Physics

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An expanding shell of gas ejected from a medium-mass star during the latter stages of its evolution ... Started by BrownTown3	1 Replies 52 Views	Jul 27, 2018 by juliaf
Theoretical calculations indicate that a star more massive than some threshold around 15 or 20 solar ... Started by Pineapplelove6	1 Replies 54 Views	Jul 27, 2018 by joshbk44
In the context of nuclear fusion in massive stars, hydrogen fusion can last 7 million years in a ... Started by future617RT	3 Replies 269 Views	Jul 27, 2018 by lucas dlamini
Astronomers think of pulsars not as pulsing objects but rather as objects emitting beams. ... Started by anshika	1 Replies 90 Views	Jul 27, 2018 by kingfahad97
Stars more massive than the Chandrasekhar limit can eventually end up as white dwarfs if they reduce ... Started by ec501234	1 Replies 71 Views	Jul 27, 2018 by Anton
A star can remain in the giant-star stage for about 90 percent of its total lifetime before it dies. ... Started by bcretired	1 Replies 97 Views	Jul 27, 2018 by hanadaa
In 1916, Einstein published his__________that described gravity as a curvature of space-time. A) ... Started by K@	3 Replies 87 Views	Jul 27, 2018 by momtoalll
Which of the following statements is true of open clusters? A) They contain 105 to 106 stars in a ... Started by KimWrice	1 Replies 67 Views	Jul 27, 2018 by mohan
Observations and stellar evolution models indicate that the central star of a planetary nebula ... Started by go.lag	1 Replies 62 Views	Jul 27, 2018 by smrerig
Stars less massive than about 0.4 solar mass are referred to as _____. A) brown dwarfs B) red ... Started by swpotter12	1 Replies 63 Views	Jul 27, 2018 by Smiles0805
A white dwarf is: A) supported by energy flowing outward from its core. B) formed when low-mass ... Started by geoffrey	3 Replies 51 Views	Jul 27, 2018 by Heffejeff
Which of the following happens when a star runs out of hydrogen at its center? A) The core of the ... Started by maegan_martin	1 Replies 85 Views	Jul 27, 2018 by sarah_brady415
The size of a black hole, its Schwarzschild radius, is simply proportional to its _____. A) mass ... Started by ts19998	1 Replies 105 Views	Jul 27, 2018 by leannegxo
The key point to remember when considering the Hertzsprung-Russell (H-R) diagram of a star cluster ... Started by madam-professor	1 Replies 76 Views	Jul 27, 2018 by jazzlynnnnn
__________is a 650-million-year-old star cluster. A) Ceres B) The Polaris Cluster C) The ... Started by sdfghj	3 Replies 104 Views	Jul 27, 2018 by duke02
The short pulses and the discovery of the pulsar in the Crab Nebula are strong evidence that pulsars ... Started by notis	1 Replies 73 Views	Jul 27, 2018 by tanna.moeller
Jack, a quarterback, imparts a spin with his fingers when he throws the football during a match. The ... Started by APUS57	1 Replies 72 Views	Jul 27, 2018 by bpool94
One of the factors that escape velocity depends on is the: A) mass of the celestial body. B) ... Started by jazziefee	1 Replies 66 Views	Jul 27, 2018 by Carliemb17
Which of the following statements is true of the Chandrasekhar limit? A) A star more massive than ... Started by cnetterville	3 Replies 83 Views	Jul 27, 2018 by briezy
Which of the following statements is true of stars? A) They die when they exhaust their fuel, ... Started by jasdeep_brar	1 Replies 55 Views	Jul 27, 2018 by Madisongo23
In the context of the evidence on evolution of stars, you can estimate the _____ of a star cluster ... Started by pane00	1 Replies 67 Views	Jul 27, 2018 by elizabethrperez
In the context of nuclear fusion in massive stars, which of the following statements is true of ... Started by amal	1 Replies 118 Views	Jul 27, 2018 by aidanmbrowne
In the context of general relativity, time slows down in curved space-time. This is referred to as ... Started by nummyann	3 Replies 103 Views	Jul 27, 2018 by Sarahjh
In the context of helium fusion, if the core of a post-main-sequence star has no nuclear reactions, ... Started by Destiiny22	1 Replies 103 Views	Jul 27, 2018 by ktidd
In the context of giant stars, helium fusion produces _____ that accumulate in an inert core. A) ... Started by DyllonKazuo	1 Replies 116 Views	Jul 27, 2018 by cegalasso