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Match the nebulae with their colors.

___________________________ is the change in the observed wavelength of radiation caused by the motion of the emitting body or the observer.

Consider the image.  The stars in the Antlia dwarf galaxy are all the same distance from Earth.If one star has an intrinsic luminosity of 4.4 Lsun and a second star has an intrinsic luminosity of 2.0 Lsun, which star appears brighter in the night sky?

The graph plots two properties of stars, temperature and luminosity. The data from 12 stars are plotted on the graph. Which point is the coolest star?

Which of these items is roughly the same size as a neutron star?

If you give a cart with a mass of 3.0 kg a push with a force of 69 Newtons, what is the cart’s acceleration?

If a star is circumpolar from a given location that means that the star is above the horizon all night but not during the day.

Because the celestial sphere is not real, it is not a good scientific model.

The ___________ of a gas is a measure of the average speed of the particles in the gas.

What phases would Venus show if the geocentric model were correct?