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.
The friction heats the gases and causes them to glow from the stellar gas falling into the black hole over time. The author argues that astronomers discovered the first black hole shredder stars, using the ROSAT satellite, which was launched in 1990 with the objective of survey the low energy X-ray sky. According with her the calculations based on ROSAT observations show that a galaxy’s central black hole might gobble a close passing star every 100,000 years or so. Gezari provides evidence that when a black hole chows down on tidally disrupted debris, the temperature of the inspiraling gas can climb to 1 million degrees. Also, she argues that Most of the light is X-rays, but a tail of emission extends to longer, ultraviolet and optical wavelengths.
Praesepe or also known as the Beehive Cluster is an open cluster. It is one of the nearest open clusters in our solar system; it also contains the largest population of large stars than most clusters nearby. Under the dark skies at night, the Beehive Cluster looks like a nebulous object to a human’s naked eye.
Solar Nebula Contraction- heats up due to collision, flattens into an elliptical plane, spins faster due to angular ,momentum. Planet Formation: stage 1- a nebula is formed that attracts clumps of dust and gas that grows larger and attracts bigger objects (known as accretion). Stage 2- planetsimals are objects the size of moons that have strong enough gravitation to affect nearby moons, which cause larger bodies to collide and make protoplanets and protoson which are the planets that and now evolved today in our solar system. Stage 3- jovian planets form by two ideas- 1. 4 outer planets become large enough to accrete dust and gas forming gas giants or 2.. instabilities in the cooler region of solar system cause a collapse of initial interstellar cloud.
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.
Radio astronomial investigations of the distribution of hydrogen clouds have revealed that the Milky Way is a spiral galaxy of Hubble type Sb or Sc. Therefore, our galaxy has both a pronounced disk component exhibiting a spiral structure, and a prominent nuclear reagion which is part of a notable bulge/halo component. Decade-long observations have brought up more and more evidence that the Milky Way may also have a bar structure (so that it would be type SB), so that it may look like M61 or M83, and is perhaps best classified as SABbc. Recent investigations have brought up support for the assumption that the Milky Way may even have a pronounced central bar like barred spiral galaxies M58, M91, M95, or M109, and thus be of Hubble type SBb or SBc. More on the
The first telescope was used by Italian Galileo in sixteen hundred and nine; Galileo was able to make out a few fuzzy crates on the moon’s surface. For many centuries after that humans improved on telescopes, building bigger and better telescopes. But eventually building bigger and better telescopes no longer improved our view. Earth’s atmosphere would always distort light, or bend the light rays astronomers could see. The earth’s atmosphere was limiting how far we could see into space, so astronomers decided to bypass the atmosphere.
Looks like a real solar system. It is use to illustrate the relative positions and motions of the planets and other objects/particles in our solar system. The principal components/parts of it are the large bulb that is use to represent the sun which is the center of our solar system ,those round objects as the nine different planets or bodies in orbit the sun and that are bounded by gravity, its body and the stand that support the large bulb. The four small inner objects are use to represent Mercury, Venus, Earth, Mars that are also called terrestrial planets which are composed of rock and metals. There are also four outer objects which are use to serve as the gas giants.
The Maya Civilization and Astronomy The Maya civilization is characterized of being one of the biggest and wisest civilizations of history, who were known of having the only known fully developed written language of pre-Columbian America, and the most advanced Mathematicians and Astronomers. They were mostly characterized for being extraordinary good astronomers who were experts on making observations and recording the motion of the Sun, the Moon, and the stars. Maya’s primary interests were Zenial Passages, when the Sun crossed over Maya latitudes. They were based on an annual basis where the sun travels to its summer solstice at latitude of 23-1/3 degrees north. Since most of the Maya cities were located south, they were able to observe the sun directly overhead while the sun was passing over their latitude.
It has a metallic core which makes up 75% of the planets radius. Radar images taken indicate that the core of mercury is in fact liquid and not solid like earth’s core. The core of mercury has an abundance of iron, much more iron than any other planet. This iron generates a magnetic field around the planet, only one precent as strong as Earth’s magnetic field. This field is said to be active and frequently interrelating with the solar wind and channelling plasma into Mercury’s surface from the sun.