Why do blue stragglers stand out in globular clusters?
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They are much bluer and apparently younger than the evolved red giants that are the brightest stars in these old clusters. Apparently they are the result of mergers between stars in the dense globular clusters.
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The size of the gravitational force that Earth exerts on the Moon is ____ that the Moon exerts on Earth.
A. greater than B. the same as C. smaller than
From the South Pole, Polaris would appear directly overhead
Indicate whether the statement is true or false
Two extremely flat glass plates, 10.0 cm wide, touch at one end but are separated by a thin wire at the other end, forming a wedge
Light with a wavelength of 450 nm shines almost perpendicularly on the glass and forms fringes which are 1.80 mm apart. What is the diameter of the wire? A) 25.0 µm B) 10.0 µm C) 20.0 µm D) 12.5 µm E) 17.5 µm
The mass of an atom of carbon-12 (Z = 6) is less than the mass of 6 protons and 6 neutrons because of __________
Fill in the blank(s) with correct word