As an example
of changes and signs of planetary activity within a stars disk,
Beta Pictoris is a young star that shows signs of such planet formation.
The observations on the right, taken in the
mid-infrared, reveal a higher concentration of fine particles of
dust, rock and ice in one region of the disk. The debris has given
the disk around the star a lopsided appearance. This suggests a
collision between large bodies of rock and ice.
This particular crash is thought to be of
equivalent size to the incident that many believe occurred to this
Earth and created the moon.
Given the amount of material within the dusk
and the fact that Beta Pictoris is a young star, and in relation
to the alternative concept of this website, I think the collision
may also be the birth of a Roaster, an early bloated gas giant,
which will begin to carve away and refine the disk, thus starting
to clear that system's ecosphere.
( It is widely believed that a Mars sized
body ran into what would become the Earth, and the moon was formed
from the resulting debris, but this idea is also built on the acceptance
of Accretion as the main planet forming process. To see the role
that this collision plays in the proposed life cycle of an Earth
on this website, see ‘Shield
Re-Assembly’ through to ‘Object
in the Interior’ and
‘Mercury’, in ‘The Visible Earths’ section