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| Term Interstellar gas is composed mainly of | Definition 90% hydrogen 9% helium by weight |
|---|---|
| Term Which statement about dark dust clouds is true? | Definition They can be penetrated only with longer wavelengths like radio and infared |
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Contents
- 1 What effect does the dust in interstellar clouds have on Starlight?
- 2 When visible light from a star passes through interstellar dust the light?
- 3 What effect does the dust in interstellar clouds have on Starlight quizlet?
- 4 Why is interstellar dust so much more effective than interstellar gas at absorbing starlight?
- 5 How does the interstellar medium obscure our view of most of the Galaxy?
- 6 What are the two factors that affect the brightness of a star as seen from the Earth?
- 7 What three factors affect a star’s brightness apparent magnitude )?
- 8 What is interstellar dust mostly made of?
- 9 What happens when an interstellar cloud fragment shrinks?
- 10 Why can radio waves get through the dust clouds but light is blocked?
- 11 Can a star become a red giant more than once?
- 12 How does interstellar dust affect the appearance of background stars?
- 13 Why does interstellar dust block starlight?
- 14 Does dust block blue light?
- 15 How does the temperature of an interstellar cloud affect its ability to form stars?
- 16 What effects does the interstellar medium ISM have on Starlight?
- 17 How dense are interstellar clouds?
- 18 What are the two main ingredients of interstellar clouds *?
- 19 How can interstellar dust block starlight in spite of its extremely low density?
- 20 Is the density of interstellar dust is very high?
- 21 Why are emission nebula red?
- 22 What advantage do astronomers gain by studying interstellar gas and dust what wavelengths of light are used to study these regions and why?
- 23 What does the interstellar medium consist of?
- 24 What do sunspots solar prominences and solar flares all have in common?
- 25 What makes up interstellar medium quizlet?
- 26 What affects the brightness of stars?
- 27 Which factors affect how bright a star appears in the sky?
What effect does the dust in interstellar clouds have on Starlight?
We have seen that absorption of starlight by interstellar dust can cause stars to appear fainter than they should and therefore cause us to overestimate their distance or underestimate their luminosity. In addition interstellar reddening can cause stars to appear redder than they should.
When visible light from a star passes through interstellar dust the light?
Figure 6. Scattering of Light by Dust: Interstellar dust scatters blue light more efficiently than red light thereby making distant stars appear redder and giving clouds of dust near stars a bluish hue. Here a red ray of light from a star comes straight through to the observer whereas a blue ray is shown scattering.
What effect does the dust in interstellar clouds have on Starlight quizlet?
starlight scattered by dust particles. What effect do even thin clouds of dust have on light passing through them? It dims and reddens the light of all more distant stars.
Why is interstellar dust so much more effective than interstellar gas at absorbing starlight?
interstellar dust particles are larger in size consequently blocking visible light. Why is interstellar dust so much more effective in absorbing starlight then interstellar gas? It tells us that interstellar dust particles must be elongated in shape but also that they tend to be aligned over large regions of space.
How does the interstellar medium obscure our view of most of the Galaxy?
How does the interstellar medium obscure our view of most of the galaxy? It produces so much visible light that it is opaque and blocks our view of anything beyond it. It reflects most light from far distances of the galaxy away from our line of sight.
What are the two factors that affect the brightness of a star as seen from the Earth?
The apparent brightness of a star depends on both its luminosity and its distance from Earth. Thus the determination of apparent brightness and measurement of the distance to a star provide enough information to calculate its luminosity.
What three factors affect a star’s brightness apparent magnitude )?
Three factors control the brightness of a star as seen from Earth: how big it is how hot it is and how far away it is. Magnitude is the measure of a star’s brightness. Apparent magnitude is how bright a star appears when viewed from Earth.
What is interstellar dust mostly made of?
Interstellar dust is made of compounds of various elements such as oxygen carbon iron silicon and magnesium. It originates from the death of stars where stars during their lifetime create metals and explode at their end or blow off their outer layers.
What happens when an interstellar cloud fragment shrinks?
