____ are star-like objects that contain less than 0.08 solar masses an will never raise their core temperatures high enough that the proton-proton chain can begin. Other minor fusion reactions do occur in these objects. They fall in a gap between the low-mass M dwarf stars and the massive planets in which nuclear fusion never occurs
a. Brown dwarfs
b. Herbig-Haro objects
c. Bok globules
d. T-Tauri star
e. Main sequence stars
A
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In the context of light curves, observations of an eclipsing binary system can directly tell astronomers not only the masses of its stars but also their _____
A) orbital periods B) diameters C) intensity of magnetic fields D) temperatures
A rod with a diameter of 2.00 mm projects 20.0 mm horizontally outward from a wall. A 2.00 N coat is hung from the end of the rod and the rod deflects downward by 
The shear stress of the rod is
a. 
b. 
c. 
d. 
e. 
Why do galaxy collisions lead to star formation?
A. Interstellar clouds collide and become highly compressed. B. Interstellar clouds are ignited by passing stars from the other galaxy. C. Stars collide with each other, explode, and their gas creates new stars. D. All of these choices are correct.
A car rounds a curve while maintaining constant speed. Which of the statements is correct?
A. The velocity of the car is constant B. The acceleration of the car is zero C. A net force acts upon the car D. No net force acts on the car E. The velocity of the car is zero