covers the possibility of manipulating a star to more
extract the available energy. A typical star burns only
of the hydrogen. When the core hydrogen is exhausted it
reddens so that it enters the red giant phase. The surface
will all suffer Giordano
fate in 1601 when he was burned at the stake in Campo de'
A question to an astrophysicist "So,
what would you do, professor, when
our raging sun is about to fry us?"
Try to mix in unused hydrogen in the outer envelope with
the core. .
With astroengineering could useful stellar
extended, say by controlling luminosity? This could be
done by mixing
core, inducing stellar mass loss (60%!), changing pressure
the rotation rate, increasing opacity by introducing heavy
not easy astroengineering projects!
are hot, massive stars on the main sequence beyond the AGB
Beech suggested some blue straggler stars might be
This had been a mystery but Shara,
al. showed they could arise in "intimate" encounters between stars in crowded
This is bad
for planets, life.
A blue straggler is a "natural" example of a grand astroengineering