The moon also affects the length of day. With the moon’s gravity constantly pulling on Earth, the earth’s rotation slows down dramatically. This is what gives us our twenty four hour days. If we did not have the moon, Earth would spin fast giving us only eight hour days! That would mean only three to four hours of sunlight per day!
Leavitt completed her research on period/luminosity by 1912 and astronomers such as Hubble, and Shapley have since used her work. “The period/luminosity law became the yardstick by which distances of stars could be measured by astronomers” (Nix, 1998). Without Leavitt’s work, which went unpraised and mostly unrecognised throughout her life, many of the early advances in astronomy would not have happened. References: Mitchell, Helen Buss. 1976.
The ratio of these elements in the world today is strong evidence for the big bang theory. Scientists have observed that galaxies appear to be moving away from us at speeds proportional to their distance. This discovery was named ‘Hubbles Law’ after Edward Hubble, the man who discovered it. This observation supports the expansion of the universe and suggests that it was once compacted/ The Red Shift is also further evidence for the Big Bang theory. Red shift occurs when light radiation moves away from an observer.
The Moons on Mars The planet Mars has two very small moons which were both discovered in 1877 by Asaph Hall. Asaph was determined to find a Martian moon but was becoming frustrated and decided to quit searching. His wife, Angelina, encouraged him to keep looking and the next night, August 12, 1877, he discovered Deimos and six nights later he discovered Phobos. They are among the smallest moons in the solar system. These two moons are also very dark and are thought to be captured asteroids.
At the equator, the Sun's rotation period is 25.05 days. This slows considerably as latitude increases, to 34.3 days at the poles. When viewed from the Earth, using sunspots as a reference, a time of roughly 27 days is observed. This increase is due to the change in position of the Earth in relation to the Sun over the period of observation time. This is referred to as the Synodic rotation period, whereas the former is the Sidereal rotation period.
Life Cycle of a Star Pamela Hughes May 17, 2011 SCI/151 Norman Stradleigh Life Cycle of a Star On a clear dark night, one can see thousands of stars. We can see many stars but could never dream of being able to count them all. Even though each individual star is unique, all stars share much in common. The Sun, which is the source of virtually all light, heat, and energy reaching the Earth, is the nearest star. Today, we know that stars are born from interstellar gas clouds, shine by nuclear fusion and then die, sometimes in dramatic ways.
Johannes Kepler was born on December 27, 1571 in Germany. He was a mathematician, astronomer, and astrologer. He was most famous for his eponymous laws of planetary motion. Based on his work on Astronomia nova, Harmonicies Mundi, and Epitome of Copernican Astronomy it provided a foundation for Issac Newton’s theory of universal gravitation. Early Life Johannes Kepler was born on December 27, 1571 which was also the same day as feast day of St. John the Evangelist.
The reason why calculating stars distance is difficult because the earth’s revolution around the sun stars shifts their position. To overcome these challenges, an international team of astronomers, led by Hervé Bouy from the Max Planck Institute, Garching, Germany and the Observatoire de Grenoble, France, were able for the first time measure the mass of an ultra-cool brown dwarf star. The team performed the measurements using four of the most powerful telescopes available. That was the first-ever mass measurement of an L-type star belonging to the new stellar class of very low-mass stars, discovered a few years ago. With a mass of 6.6% of the solar mass, this celestial object is observed to be lying between stars and planets in the evolutionary scheme.
Also, she argues that Most of the light is X-rays, but a tail of emission extends to longer, ultraviolet and optical wavelengths. Other example provided by the author is the Galaxy Evolution Explorer known as GALEX. This is a telescope launched in 2003, observes ultraviolet radiation, but according with Gezari the use of the GALEX to search among galaxies and find tidal disruption was a good idea because the astronomers found the three luminous ultraviolet flares coming from normal-looking galaxies. The author proves that the three flares came from gas glowing at
Mercury is the innermost and smallest planet as well as having the most eccentric orbit the eight planets in our Solar System. Mercury’s terrain is rocky and heavily cratered closely resembling Earth’s moon, having no atmospheric protection against meteoroids or debris colliding with the surface, causing huge dents. The outer crust of mercury is believed to be very thin, much thinner than earths, its shell only being 500 to 600 km thick. It has been found that Mercury is the second densest planet of our solar system, earth being the first. It has a metallic core which makes up 75% of the planets radius.