covers the possibility of manipulating a star to more efficiently
extract the available energy. A typical star burns only several percent
of the hydrogen. When the core hydrogen is exhausted it cools and
reddens so that it enters the red giant phase. The surface expands,
will all suffer Giordano Bruno’s
fate in 1601 when he was burned at the stake in Campo de' Fiori!
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 life
extended, say by controlling luminosity? This could be done by mixing
core, inducing stellar mass loss (60%!), changing pressure by adjusting
the rotation rate, increasing opacity by introducing heavy elements, … These are
not easy astroengineering projects!
are hot, massive stars on the main sequence beyond the AGB turnoff.
Beech suggested some blue straggler stars might be examples of
This had been a mystery but Shara,
et al. showed they could arise in
“intimate” encounters between stars in crowded globular clusters.
This is bad
for planets, life.
A blue straggler is a “natural” example of a grand astroengineering