Most large spirals and ellipticals are comparable to the Milky Way in mass

Indicate whether the statement is true or false


TRUE

Physics & Space Science

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A star remains on the main sequence for a time span equal to _____ of its total existence as an energy-generating star

A) 90 percent B) 40 percent C) 15 percent D) 55 percent

Physics & Space Science

The third-quarter Moon rises at noon

a. True b. False Indicate whether the statement is true or false

Physics & Space Science

Electrons are emitted from a surface when light of wavelength 500 nm is shone on the surface but electrons are not emitted for longer wavelengths of light. The work function of the surface is

A) 5.0 eV. B) 0.60 eV. C) 2.5 eV. D) 4.0 eV. E) 0.40 eV.

Physics & Space Science

Protostars are observable by radio telescopes but hard to detect in visible light because they have ________ and are ________.

A. low surface temperature; very distant B. small size; very distant C. low surface temperature; surrounded by dust D. small size; very hot

Physics & Space Science