The world according to the Hubble Space Telescope Mario Livio∗ Space Telescope Science Institute, Baltimore, MD 21218 (Dated: February 2, 2008) Abstract The Hubble Space Telescope (HST), in its thirteen years of operation, has allowed us to observe properties of the universe humans have been able, until very recently, to probe only with their thoughts. This review presents a brief summary of a few of the highlights of HST discoveries, discusses their physical implications, and identifies unsolved problems. A broad range of topics is covered, from our own solar system to cosmology. The topics fall into the general categories of: planets (including both in the solar system and extrasolar), stellar evolution, black holes (including both of stellar-mass and supermassive), galaxy formation and evolution, the determination of cosmological parameters, and the nature of the recently discovered “dark energy.” arXiv:astro-ph/0303500v1 21 Mar 2003 ∗
[email protected]; http://www-int.stsci.edu/~mlivio/ 1 Contents I. INTRODUCTION 4 II. OUR OWN BACKYARD—THE SOLAR SYSTEM 5 A. The collision of Comet SL-9 with Jupiter 6 III. EXTRASOLAR PLANETS 9 A. Where have all the planets gone? 9 B. The transiting planet HD 209458 13 IV. STARS AT BIRTH AND DEATH 15 A. Outflows and jets from young stellar objects 15 B. Protoplanetary disks 17 C. Morphology of stellar deaths 18 V. BLACK HOLES—FROM SUPERMASSIVE TO STELLAR 25 A. Search techniques for supermassive black holes 26 B. The M BH – σ relationship 27 C. Intermediate-mass black holes? 29 D. Gamma-ray bursts 32 VI. DEEP FIELDS AND A BRIEF COSMIC HISTORY 35 A.