For this week's Sunday Stamps theme of astronomy I have dug out this First Day Cover from 1986, commemorating Halley's Comet.
To celebrate the return of the comet in 1986, the Royal Mail issued four commemorative stamps ...
17p - Dr Edmond Halley as a Comet
22p - Giotto Spacecraft approaching Comet
31p - Twice in a Lifetime
34p - Comet orbiting Sun and Planets
First Day Cover of Halley's Comer, c.1986