fwd: Interesting astrographic features
From: "Oerjan Ohlson" <oerjan.ohlson@t...>
Date: Thu, 23 Mar 2000 21:03:24 +0100
Subject: fwd: Interesting astrographic features
Laserlight sent me this:
> Oerjan, would you mind to forward this to The List?--Laserlight
>The UKIRT survey of the Trapezium Cluster in the Orion Nebula turned
>up more than 100 brown dwarfs - objects that might have become >stars,
but never accumulated sufficient material. With less than 8 >percent of
the sun's mass, such objects don't generate enough internal >heat to
trigger the nuclear reactions involving hydrogen that keep stars
>shining over long periods.
>Nevertheless, scientists say even brown dwarfs produce some nuclear
>energy for a short time (from deuterium, a rare isotope of hydrogen)
if >their mass exceeds 1.3 percent the sun's mass - about 13 times the
>mass of Jupiter. Thus, astronomers have generally defined this as the
>minimum mass for a brown dwarf.
>The new infrared survey turned up 13 objects below that
13-Jupiter->mass threshold. The mass of the smallest was estimated at
to no more >than about eight Jupiters.
>The researchers dubbed these objects "free-floating planets."
"Life is like a sewer.
What you get out of it, depends on what you put into it."