What factors resist the contraction of a cloud of interstellar matter?
Q: What would most bright nebulae look like if there were no interstellar dust?
A: A nebula is defined as a large region of interstellar clouds made of dust, hydrogen, helium, and…
Q: The dust in a molecular cloud has a temperature of about 34 K. At what wavelength (in nm) does it…
A: temperature = T = 34 K wavelength = λmax=?
Q: A giant molecular cloud is 30 pc in diameter and has a density of 339 hydrogen molecules/cm^3. What…
A: Concept used: Mass is found by multiplying by density and volume of sphere.
Q: A molecular cloud is 22 pc in diameter and is located 303 pc from Earth. What is its angular size on…
A:
Q: You observe a spectral line from an emission nebula at a wavelength of 723 x 10-9 m. If you are…
A:
Q: A typical dense core of an interstellar gas cloud has a diameter of 0.2 pc and a mass of 2 solar…
A: The diameter of the gas cloud is defined as 0.2 pc. Therefore, the radius of the gas cloud will be…
Q: If a protostellar disk is 210 AU in radius and the disk plus the forming star together contain 4…
A: the orbital speed is, v=GMr one solar mass is 1.989×1030 kg and 1 AU is 1.496×1011 m. thus,…
Q: Now, rank the same objects by increasing temperature. For spherical objects, use the surface…
A: Intercloud gas: The gases other than intersteller gases present in space are known as intercloud…
Q: If the RR Lyrae stars in a globular cluster have average apparent magnitudes of +19, how far away…
A: From the figure, absolute magnitude of RR Lyrae star is 0.75. Using the Magnitude-Distance formula,…
Q: The very first "image" of a black hole, at the centre of galaxy M87, was recently taken by the Event…
A: Given: The wavelength of the hydrogen line is λ = 21 cm The diameter of the earth is D = 12742 km…
Q: Why massive stars are short lived?
A: A massive star has a shorter life spanthan an average star because of fasterhydrogen fuel…
Q: Globular clusters contain no stars more massive than the Sun. Which of the following seems like the…
A: First, we are aware that no stars more massive than the Sun can be found in globular clusters. Any…
Q: A giant molecular cloud is 30 pc in diameter and has a density of 330 hydrogen molecules/cm^3. What…
A:
Q: 8. If a galaxy has an apparent radial velocity of 2000 km/s and the Hubble constant is 72 km/s/Mpc,…
A: Using Hubble's law we can solve this
Q: A) A typical dust grain has a radius of about 0.1 micrometers and a mass of 10-14 grams. Roughly…
A:
Q: you assume that a globular cluster 4 arc minutes in diameter is actually 27 pc in diameter, how far…
A:
Q: planetary nebula expands at 38 km/s. How far will it expand (in km) in 3 million years?
A: Here given nebula is expanding with given speed. As in 1 sec nebula expands 38 Km, In 3 million…
Q: Hotter, more massive stars are virtually absent from globular clusters. What does this tell us?…
A: Globular clusters are clusters of stars, that are nearly symmetrical and round shaped clusters.…
Q: QUESTION 16 Use the figure shown below to complete the following statement: A low-mass protostar…
A: During the formation of a low-mass protostar, a protostar accumulates mass by accreting material…
Q: Why are interstellar lines so narrow?
A: Spectral lines are formed due to electrons making transitions between the energy levels inside the…
Q: Given a low density cloud of Hydrogen atoms, what happens when the temperature of the cloud is…
A:
Q: Why do old stars have less metal compared to new ones?
A: As per the Big Bang theory, the universe expanded from an initial high-density state. In the…
Q: What temperature would interstellar dust have to have to radiate most strongly at 100 micro meter?
A: When stars die they will slowly send out their outer layers. This forms large clouds of dust and is…
Q: Which of the following statements is/are true regarding a nebula? Which of the following statements…
A: According to the latest research, The solar system came into existence from a single nebula (known…
Q: The RR Lyrae stars in a globular cluster have apparent magnitudes of 14. Assuming an absolute visual…
A: Given that the apparent magnitude mv=14 and the absolute visual magnitude Mv=0.5, substituting…
Q: 1) a) Calculate the Jeans length for the dense core of a giant molecular cloud with T=10 K, n =…
A: To answer: a) Calculate the Jeans length for the dense core of a giant molecular cloud with T=10 K,…
Q: (a) Rank the following components of the interstellar medium in order of the wavelengths at which…
A: (a). Components of the interstellar medium are detected due to the interaction between photons of…
Q: How do the spectra of H II regions differ from the spectra of reflection nebulae? Why?
A:
Q: An interstellar cloud is observed at a wavelength of 2.898 µm. Estimate the temperature of the…
A: The energy released by the core of a star is absorbed by its outer layers which then remits them.…
Q: How is the blue color of a reflection nebula related to the blue color of the daytime sky?
A: Nebula is a giant cloud of dust and gas. Some are formed after the explosion of a star when it's…
Step by step
Solved in 2 steps
- Suppose you want to observe the molecular gas in a galaxy with redshift z using the rotational transition of CO J=4-3. What frequency would you observe this transition at? (Hint: the CO J=1-0 emits a photon at 115.27 GHz, and higher order transitions emit photons with frequencies in multiples of J. Express your answer as an integer. Values: z = 3.7Can you please help with Part 2 of 2? Thank you.What evidence can you cite that our galaxy has a galactic corona?
- why do dark streaks appear in visible light images of the Trifid nebula, but appear bright in an infared imageWhy are emission nebulae red ?Figure 2 shows the "rotation curve" of NGC 2742. It plots the “radial velocity (V)" (how fast material is moving either toward or away from us) that is measured for objects at different distances (R = radius") from the center of the galaxy. The center of the galaxy is at 0 kpc (kiloparsecs) with a speed of 9 km/sec away from us. (These velocities have been corrected for the observed tilt of the galaxy and represent true orbital velocities of the stars and gas.) 200 100 U4779 -100 As you can see, one side of the galaxy is moving with a negative velocity (spinning toward us), while the other side has a positive velocity (spinning away from us). Using Newton's gravity equation, we will be able to determine the gravitational mass of the entire galaxy and how the mass varies versus distance from the galaxy's center. -200 -8 8 -4 Radius (kpc) Read the following text carefully and follow the instructions: Select five radii spaced evenly from 0-10 kpc across the galaxy. Your selections should…