- #1
tosv
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What kind of observation can be made to verify the existence of cosmic dust (space dust)?
Detecting Cosmic Dust: The Challenges and Solutions
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In summary, cosmic dust (space dust) can be observed by measuring the differences in light from a known source as it passes through the dust, which can then determine its molecular make-up and density. This can also be seen by looking at the milky way at night, where dust creates dark lanes by blocking light from reaching us. Additionally, the spectrum of a star can also show the presence of dust through absorption and emission lines. However, unlike interstellar gas, cosmic dust causes scattering and extinction of light, making it difficult for astrophysicists to study. To observe dust within our solar system, one must go to a very dark place and wait for their eyes to adapt, allowing them to see zodiacal light and geg
- #2
twistedspark
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As I understand it: as the light from a known source (measured and steady luminocity and known wavelength) behind the dust passes through the dust, this light gets scattered. The light that then reaches the observer is different (color and length). Record these differences and you can determine the dust's molecular make-up and density.
- #3
Drakkith
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Simply looking up at the milky way at night in a dark area will show you dust, as it blocks light from the rest of the galaxy from reaching us, creating dark dust lanes.
- #4
KrisOhn
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If you take the spectrum of a star and that light passes through dust between the star and us, it will show up in the spectrum as absorption and emission lines.
- #5
Chronos
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Unlike interstellar gas, cosmic dust does not have absorption or emission lines. It causes scattering and extinction of light emitted by more distant sources making it a real PITA to astrophysicists.
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- #6
JeffKoch
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Go to a very, very dark place (hard to find, you have to make a special effort and go far from highways, cities, and towns on a clear moonless night), wait for your eyes to fully dark-adapt (might take half an hour or more), and look up - you can see dust within our solar system as zodiacal light and gegenschein.
- #7
KrisOhn
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Chronos said:
Ahh, I figured so.
FAQ: Detecting Cosmic Dust: The Challenges and Solutions
What is cosmic dust?
Cosmic dust refers to tiny particles that are present in the space between stars and galaxies. These particles can be made up of various materials, such as carbon, silicon, and iron.
How is cosmic dust detected?
Cosmic dust can be detected using a variety of methods, such as telescopes, spacecraft, and laboratory experiments. Telescopes can capture images of cosmic dust in space, while spacecraft can collect samples of cosmic dust and bring them back to Earth for analysis. Laboratory experiments can also simulate the conditions in space to study the properties of cosmic dust.
3. What are the properties of cosmic dust?
Cosmic dust can vary in size, shape, and composition. It can range from tiny particles less than a micrometer in size to larger particles several millimeters in diameter. The composition of cosmic dust can also vary, with some particles containing organic molecules and others containing minerals like silicates and metal oxides.
4. How does cosmic dust impact the universe?
Cosmic dust plays a crucial role in the formation of stars and planets. As these particles collide and stick together, they can form larger bodies like asteroids and comets. Additionally, cosmic dust can also contribute to the formation of interstellar clouds, which are important for the creation of new stars.
5. Can cosmic dust be harmful to humans?
In small quantities, cosmic dust is not harmful to humans. However, large amounts of cosmic dust can pose a threat to spacecraft and satellites in orbit. The high speed of these particles can cause damage to equipment and even astronauts if they are not properly shielded.