formation of planet
Answers
Answer:
Plants produce new tissues and structures throughout their life from meristems[1] located at the tips of organs, or between mature tissues. Thus, a living plant always has embryonic tissues. By contrast, an animal embryo will very early produce all of the body parts that it will ever have in its life. When the animal is born (or hatches from its egg), it has all its body parts and from that point will only grow larger and more mature.
The properties of organization seen in a plant are emergent properties which are more than the sum of the individual parts. "The assembly of these tissues and functions into an integrated multicellular organism yields not only the characteristics of the separate parts and processes but also quite a new set of characteristics which would not have been predictable on the basis of examination of the separate parts."[2]
Answer:
Slowly at first, violently towards the end.
4.5 billion years ago, there was a cloud. The Proto Solar
System if you will. Much of its mass was hydrogen and
helium, left over from the earliest stages of the
universe; this ultimately became sun-fuel. But some of
it, around 2%, consisted of heavier stuff, ejected matter
from dead stars... it was all a big rubbish tip in space.
Something, possibly a nearby supernova, caused this
nebula to collapse in on itself; at the centre was the
baby sun, which became so dense that nuclear fusion
began, and as the nebula collapsed inwards it swirled
around this dense, central region faster and faster.
Over time, this nebulous garbage began to clump
together, and their combined gravity attracted other bits
and pieces from around their little corner of the Proto
Solar System, and they grew bigger still. Soon (well,after millions of years) these bundles of rock had
sufficient gravity to hoover up everything around them,
growing at an exponential rate. Eventually, they became
so massive that their own gravitational forces crushed
them into spheres, and the intense pressures and the
friction from heavier elements falling down into the core
caused them to be helish worlds with molten cores.
Meanwhile their surfaces were pelted with asteroids
and other, smaller, failed planets as debris was hurled
all over the place in nature's ultimate pinball game.
Some of these baby planets became so dense and
massive that they could sustain colossal atmospheres,
and they became the gas giants. So massive were the
Jovian worlds, thanks to their location beyond the 'frost
line' (the point far enough away from the sun that
allowed them to accumulate more abundant ice
matetial) that they may have torn apart other planets
and consumed them too. Others weren't so massive,
and their molten surfaces crusted over as they
gradually cooled, trapping the heat of their molten cores
inside.
After around 10 million years, the solar system as we
know it would have largely stabilised, the planets having
eaten pretty much everything they could get their gravity
wells around and the spry young son having blown away
most of the remaining gasses with its powerful solar
winds. Jupiter acted like the bouncer, keeping the
remains that nobody wanted in check, forming the
asteroid belt. They all continued to spin around the
central mass, their momentum preserved from that
swirling garbage nebula so long ago, and their orbits
settled on a single plane. Except for Pluto, because
Pluto is like that. But then, that's one
reason it got demoted.
Imagine a huge sheet of fabric stretched out with
thousands of marbles thrown across it. Each marble
makes a dent in the fabric. If another marble falls into
that dent, it will deepen and other marbles will fall into it
too. The deeper the dent gets, the more marbles fall into
it, and the faster they do so. In a very rudimentary,
superficial way, this is how the planets formed.
bye meow