Jupiter

[Daisho]

Is Jupiter a brown dwarf?

Is it possible that it is a failed star, that was simply not heavy enough to collapse?

[landie]

No, you're thinking of Grumpy.

[bernardo]

Yes-ish - if it were much bigger, it would be heavy enough and hot enough to start its own fusion processes and be a little star.  As it is, it generates a bit of its own heat already, but not enough to be a star.

[Cloned]

This is true because most solar systems have two suns. We r quite rare in the fact we only have one sun

[adydb]

cloned, what solar systems have 2 suns?...A question not and argument?

[jake-the-peg]

Have you been moolighting on the NASA question page? :c)

 

http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/9801 22c.html

[LeMarchand]

Re Solar Systems with 2 suns, I'm pretty sure that a number of binary systems have been identified.

[LeMarchand]

(I did think that binary systems were fairly rare, though.)

[jake-the-peg]

Multiple star systems are pretty common - only 14% of stars are not in multi-star systems that's why people have been keen to find planets in multi-star systems.

The first real find was a couple of years back

http://mcdonaldobservatory.org/news/releases/2002/1009.h tml