The solid line shows the steady growth in the total
collecting area of ground-based optical telescopes, including,
arbitrarily, the commissioning of a
30-m (CELT?) in 2010,
and a 100-m (OWL?) in 2020.
The plot is incomplete for
older telescopes <= 1.5 m in diameter.
The data are well-fitted by
exponential growth with a doubling time
of about 8 years (dashed line).
This suggests that by
the earth's entire surface will
be covered with telescope mirror, which will help a lot
with global warming.
This plot was last updated 2002.