What do you mean by white dwarfs?
Q: What is an emission nebula?
A: The space between stars and galaxies is filled with clouds of gas and dust. These clouds of gas and…
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Q: require(s) that a young hot star (T ≥ 25,000 K) be relatively nearby.
A: Correct answer is Emission nebula
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Q: What are the approximate spectral type, temperature, absolute magnitude number, and luminosity of…
A: Required : Spectral type, absolute magnitude, temperature and luminosity of star E.
Q: What four (4) stars are not as bright (luminous) as our Sun? JUST NAME 4 STARS THAT ARE NOT AS…
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Q: Each choice below lists a spectral type and luminosity class for a star. Which one is a hot main…
A: Luminosity of main sequence star is class V and spectral type of hot main sequence star is O.
Q: The Hertzsprung-Russel Diagram (Figure 4) shows patterns of __, __, and __ of __ a. distance,…
A: Hertzsprung Russel diagram shows the different stages in the life of a star. It basically shows the…
Q: The telescope and CCD camera described in question 2 are scheduled to observe the star cluster M67…
A: The cluster M67 is never visible in the sky from London so we should abandon any plans to observe…
Q: Which of the following is least reasonable regarding a star's position on the HR diagram? Group of…
A: "White dwarfs are small and cool and are located in the lower left part of the HR diagram."This…
Q: Which of the following is least reasonable regarding the mass of stars? Group of answer choices…
A: Stars are of different sizes and they have their own set of characteristics based on multiple…
Q: 1. The relative velocities of four stars are shown in the figure below with arrows. If an astronomer…
A: Redshift of a light spectra is the phenomenon when we observe an increase in the wavelength and…
Q: Choose the correct statements concerning spectral classes of stars. (Give ALL correct answers, i.e.,…
A: Hello. Since your question has multiple sub-parts, we will solve first three sub-parts for you. If…
Q: For each of the following parts, find the most possible type of object by considering the…
A: Since you have posted a question with multiple sub-parts, we will solve first three subparts for…
Q: True or False 8. Almost all stars are in binary systems. The book says: "So far you have been…
A: The statement: All stars are in binary systems. The book says: "So far you have been considering the…
Q: Fill in blank missing word A Blank variable is type of bright giant that is in the instability strip…
A: This problem can be solved by knowing some properties of Cepheid variable stars.
Q: A star with an original mass of 9MSun undergoes an active period where it experiences mass loss via…
A: Given data: Mass of the star, Mstar=9Msun Time, t=1.1 million years = 1.1×106 years New mass,…
Q: Two stars have the same apparent magnitude, my = 14, but Star A has a parallax of 0.060 arc seconds…
A: Required to compare two stars A and B
Q: Do we need to worry that the Sun will swell to a red giant and destroy the Earth any time soon?…
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Q: Why don't red dwarfs become giant stars?
A: Red dwarf stars or M-type stars are small stars with a mass of 0.08 to 0.6 times the mass of the…
Q: Absolute magnitude 7 -6 5 4 3 2 7 0 Based on the figure, M = 0.3 & Cephel- kpc Type (classical)…
A: Given, The pulsation period, P=16hrP=1624daysP=0.67days Angular distance,θ=20arc minθ=20×60206265arc…
Q: On a Hertzsprung-Russell diagram, where on the main sequence would we find stars that have the…
A: We need to investigate where we find the largest main sequence stars in the H-R diagram.
Q: The sketch below shows an H-R diagram for a star cluster. Consider the star to which the arrow…
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Q: How large is our supermassive black hole in terms of the size of the Earth’s orbit? (Divide the…
A: The Schwarzschild equation for the radius of the event horizon around a black hole is given by the…
Q: why are Cepheid variable stars good distance indicators? What about supernovae?
A: Named after delta-Cephei, Cepheid Variables are the most important type of variable because it has…
What do you mean by white dwarfs?
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- Indicate whether the following statements are true or false. (Select T-True, F-False. If the first is T and the rest F, enter TFFFFF). A) White dwarfs are small dense objects about the size of the Earth. B) White dwarfs are composed mostly of hydrogen. C) A planetary nebula forms when a star violently explodes. D) A planetary nebula is the remnant of the outer envelope of a star. E) A white dwarf is the remnant of the star's core visible after the outer layers have been ejected.In which component of the interstellar medium do new stars form? O molecular clouds O HII intercloud medium OHI clouds OHI and molecular clouds O hot coronal gasWhat is fusion? How does it happen inside a star?
- What are the on the axes of a Hertzsprung-Russell diagram? (b) Name one thing you can tell about a star from its location in an H-R diagram (Other than luminosity & temperature!) c) Where are most stars located in the diagram?Place the following events in the formation of stars in the proper chronological sequence, with the oldest first and the youngest last. w. the gas and dust in the nebula flatten to a disk shape due to gravity and a steadily increasing rate of angular rotation x. a star emerges when the mass is great enough and the temperature is high enough to trigger thermonuclear fusion in the core y. the rotation of the nebular cloud increases as gas and dust concentrates by gravity within the growing protostar in the center z. some force, perhaps from a nearby supernova, imparts a rotation to a nebular cloud y, then z, then w, then x z, then y, then w, then x w, then y, then z, then x z, then x, then w, then y x, then z, then y, then w MacBook Air on .H. O O O OWhat are the two possibilities for the final state of a close, massive binary system?
- What is the relationship between the color of a reflection nebula and the color of the star that illuminates it?How many times hotter than our sun is the hottest type O star, which has a surface temperature 40,000 K? Number times hotter =List the following 5 terms in order through a stars life cycle (starting with the sun), through the remainder of its lifetime: a. Black dwarf b. Planetary nebula c. Red giant d. Star (Sun) e. White dwarf