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Since its origins, the human species has observed the sky. First, directly, then with increasingly powerful telescopes. Now, with many electronic means.
Ancient civilizations grouped the stars into figures. Our constellations were invented in the eastern Mediterranean about 2,500 years ago. They represent animals and myths of the place and the time. People believed that the bodies of heaven influenced the lives of kings and subjects. The study of the stars mixed with superstitions and rituals.
The constellations that accompany the trajectory of the Sun, the Moon and the planets, in the strip called zodiacThey are familiar to us because they appear in the horoscope: Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius and Pisces.
At the beginning of the 17th century the telescope was invented. First lenses were used, then mirrors and also combinations of both. There are currently very high resolution telescopes, including groups of several telescopes that work together, synchronized.
Radio telescopes detect radiation of very different wavelengths. They work in groups using a technique called interferometry.
Photography, computer science, communications and, in general, the technical advances of recent years have greatly helped astronomy.
The Hubble Space Telescope (HST), located in orbit, captures and sends images and data without distortion caused by the atmosphere.
Thanks to the spectra, produced by the decomposition of light, we can know detailed information about the chemical composition of an object. It also applies to the knowledge of the Universe.
A recent finding, gravitational lenses, takes advantage of the fact that objects with mass can deflect light rays. If a group of bodies with the appropriate configuration is located, it acts as a very powerful lens and shows, in the center, distant objects that we could not see.
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