[sig226]

[TexasCajun]

I have a question Prof Sig.

After watching a show on the Science channel, showing all the planets in our solar system being in a linear orbit at different distances from the sun, I was wondering if we are unique or are all planetary systems like ours?

I hope that is the right term, linear orbit?

[outofsalt]

Do the grooves appear somewhat like those of sedimentary rock strata, piled higher and deeper?