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1 BCE
big bang
UNA EXPLOSION CON LA QUE INICIA EL UNIVERSO -
Galileo begins experiments
Galileo begins experiments with falling and rolling bodies. Galileo's experiments led him to conclude that once something is set in motion it will remain in motion unless something stops it. This contradicted earlier ideas that said only rest was a natural state. -
Galileo uses telescope for astronomical observations.
Galileo uses telescope for astronomical observations. Galileo didn't invent the telescope but he was among the first to use a telescope to examine the heavens. He carried out important observations of the Sun, Moon, Planets, and Stars. -
Galileo observes Moon.
Galileo observes Moon. Galileo found that the Moon had mountains, valleys, and plains like the Earth. He called the dark regions of the Moon maria, the Latin word for seas. -
Kepler discovers laws of planetary motion
Kepler discovers laws of planetary motion. Working with Tycho's observations, Kepler discovers the shapes of planetary orbits, how the speed of a planet varies as it orbits the Sun, and the relationship between orbital distance and orbital period -
Galileo observes phases of Venus
Galileo observes phases of Venus. Galileo's found that Venus shows all the phases from new to full. This observation was incompatible with the Ptolemaic model of the solar system. -
Galileo discovers four largest satellites of Jupiter
Galileo discovers four largest satellites of Jupiter. Galileo found that Jupiter is orbited by four large satellites, now called, collectively, the Galilean satellites. This proved that at least some celestial bodies didn't orbit the Earth -
Galileo publishes "The Dialogue
Galileo publishes "The Dialogue". The Dialogue, although superficially a balanced debate about the merits of the geocentric and heliocentric models of the solar system, was in fact a powerful argument for the ideas of Copernicus. Galileo was brought before the Inquisition and spent the last nine years of his life under house arrest. -
Newton discovers law of universal gravitation
Newton discovers law of universal gravitation. When Cambridge University was closed by the plague, Newton spent most of the next two years at his family farm. During this period he made fundamental discoveries in optics, discovered the law of universal gravitation, and invented differential and integral calculus. -
James Gregory makes the first realistic estimate of the distances of the stars.
9.-James Gregory makes the first realistic estimate of the distances of the stars. Gregory assumed that the other stars were just as bright as the Sun and then calculated how distant they had to be to match their apparent brightnesses -
Newton publishes "Principia
Newton publishes "Principia". Newton's monumental work described his discoveries about gravity, motion and the orbits of the planets -
Calculations of Adams and Leverrier lead to discovery of Neptune
Calculations of Adams and Leverrier lead to discovery of Neptune. Adams and Leverrier independently calculated the location of the unknown planet, Neptune, that was required to explain discrepancies in the orbit of Uranus -
Albert Einstein explains the photoelectric efect
Albert Einstein explains the photoelectric efect. Einstein explained that the emission of electrons only by light at short wavelengths occurs because light consistes of bundles of energy called photons. -
Albert Einstein's general theory of relativity
Albert Einstein's general theory of relativity. Einstein explained that matter curves space, causing bodies to move in ways we attribute to gravity. -
Vikings land on Mars
Vikings land on Mars. The two Viking landers safely touched down on Mars's surface and, for several years, returned images of the surface, as well as meteorological and seismic data. The Vikings also carried life-detection experiments. -
Observations from a spacecraft orbiting Mars
Observations from a spacecraft orbiting Mars suggest large deposits of ice may lie below the Martian surface -
Going mars
They are planning an expedition to Mars
