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Chapter 18: Problem 5

Why do you think it is useful to put an astronomical telescope in a satellite?

Short Answer

Expert verified
A space telescope avoids atmospheric distortion, can observe a broad spectrum of light, provides continuous observation, and is free from light pollution.

Step by step solution

01

Understanding the Atmosphere's Impact

The Earth's atmosphere distorts and blocks some of the light that comes from space. This includes both visible light and other types of electromagnetic radiation. By placing a telescope in a satellite, we avoid atmospheric interference and can get clearer and more detailed images of space.
02

Access to a Broad Spectrum of Light

Earth's atmosphere absorbs a significant portion of the electromagnetic spectrum, including most ultraviolet and infrared light. A space telescope can capture images using these wavelengths, providing more information about astronomical objects that cannot be seen from the ground.
03

Continuous Observation

Ground-based telescopes have limited observing times due to the day-night cycle and weather conditions. A space telescope in orbit can observe objects in space continuously without these interruptions.
04

Avoiding Light Pollution

Ground-based telescopes also suffer from light pollution caused by artificial lights. In space, a telescope is free from this issue, allowing for much clearer images.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Atmospheric Interference
One big problem with Earth-based telescopes is the atmosphere. Our atmosphere bends, distorts, and absorbs some light from space. This interference makes it difficult to get clear images.
This is not just about visible light! The atmosphere also affects other types of electromagnetic radiation.
For example, Earth's atmosphere blocks most of the X-rays and gamma rays from space.
Putting telescopes in space helps avoid these issues. Without the atmosphere in the way, space telescopes can capture clear and detailed images of the universe.
Electromagnetic Spectrum
The electromagnetic spectrum includes all types of light, not just the kind we see with our eyes.
It ranges from radio waves to gamma rays.
Earth's atmosphere blocks many parts of this spectrum.
Ultraviolet (UV) and infrared light, for instance, are mostly absorbed by the atmosphere.
Space telescopes can capture light from these wavelengths. This provides scientists with more data about astronomical objects.
Different parts of the spectrum can show different information.
  • Infrared can show heat, useful for studying stars and planets.
  • UV light helps in studying the most energetic processes in the universe.
A broader view of the spectrum gives a fuller picture of the cosmos.
Continuous Observation
Observing the universe from Earth has its time limits.
The day-night cycle means telescopes on the ground can only observe during the night.
  • Weather conditions can also interrupt observations.
  • Clouds, rain, and even air temperature can affect the quality of the observations.
Space telescopes do not have these limitations.
They can observe the universe 24/7 without interruptions.
This continuous observation is critical for studies that need long and uninterrupted monitoring.
An example is observing the changes in brightness of distant stars, which can indicate planets orbiting them.
Light Pollution
Light pollution is a significant problem for Earth-based telescopes.
Artificial lights from cities and towns make it hard to see faint objects in the night sky.
Even distant lights can scatter and create a glow that affects astronomical observations.
This is especially problematic for telescopes that need to detect very faint objects.
In space, there is no artificial light.
Space telescopes are not affected by light pollution, allowing them to capture the faintest and most distant objects clearly.
This clarity is essential for studying galaxies, distant stars, and other faint cosmic phenomena.

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