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An astronomer need not have any particular need to observe any part of the sun's atmosphere.

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In which part of a shadow would you need to be to observe a lunar eclipse?

To observe a lunar eclipse, you need to be in the area where the shadow of the Earth falls on the Moon. This occurs when the Earth passes between the Sun and the Moon, casting its shadow on the lunar surface.


Why do some telescopes that collect electromagnetic radiation in the shorter wavelengths need to be placed either in dry areas or outside the atmosphere?

Telescopes that collect electromagnetic radiation in shorter wavelengths, such as ultraviolet or X-rays, need to be placed in dry areas or outside the atmosphere because water vapor and other gases in the atmosphere can absorb or scatter such high-energy radiation, affecting the observations. Placing these telescopes in dry areas or above the atmosphere helps ensure that they can collect unimpeded data in these wavelengths.


What two things must an astronomer find out in order to calculate a starts absolute brightness?

Three things, really. An astronomer needs to determine the apparent brightness of a star or other object, and needs to know its distance. He would also need to have an estimate about extinction - that is, how much of the light is absorbed on its way.


How much more massive or larger would Mercury planet need to be in order to maintain and hold an atmosphere?

Mercury would need to be at least 1.2 times more massive to hold onto an atmosphere. The lack of a substantial atmosphere on Mercury is due to its low gravity, making it unable to retain gases for an extended period. Increasing its mass would help it to have enough gravitational pull to hold onto an atmosphere.


Do plants need Atmosphere to grow?

Plants need a specific concentration of gases in the atmosphere, particularly carbon dioxide, in order to carry out photosynthesis and grow. Without the right atmospheric conditions, such as a lack of carbon dioxide, plants may struggle to survive and grow.