20 - 33 μ Photometry of Cool Stars
20 CVn, a monoperiodic delta Scuti star
20 CVn, a monoperiodic Delta Scuti star.
20 Jahre Raumstation SKYLAB. Erste bemannte Raumstation der USA.
20 Kometenfragmente stürzten auf Jupiter.
20 new variable stars in Harvard Map, No. 49
20 new variable stars in Harvard Map, Nos. 2, 5, 32, 44 and 53
20 things to see in the summer sky
20 things to see in the winter sky
20 to 40 micron spectroscopy of the Orion Nebula
20 years of Astronomy Now, 20 years of great astronomy
20 μm Observations of IRAS 10214+4724: Identification with a z=2. 3 Galaxy Remains Unconfirmed
20-200 keV observations of binary X-ray sources with a balloon-borne payload
20-65 Micron Spectroscopy of Oxygen-Rich Stars and Eta Carinae: New Far-Infrared Circumstellar Dust Emission Features
20-Micron Photometry
20-micron photometry.
20-micron transparency and atmospheric water vapor at the Wyoming Infrared Observatory
200,000 variable star observations
200-μm ISO observations of NGC 6946: evidence for an extended distribution of cold dust
2000 A UV imaging of a 6 deg diameter field around MU Aurigae