If a giant molecular cloud is a distance of 27 pc away from Earth and drifts at a speed of 27 km/s toward Earth, how long (in years) would it take to reach Earth if the Sun remained at its current position?
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- A) A typical dust grain has a radius of about 0.1 micrometers and a mass of 10-14 grams. Roughly how many dust particles are in a cloud containing 1000 Msun of dusty gas if 1% of the cloud's mass is in the form of dust grains? B) What surface area would be covered by these grains if you put them side by side? Assume these grains are spherical. Answer in square light-years. C) Estimate the total surface area covered by the cloud assuming it's matter density is like that of a typical molecular cloud, about 10-21 g/cm3 (Hint: first calculate the clouds volume from it's mass and density, then determine its radius using the formula for volume of a sphere) Answer in square light-years. D) Comparing all above answers, What are the chances (very roughly) that a photon passing through the cloud will hit a dust grain?why do dark streaks appear in visible light images of the Trifid nebula, but appear bright in an infared imageWhy are emission nebulae red ?
- If a giant molecular cloud has a diameter of 56 pc and drifts relative to nearby objects at 19 km/s, how long (in yr) does it take to travel a distance equal to its own diameter?Why is it that stars of greater mass (and thus possess more fuel for nuclear fusion) spend less time on the main sequence of the H-R diagram than their lower mass counterparts?