A star of magnitude 1 appears ______________ times brighter than a star of magnitude 2
Fill in the blank(s) with correct word
2.51
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YSOs are in hydrostatic equilibrium
a. True b. False Indicate whether the statement is true or false
Hot gas created during the big bang should be detectable becausethe ____
a. gas has traveled with galaxies as they formed and is spread through the Universe of the present day b. big bang occurred everywhere at once, and should be visible in any direction at long look-back times c. big bang occurred in a certain location, and the radiation from the gas is concentrated there d. gas has travelled to the edges of the Universe and will be visible at negative redshifts e. radiation emitted by the gas has travelled at the same speed as the expanding Universe and is visible all around us
According to Hubble's Law, the greater a galaxy's redshift, the:
A) closer it is to us. B) younger it is. C) faster it's approaching us. D) farther it is from us. E) greater its mass.
A microscope has an objective lens of focal length 1.4 mm and an eyepiece of focal length 20 mm, adjusted for minimum eyestrain. A blood sample is placed 1.5 mm from the objective
How far apart are the lenses? A) 20 mm B) 21 mm C) 23 mm D) 33 mm E) 41 mm