What happens when an interstellar cloud fragment shrinks? It first becomes opaque Density rises Temperature rises Pressure rises. … its luminosity decreases while its temperature increases.
Why can radio waves get through the dust clouds but light is blocked?
Contrast the chemical composition of interstellar gas with that of interstellar dust. … Why can radio waves get through the dust clouds but light is blocked? The interstellar dust grains are about the size of the waves of light they absorb but are. much smaller than the long radio waves that move around them freely.
Can a star become a red giant more than once?
13) A star may undergo two or more red giant expansion stages. 14) The helium flash shows up on the H-R diagram on the way to the horizontal branch.
How does interstellar dust affect the appearance of background stars?
Solution: Interstellar dust dims the brightness and alters the color of the stars thereby reddening the light. … Therefore it comes straight to our sight without going through scattering and the star then appears to be red a phenomenon called reddening.
Why does interstellar dust block starlight?
Dust particles interact with light both through scattering and absorption. In both cases there is a reduction in the amount of starlight you receive described by Eqs. This is partly due to scattering partly due to absorption on little dust grains. …
Does dust block blue light?
The dust grains are small and such small particles turn out to scatter light with blue wavelengths more efficiently than light at red wavelengths.
How does the temperature of an interstellar cloud affect its ability to form stars?
How does the temperature of an interstellar cloud affect its ability to form stars? Higher temperatures inhibit star formation. Hydrogen in molecular form H2 is thought to be very abundant in gas clouds in space but these molecules emit radiation relatively inefficiently since they are symmetrical molecules.
What effects does the interstellar medium ISM have on Starlight?
The components of the interstellar medium — atoms molecules and dust grains — directly affect the light emitted by stars. When light from a distant star passes through the material between stars the interaction changes the light’s properties such as its intensity at different colors.
How dense are interstellar clouds?
The interstellar gas consists partly of neutral atoms and molecules as well as charged particles such as ions and electrons. This gas is extremely dilute with an average density of about 1 atom per cubic centimeter.
What are the two main ingredients of interstellar clouds *?
The region between the stars contains interstellar clouds composed primarily of dust and gas.
How can interstellar dust block starlight in spite of its extremely low density?
How can interstellar dust block starlight in spite of its extremely low density? starlight scattered by dust particles. It dims and reddens the light of all more distant stars. What effect does even thin clouds of dust have on light passing through them?
Is the density of interstellar dust is very high?
The density of interstellar dust is very low yet it still blocks starlight because… the dust particles are about the same size as the light waves they absorb.
Why are emission nebula red?
Due to the prevalence of hydrogen in interstellar gas and its relatively low energy of ionization many emission nebulae appear red due to the strong emissions of the Balmer series. … Emission nebulae often have dark areas in them which result from clouds of dust which block the light.
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What advantage do astronomers gain by studying interstellar gas and dust what wavelengths of light are used to study these regions and why?
Dust grains are important. They block visible light while emitting infrared light and thus help determine what astronomers can see while controlling much of the energy balance in the interstellar medium (ISM) by virtue of the absorption and subsequent re-emission at longer wavelengths of light from stars.
What does the interstellar medium consist of?
In a nutshell the interstellar medium is the material that fills the space between stars. 99% of the interstellar medium is made up of (mostly hydrogen) gas and the rest is composed of dust. The interstellar medium is vast and expansive in size but very very low in density.
What do sunspots solar prominences and solar flares all have in common?
What do sunspots solar prominences and solar flares all have in common? They are all strongly influenced by magnetic fields on the Sun. … Like all objects the Sun emits thermal radiation with a spectrum that depends on its temperature and the Sun’s surface temperature is just right for emitting mostly visible light.
What makes up interstellar medium quizlet?
the matter between stars composed of two components gas and dust intermixed throughout all of space. an interstellar dust particle roughly 10^-7 m in size comparable to the wavelength of visible light. You just studied 11 terms!
What affects the brightness of stars?
As the size of a star increases luminosity increases. If you think about it a larger star has more surface area. That increased surface area allows more light and energy to be given off. Temperature also affects a star’s luminosity.
Which factors affect how bright a star appears in the sky?
Two factors determine the brightness of a star:
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