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You are watching: Which event marks the birth of a star?

Answer - 10) all stars room born as a an outcome of balance of forces that is the pressure of gravity compresses atoms in interste…View the full answer

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Transcribed photo text: OBES mine Courses concern 10 Which event marks the bear of a star? Marof p Flagston O collapse of one interstellar cloud ob development of a photosphere o e blend of hydrogen atoms right into hellum atoms Od instability in one interstellar cloud o e development of the planetary nebula concern 11 no yet reply A usual protostar might be several thousand times an ext luminous 보다 the Sun. What is the source of this energy? significant out the F rebound question select one a. The ionization the the gas together it heats up ob Chemical combustion of hydrocarbons Nuclear blend in its main point d. Indigenous the relax of gravitational power as the protostar proceeds to shrink From nearby hot stars or supernovae that have actually Initiated the star formation process Question 12 Interstellar gas is created of marked out of 1.00 l Flag question choose one oa ammonia, methane and water vapor b. 90% hydrogen 9% hellum by weight c. Only hydrogen od 10% hydrogen 90% helium by number of atoms some hydrogen, yet mainly carbon dioxide EUR concern 13 not yet answer What are the characteristics of globular cubertitats? significant out that F Flag question select one: O a. No stars as hot as our sun ob No main sequence stars loll, through billions the member stars oc. Old age and also hundreds that thousands come milions that member stars Od. A few hundred stars, many still ~ above the key sequence oe hundreds of light year across, through bright OB stars leading Question 14 not yet answere Why are star clusters nearly ideal laboratories for stellar studies? significant out of ns Flag question select one: O a Stars in clusters are all relatively young and also therefore shine brightly b. Favor our Sun, stars in clusters are constantly located in the aircraft of the Milky method Galaxy O c. Their combined light provides them much simpler to spot indigenous a distance. O d. Every stars in the cluster are the very same size and also luminosity O Stars in clusters have the very same age, similar composition and are in ~ the very same distance away inquiry 15 not yet answered In the Milky method galaxy, gas and dust room found significant out the 1.00 p Flag question select one a in emission nebulae a. In emissions nebulae. B. In dark nebulae. Ocin neutral hydrogen clouds din molecule clouds. E everywhere. LLLLL https://elearning a sledu/mod/quiz/sttemptohp?atteript:1944908 11