Question 1

Why does stellar main- sequence lifetime decrease with increasing stellar mass?

Accepted Answer

A) It doesn't; higher mass stars have more hydrogen available for fusion, and thus have longer lifetimes. 
B) Higher outward pressure prevents the core hydrogen from being replenished by the star's outer layers. 
C) Higher core temperatures cause fusion to proceed much more rapidly. 
D) Strong stellar winds cause higher mass stars to lose mass quickly. 
A) It doesn't; higher mass stars have more hydrogen available for fusion, and thus have longer lifetimes. 
B) Higher outward pressure prevents the core hydrogen from being replenished by the star's outer layers. 
C) Higher core temperatures cause fusion to proceed much more rapidly. 
D) Strong stellar winds cause higher mass stars to lose mass quickly.

Question 2

What is the approximate range of masses that newborn main sequence stars can have?

Accepted Answer

A) 0)1 to 10 solar masses 
B) 0)001 to 150 solar masses 
C) 0)1 to 1,000 solar masses 
D) 0)1 to 150 solar masses 
E) 0)001 to 10 solar masses 
A) 0)1 to 10 solar masses 
B) 0)001 to 150 solar masses 
C) 0)1 to 1,000 solar masses 
D) 0)1 to 150 solar masses 
E) 0)001 to 10 solar masses

Why does stellar main- sequence lifetime decrease with increasing stellar mass?

What is the approximate range of masses that newborn main sequence stars can have?

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Exam 13: Star Stuff

Why does stellar main- sequence lifetime decrease with increasing stellar mass?

What is the approximate range of masses that newborn main sequence stars can have?

A Modern View of the Universe

Discovering the Universe for Yourself

The Science of Astronomy

Making Sense of the Universe: Understanding Motion, Energy, and Gravity

Light: the Cosmic Messenger

Formation of the Solar System

Earth and the Terrestrial Worlds

Jovian Planet System

Asteroids, Comets, and Dwarf Planets: Their Nature, Orbits, and Impacts

Other Planetary Systems: the New Science of Distant Worlds

Our Star

Surveying the Stars

The Bizarre Stellar Graveyard

Our Galaxy

A Universe of Galaxies

The Birth of the Universe

Dark Matter, Dark Energy, and the Fate of the Universe

Life in the Universe

Filters