Is the following statement true about molecular clouds in the Milky Way: molecular clouds can be a light year across or longer, Is the following statement true about molecular clouds in the Milky Way: molecular clouds can collapse due to their own gravity, Is the following statement true about molecular clouds in the Milky Way: molecular clouds can contain a million solar masses of gas or more, Is the following statement true about molecular clouds in the Milky Way: molecular clouds are observed mainly using visible light, Is the following statement true about molecular clouds in the Milky Way: molecular clouds are composed mainly of dust, Is the following statement true about molecular clouds in the Milky Way: molecular clouds are supported by pressure from nuclear reactions. because of the fusion reactions that occur inside its core; 4 hydrogen atoms fuse into 1 helium atom and He has slightly less mass than 4 H. This is due to the fact that heat/energy is lost/given off as a photon of light. In a spontaneous fusion reaction, the total mass of the products is ________________________ the mass of the original elements. In 2009 at solar minimum, there were only 3 sunspots visible during the year. Consider a protostar that will eventually evolve into a star similar to the Sun. Matter is packed so tightly that a sugar-cube-sized amount of material would weigh more than 1 billion tons, about the same as Mount Everest! Aldebaran is a K5III giant star based on the spectral type that was recorded in the Hipparcos star catalogue. Stage in which a star has used up its helium and its outer layers escape into space, leaving behind a hot, dense core that contracts, Star that results when a white dwarf stops giving off energy, a nebula that was once thought to be a star with its planets but is now thought to be a very hot star surrounded by an expanding envelope of ionized gases that emit a fluorescent glow because of intense radiation from the star, A sudden eruption of intense high-energy radiation from the sun's surface. Main Sequence stars are young stars. Aldebaran is a Giant Star type star. T-Tauri phase. ), process in which 1 larger atom splits into two smaller atoms. Long Period Variable stars or LPVs contain 2 classes: Mira LPV which are red giants at 80 - 100 pulsation periods and Irregular LPVs with period determination hard to determine due to irregularity. What is the density of this stone? What are the characteristics of an open cluster of stars? why does the sun's mass decrease with each second? T Tauri is a variable star in the constellation Taurus, the prototype of the T Tauri stars. T Tauri stars (TTS) are a class of variable stars that are less than about ten million years old. what class of stars are located in the lower left corner of an HR diagram? T or F main sequence is the longest stage of a star's life, T or F main sequence is the shortest stage of a star's life. Which of the following methods is used to detect molecular hydrogen clouds in the interstellar medium? The photosphere is the thin layer of gasfrom which Earth receives most of the sun's light. Oh no! T Tauri stars have been observed to brighten noticeably in a short period of time, consistent with the idea of rapid evolution during this final phase of stellar formation. Astronomy Exam 4 Flashcards - Questions and Answers | Quizlet Thermonuclear reactions take place _________ of a star, Thermonuclear reactions take place in the core of a star because. what is the approximate radius of our galaxy? One of the small bodies that formed from the solar nebula and eventually grew into protoplanets. If a sunspot has a temperature of 3700 K and the photosphere of the Sun has a temperature of 5810 K, how many times brighter per unit area is the photosphere than the sunspot? What would be the next year you would expect to observe about the same number of sunspots? Main Sequence Stars. Identify whether each of the following statements about the Sun is true or false: The sun is more massive than the Earth. Neutron stars cram roughly 1.3 to 2.5 solar masses into a city-sized sphere perhaps 20 kilometers (12 miles) across. T or F sunspots are cooler than the photosphere, T or F sunspots are observed on the photosphere, T or F sunspots travel across the surface of the sun, while the sun itself remains rigid and stationary. A) A young G, K, or M star that is ejecting gas B) A giant or supergiant star that varies regularly in brightness C) A giant or supergiant star that varies randomly in brightness D) A massing O or B star that ionizes hydrogen in interstellar space Ans: A Section: 12-5 T Tauri stars take after their prototype T Tauri. Oh no! Identify whether each of the following statements about the Sun is true or false: Energy released by the sun is the result of fission reactions. Choose the four fundamental forces and rank them from strongest to weakest: equilibrium force, strong nuclear force, normal force, gravitational force, electromagnetic force, weak nuclear force, 1. strong nuclear force 2. electromagnetic force 3. weak nuclear force 4. gravitational force, the process in which 2 smaller elements merge together to form 1 larger element.......(ALCHEMY! One example is the Trapezium cluster of stars in the Orion Nebula. 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