Sentences with phrase «sustained hydrogen fusion»

And in the past several years, disks seemed equally likely around brown dwarfs: gaseous balls less than 75 times the mass of Jupiter, unable to ignite sustained hydrogen fusion.

Brown dwarfs are not considered stars because they are too small to fuse hydrogen in their cores — they don't have the gravitational oomph in their core to sustain hydrogen fusion, but, depending on how massive they are, they do have enough mass to sporadically fuse elements like lithium and deuterium.

It is frequently applied to the coolest objects, including K - and M - dwarfs, which are true stars, and brown dwarfs, often referred to as «failed stars» because they do not sustain hydrogen fusion in their cores.

Not exact matches

With no nuclear fusion to sustain them, they collapse into Earth - size balls of tightly bound carbon and oxygen nuclei with an outer layer of hydrogen plasma (disrupted atoms).

But Michael Skrutskie, a University of Virginia astronomer and a member of the WISE science team, is especially interested in the satellite's ability to pick out previously unknown brown dwarfs, objects larger than planets but too small to sustain nuclear fusion of hydrogen.

The outward pressure from fusion counteracts the inward pressure from gravity and an equilibrium point was reached where they are equal and opposite in force and the sun has a relatively stable diameter that will persist until it starts running out of hydrogen fuel to sustain the outward pressure.