Rajaa
Hakutulokset: 9780387095127
Rajaa
yksi hakutulos.
The Greatest Comets in History
nidottu,
2008,
englanti,
ISBN 9780387095127
Naked-eye comets are far from uncommon. As a rough average, one appears every 18 months or thereabouts, and it is not very unusual to see more than two in a single year. The record …