This image of the Hale-Bopp comet was taken on March 7, 1997. The comet is
currently as far away from the Sun as our Earth is (1 astronomical unit).
The yellow lines show where the comet has extensive outbursts of dust
from its center or nucleus. This is very unusual because comets normally don't
spew out this much dust at this distance. The image was taken by H Fukushima, M
Takata, and D Kinshita.
National Astronomical Observatory of Japan