Well, here's the thing: comets have crazy, irregular orbits. Because of this, they're likely relics leftover from when the solar system formed. So they probably haven't changed much in the last 4 billion years or so. If we anayze what they're made of, it can give us a clue to the composition of matter back when the solar system first formed, which can give us clues about how things have changed since then, and how they might change again.
We expect the only Halley's Comet there is to return to the inner solar system in 2061. That means it'll get close enough to the sun so that we can see it, but we can't tell yet exactly how close to earth it's likely to get.
They tell us the age of the moon, which indicates when the Solar System itself was being formed.
How the solar system made
The Solar System doesn't tell time; we tell time, based on the movement of objects in the sky. Basically the time is based on the position of the Sun in the sky.
That depends on what you mean by "this".
That would be an Astrolabe.
I thought Halleys comet was every 78 years, hang on, I'd better check, I remember NOT seeing it last time it came around & I thought that was in 1988 ! I was close ! 75 to 76 years is the return, so it was say 1976 when I saw it (Not)+75 years, you got to wait until 2061 or so, I wont be around to tell you to look up !
it is how the solar system started
This question is not quite answerable, although I can tell you that our solar system is on one of the outer rings of the milky way. There is no way to determine how our solar system ended up in the milky way, it just wound up there!
The best way to tell the difference is by tracking the object. If the object seems to move in an orbit around the Sun, then it is in the solar system. If not, it is outside it.
yes, according to many scientists the solar system will become inbalanced and collapse in a few million years(only time will tell)
Away from the sunThe Tail of a Comet always points Away from the Sun.