objects out there, and in 2006 decided that

Pluto didn't count after all. So we invented the

name "dwarf planet" for all those objects. Shame!

on far away planets that we haven't discovered yet?

and

what is it now

In Chemistry we learn about the Periodic Table and why

it's that shape - because the elements all fit together in 

a sequence with no gaps.

Having said that, there may well be very heavy elements

"off the far end" of the table. But nearly all of them would 

be very unstable and therefore very rare.

The Earth is mainly molten, with a very thin

solid skin (think of the skin on a hot rice

pudding). Anything that splits that skin is bad news.

The smallest is a red dwarf called OGLE-TR-122b.

nuclear fusion to make Helium, and releasing

HUGE amounts of energy as it does so.

is it just because it would take too long?

you count "solar wind" - streams

of high-energy particles from

the Sun.

The word "universe" means "everything",

so you could say the answer is no.

Even if we could, it would take a LONG

time to get to the edge - if it even has

an edge.

There might be other universes. But we don't

really know what that statement means!

(including Earth) would be lumps

of cold rock in the middle of nowhere.

would it still have an atmosphere or would the pieces have there own atmospheres?

orbits. Sometimes it's closer, sometimes further

away. Also, you wouldn't go in a straight line.

crackers to go with it.

to some gases

Occasional stars, occasional dust and gas clouds.