who discovered cepheid variable stars?
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Leavitt is best known for discovering about 2,400 variable stars between 1907 and 1921 (when she died). She discovered that some of these stars have a consistent brightness no matter where they are located, making these so-called Cepheid variables a good measuring stick for astronomical distances.
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The easiest constellation to find is the Little Dipper. It's shaped like a bowl with a handle. Along the handle, you'll find the brightest star. That's the North Star and the end of the constellation itself.
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Cygnus was among the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations. Cygnus contains Deneb (ذنب, translit.
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In fact, archaeological studies have identified markings in the famous cave paintings at Lascaux in southern France (ca. 17,300 years old) that could be depictions of the Pleiades cluster and Orion's Belt. There are currently 88 officially recognized constellations in total, which together cover the entire sky.
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First Arc Lamp Is Created Humphry Davy demonstrated the first incandescent light to the Royal Institute in Great Britain, using a bank of batteries and two charcoal rods.
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Under What Star Was I Born? The "fixed stars" of ancient astronomy / astrology are the subjects of many legends. This simple program tells which one of the brightest popularly-named stars was closest to being directly overhead at the time and place of your birth.
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['Aries, the Ram. Till Credner, allthesky.com. ... ', 'Cancer, the Crab. Starry Night Software. ... ', 'Gemini, the Twins. Starry Night Software. ... ', 'Libra, the Scales. Stellarium. ... ', 'Ophiuchus, the Snake Bearer. Starry Night Software.']
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Another asterism is the "Teapot" in the constellation of Sagittarius, as well as the "Summer Triangle", spanning an area from the stars Vega, Altair and Deneb in the constellations Lyra, Aquila and Cygnus respectively.
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Mythology. As is the case with all of the Zodiac constellations, Ophiuchus was recorded in the 2nd century by the Greek astronomer Ptolemy, and the name is Latin for "serpent bearer."
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['Kimah, the Pleiades.', 'Kesil, Orion.', 'Ash, or Ayish, the Hyades.', 'Mezarim, the Bears (Great and Little)', 'Mazzaroth, Venus (Lucifer and Hesperus)']
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Tonight after sunset look to the West and find brilliant Venus. Just above the planet is a small cluster of stars called the Pleiades or Seven Sisters. Located in Taurus the Bull, this little cluster is easy to see.
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Although no supernova has been observed in the Milky Way since 1604, it appears that a supernova exploded in the constellation Cassiopeia about 300 years ago, around the year 1667 or 1680.
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Tycho Brahe, (born December 14, 1546, Knudstrup, Scania, Denmark—died October 24, 1601, Prague), Danish astronomer whose work in developing astronomical instruments and in measuring and fixing the positions of stars paved the way for future discoveries.
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['Constellation. Legends.', 'by. Norm McCarter.', 'Andromeda – The Chained Lady.', 'Aquarius – The Water Bearer.', 'Aquila – The Eagle.', 'Aries – The Ram.', 'Auriga – The Charioteer.', 'Bootes – The Bear Driver.']
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How are constellations named? Most of the constellation names we know came from the ancient Middle Eastern, Greek, and Roman cultures. They identified clusters of stars as gods, goddesses, animals, and objects of their stories.
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['Anton Van Leeuwenhoek. *Dutch scientist. ... ', 'Robert Hooke. *Looked at cork under a microscope. ... ', 'Matthias Schleiden. *1838-discovered that all plants are made of cells. ... ', 'Theodore Schwann. *1839-discovered that all animals are made of cells. ... ', 'Ruldolf Virchow. * Lived from 1821-1902.']
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American astronomer Edwin Hubble (who the Hubble Space Telescope is named after) was the first to describe the redshift phenomenon and tie it to an expanding universe. His observations, revealed in 1929, showed that nearly all galaxies he observed are moving away, NASA said.