![]() Stonehenge that aligned with specific astronomical events. They recorded theirĭata on stone tablets or temple walls, and sometimes they even built giant structures like People in ancient Egypt, China, CentralĪmerica, and Mesopotamia conducted these surveys over 5,000 years ago. The positions and motions of stars and planets. In the sky called the north celestial pole. At night, more than 1000 visible stars followed a similar course,Īppearing to rotate in permanent groups, or constellations, around a fixed point It developed inĪncient times from curiosity about day and night, the sun, the moon, and the 940 A.D.Ĭopyright c 1997, The British Library BoardĪstronomy is the oldest of the physical sciences. The earliest moments after the big bang, more than 12 billion years ago, intoĪn ancient Chinese star chart from ca. Learn something about how microscopic matter and energy variations evolved from The SDSS will map theseĬlusters in greater detail than any survey so far. Was created to study how galaxies cluster on the largest scales. This survey, the Sloan Digital Sky Survey (SDSS), We find enough objects, we can study them to derive the basic physical Technique we have for discovering new objects and interactions of objects. Complete, scientific sky surveys are the best Universe, over ever-larger areas, to ever-greater depths, and over an ever-increasing range of wavelengths. These ideas have guided the many projects in the last century to map the So rare that we must look at millions of objects to find just one example. Many structures cover large areas of sky others are These objects, we must first know where to find them, how they interact, and Stars and planets, but also of galaxies, clusters of galaxies, streams andĬlumps of gas, and a component of unseen (or dark) matter. Today, we understand that the universe consists not only of (This important aspect of sky surveys survives today, with examples like the With naked-eye observations, became essential tools for navigation and trade. Helping with agriculture and religious observances. These civilizations used these regular events to mark time, SomeĬivilizations began to realize that certain celestial events repeated at With higher powers beyond their control, such as gods and goddesses. To the ancients, these points of light were often viewed in connection Sky, have always piqued our curiosity as we have sought to The stars and planets, mere points of light in the night Or browse the many interesting sites on the Internet.įor millennia, humans have wondered about the universe Introduction to their reasons, and outlines the history of astronomical Hipparcos Hipparcos Hipparcos Hipparcos Hipparcos Hipparcos Hipparcos هیپارخوس (ماهواره) Хипаркос Hipparcos 依巴谷衛星 Hipparcos Гіппаркос 依巴谷衛星 히파르코스 Hipparcos Tycho katalog Hipparcos Hipparcos Hipparcos Hipparcos היפרכוס (לוויין) Hipparcos Hipparcos Hipparcos Hipparcos Hipparcos Hipparcos ヒッパルコス Hipparcos 依巴谷卫星 Hipparcos Hipparcos Hipparcos ഹിപ്പർകോസ് Hipparcos Hipparcos Hipparcos Hipparcos Hipparcos Hiparcos هيباركوس 依巴谷卫星 Хипаркос satellite de l'ESA rymdteleskop satelita astrometryczny യൂറോപ്യൻ ബഹിരാകാശ ഏജൻസിയുടെ കൃത്രമോപഗ്രഹം астрономический спутник ЕКА Satellit scientific satellite of the European Space Agency Observatorio espacial astrométrico da Axencia Espacial Europea.Why do astronomers map the sky? This page gives a brief
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