40 CCDs of the MegaCam wide-field camera: design and first tests of the front-end electronics

40 CCDs of the MegaCam wide-field camera: procurement, testing, and first laboratory results

40 Eridani and the gravitational lens effect

40 Eridani.

40 Eridani: The Vulcan Sun as a Benchmark for the Evolutionary Properties of White Dwarfs and Cool Stars

40 field red supergiants in the SMC (Meliani+, 1995)

40 Harmonia CCD Spectrum

40 Jahre Astronomieunterricht in Ostdeutschland.

40 KG Sample of Fish-Clay from Stevns Klint, Denmark

40 neue Veränderliche

40 New Southern Red Variables

40 previously unreported variable stars in the OGLE-II database

40 Signs of Supermassive Black Hole Binaries

40 YEARS OF PULSARS: Millisecond Pulsars, Magnetars and More

40 Years of Pulsars: The Birth and Evolution of Isolated Radio Pulsars

40 Years of Solar Microwave Burst Flux Measurements

40 years of the astronomical contest for schoolchildren.

40 years of whistlers

40 Years Since Gagarin's Flight to Space. (Slovenian Title: 40-letnica Gagarinovega poleta v vesolje)

40, 000 years of extinctions on the ``planet of doom''