipedia.org/wiki/Mission_of_Gravity ].

#BrownDwarfs #SurfaceGravity