Snowder Astronomy 100 Homework

Astronomy 100 Quiz 1 NAME_____________________________Circle the ONE most comprehensive response. 1.If the Moon is rising at noon, the phase of the Moon must be... a. new.b. first quarter.*c. third quarter.d. full.2.Is it possible to prove, for certain, that a scientific theory is false? 3.Why do we see the same face of the Moon at all times? a. because the Moon does not rotate on its axisb. because the Moon’s rotation (spin on axis) and orbital periods are equal *c. because the Sun only illuminates one half at a timed. because the Moon has a nearly circular orbit around the Earth4.If the angular size of the Moon in the sky is 30 arc-minute, and the angular size of the Sun in the sky is 32 arc-minute, what kind of solareclipse would an earth-based observer witness, assuming the observer is perfectly aligned with the Sun and Moon? 5.Scientists always phrase their claims in a way that is falsifiable. Which of these statements is most "falsifiable"? 6.Patterns of stars in constellations hardly change in appearance over times of even a few thousand years. WHY? a. Stars are fixed and do not move.b. Stars move, but they move slowly, only a few kilometers in a thousand years. *

ASTR 100 Assignment 4 1. What are the causes of reflection nebulae? What are the essential ingredients (what kinds of astronomical objects) that enable us to see these objects? Reflection nebulae are clouds of dust which are simply reflecting the light of a nearby star or stars. The energy from the nearby star, or stars, is insufficient to ionize the gas of the nebula to create an emission nebula, but is enough to give sufficient scattering to make the dust visible. Thus, the frequency spectrum shown by reflection nebulae is similar to that of the illuminating stars. The sky is blue because tiny particles in the atmosphere (dust, clumps of air molecules, microscopic water droplets) are better at deflecting shorter wavelength blue light than they are at deflecting longer wavelength red light. 2. Find images on the Internet of a "dark nebulae," "reflection nebulae," and "emission nebulae." Pick one example of each category, describe the image.

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