Occurs when the frequency of a photon of light is

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____________ occurs when the frequency of a photon of light is shifted towards the red end of the electromagnetic spectrum. : Redshift. A shift towards the red end of the spectrum indicates lower energy, which means longer wavelength. As you have learned earlier, one instance in which redshift is observed is when a light-emitting object (such as a distant galaxy) is moving further away. As it moves away, the wavelength of the light is stretched out, causing the light to shift towards red. On the other hand, if the source of the light were moving closer, blueshift would result as the wavelength of the light gets compressed (higher energy, higher frequency, lower wavelength)
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_______________ redshift is caused by the expansion of the universe. : Cosmological. As the light is moving from its point of emission (i.e. a distant galaxy) to the point of detection (i.e. Earth), the fact that the universe is expanding and the space between the point of emission and detection is increasing results in an increase in the wavelength of the light (lower energy, a shift towards red). Just picture the light, which is taking millions of years to arrive at your telescope, is being stretched as the universe it is passing through is stretching. This will obviously result in a longer wavelength. A ________________ black hole has a mass of up to tens of billions of solar masses. Explanation: Supermassive. It is believed that all galaxies contain supermassive black holes at their galactic centers. Two supermassive black holes can co-exist in the same galaxy for a certain amount of time. The ___________ mass is a standard way to express mass in astronomy and is used to describe the masses of other stars and galaxies. : Solar. Solar mass is equal to the mass of the sun, about 332,950 times the mass of the Earth. The accepted symbol and value for solar mass is: A __________ ________ is the distance light travels in a vacuum in one year. : Light year (LY): A light year is equal to exactly 9,460,730,472,580.8 km (9 trillion kilometers), about 5,878,625,373,183.61 statute miles (6 trillion miles), or about 0.3066 parsecs. Venus, Earth, and Mars possess conditions under which there can be remote speculation of living organisms and of these three, only __________ offers conditions compatible with the existence of higher forms of plant or animal life as we know them. : Earth. The possibility of life processes unknown to us cannot be ruled out. With the possible exception of vegetation on Mars, we have no knowledge of any life on other planets of the solar system. Life may abound in the universe or it may be unique to the __________. : Earth. It is not known exactly how life began on our own planet. Therefore, we have no objective means of assessing the probability of life beginning elsewhere or the likelihood of the critical steps of evolution which may lead to intelligent beings.
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occurs when the frequency of a photon of light is shifted...

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