00500nam a22001217a 4500020002400000082001600024100006600040245003600106260004600142300003600188500002000224650013400244  a9788120340718 (pbk)  a523.01bBAS  aBasu, BaidyanathaTanuka ChattopadhyayaSudhindra Nath Biswas  aAn introduction to astrophysics  aDelhibPHI Learning Private Limitedc2019  axviii, 582 p.b: ill.c; 23 cm.  aIncludes index.  aAstrophysicsaPhysics vAstronomical instruments vBio-AstronomyvVariable stars vCosmology vMagnitude vGalaxy vMotionvRICAS