00449nam a22001457a 4500008004100000020001500041050002000056100002800076245005700104250001100161260003300172300003300205500005100238650001400289170124b        xxu||||| |||| 00| 0 eng d  a0534189369  aQB 45 .S44 1993  aSeeds, Michael A.d1993  aHorizons /bExploring the UniversecMichael A. Seeds  a4th ed  aCaliforia:bWadsworth,c1993  axxiii, 482 p.:bill.;c28cm.  aincludes bibliographical references and index.  2Astronomy