One explanation for dark matter includes \"normal\" type matter that is not lumi

Question

One explanation for dark matter includes "normal" type matter that is not luminous enough for us to detect. What are these objects called? (pick one) NERDs, MACHOs, NACHOs, WIMPS.

Which of the following can be used as a "standard candle" because they have a consistent luminosity? a)pulsars b)black holes c)Type I supernovae

d)Type II supernovae

Which of the following show evidence for dark matter: a) gravitational lensing b) the way two galaxies collide c) speed of stars in a galaxy d)All of the above

According to the Hubble Law, a galaxy with a velocity of 25000 km/s is ____. (note that Hubble's constant is 70 km/s/Mpc). a)closer than 100 million pcs away

b) between 300 and 400 million pcs away c) over 700 million pcs away d) None of the above

Stars on the periphery of a galaxy have a rotational velocity around the galactic center that is _____ expected from what mass we can observe. a)lesser than

b) equal to c) greater than

Galaxies that have no disk and no recent, significant star formation are classified as: a) spiral b) irregular c)elliptical d)barred

Explanation / Answer

Type I supernova are is the best candidate for the Standardisible candles cause they do not have same peak brightness. Hence the option C is correct.
Gravitational lensing, Galaxies collide and the speed of the stars are the evidence of the dark matter, so hence the option D is correct.
According to the Hubble law, a galaxy with a velocity of 25000 km/s is between 300 and 400 million pcs away. Hence the option B is correct.
Galaxies that have no disk and no recent significant star formation are classified as the elliptical galaxy. Hence the option C is correct.

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