Persian astronomer Abd al-Rahman al-Sufi (903–986), known as Azophi to Westerners, made the first known observation of a group of stars outside of the Milky Way, the Andromeda galaxy.
Dutch scientist Christiaan Huygens (1629–1695) proposed the earliest theory about the nature of light, a phenomenon that puzzled scientists for hundreds of years. His improvements on the telescope allowed him to make the first observations of Saturn's rings and to discover its largest moon, Titan. Developing improved telescopes, Huygens was able to.
In ancient Greece, astronomer and mathematician Claudius Ptolemy (A.D. 90–168) set up a model of the solar systemin which the sun, stars, and other planets revolved around Earth. Known as the Ptolemaic system, it remained in place for hundreds of years, though it turned out to be flat wrong. According to NASA, "Ptolemy represents the epitome of kno.
When most people believed the world was flat, the notable Greek mathematician, astronomer and geographer Eratosthenes (276–195 B.C.) used the sun to measure the size of the round Earth, according to NASA. His measurement of 24,660 miles (39,690 kilometers) was only 211 miles (340 km) off the true measurement.
Born in Italy, Galileo Galilei(1564–1642) is often credited with the creation of the optical telescope, though in truth he improved on existing models. According to the Rice University's Galileo Project, "Galileo made his first telescope in 1609, modeled after telescopes produced in other parts of Europe that could magnify objects three times. He c.
Italian astronomer Giovanni Cassini(1625–1712) measured how long it took the planets Jupiter and Mars to rotate. He also discovered four moons of Saturn and the gap in the planet's rings. When NASA launched a satellite to orbit Saturn and its moons in 1997, it was fittingly dubbed Cassini.
English astronomer Sir Isaac Newton (1643–1727) is most famous for his work on forces, specifically gravity. Building on the work of those who had gone before him — he is quoted as saying, "If I have seen further, it is by standing upon the shoulders of giants" — he calculated three laws describing the motion of forces between objects, known today .
Using detailed measurements of the path of planets kept by Danish astronomer Tycho Brahe, Johannes Kepler (1571–1630) determined that planets traveled around the sun not in circles, as Copernicus had thought, but in ellipses. In so doing, he calculated three lawsinvolving the motions of planets that astronomers still use in calculations today. Howe.
In 16th century Poland, astronomer Nicolaus Copernicus (1473–1543) proposed a model of the solar system that involved the Earth revolving around the sun, according to NASA. The model wasn't completely correct, as astronomers of the time struggled with the backwards path Marssometimes took, but it eventually changed the way many scientists viewed th.
The astronomer (also mathematician, physicist and philosopher) turned the new observational tool toward the heavens, where he discovered the four primary moons of Jupiter (now known as the Galilean moons), as well as the rings of Saturn .
An astronomer is a scientist in the field of astronomy who focuses their studies on a specific question or field outside the scope of Earth.They observe astronomical objects such as stars, planets, moons, comets and galaxies – in either observational (by analyzing the data) or theoretical astronomy.
Here’s our alphabetical list of the most popular astronomers, or contributors to astronomy, astrophysics, or cosmology on the Famous Scientists website, ordered by surname. Luis Alvarez 1911 – 1988. The iridium layer, dinosaur death by meteorite impact, and subatomic particle discoveries. Anaximander c. 610 BC – c 546 BC.
Johannes Kepler was an astronomer. He originally studied to be a theologian at the University of Tübingen. He became very interested in astronomy,...
Johannes Kepler is best known for his three laws of planetary motion. These laws are:
Johannes Kepler and his laws were a great influence on Isaac Newton. Newton came up with a law of gravity, which states that masses attract each ot...
Johannes Kepler was born on December 27, 1571, in the town of Weil der Stadt in the duchy of Württemberg, now in Germany.
After contracting a fever, Johannes Kepler died on November 15, 1630, in Regensburg, in the duchy of Bavaria, now in Germany. He had gone to Regens...
The Lowndean chair of Astronomy and Geometry is one of the two major Professorships in Astronomy and a major Professorship in Mathematics at Cambridge University.It was founded in 1749 by Thomas Lowndes
An astronomer from Overton in Cheshire.
Federally funded research and development center for radio astronomy
The National Radio Astronomy Observatory (NRAO) is a federally funded research and development center of the United States National Science Foundation operated under cooperative agreement by Associated Universities
Inc. for the purpose of radio astronomy.NRAO designs
BuildsAnd operates its own high-sensitivity radio telescopes for use by scientists around the world.
Vast empty spaces between filaments with few or no galaxies
Cosmic voids are vast spaces between filaments
Which contain very few or no galaxies.The cosmological evolution of the void regions differs drastically from the evolution of the Universe as a whole:
There is a long stage when the curvature term dominates
Which prevents the formation of galaxy clusters and massive galaxies.Hence
Although even the emptiest regions of voids contain more than ~15% of the average matter density of the Universe
The voids look almost empty to an observer. \nVoids typically have a diameter of 10 to 100 megaparsecs ; particularly large voids
Defined by the absence of rich superclusters
Are sometimes called supervoids.They were first discovered in 1978 in a pioneering study by Stephen Gregory and Laird A.Thompson at the Kitt Peak National Observatory.
