Astronomy Picture of the Day (2007 Oct. 21)

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Presentation transcript:

Astronomy Picture of the Day (2007 Oct. 21) Explanation: How will our universe end? Recent speculation now includes a pervasive growing field of mysterious repulsive phantom energy that rips virtually everything apart. Although the universe started with a Big Bang, analysis of cosmological measurements allows a possibility that it will end with a Big Rip. As soon as few billion years from now, the controversial scenario holds, dark energy will grow to such a magnitude that our own Galaxy will no longer be able to hold itself together. After that, stars, planets, and then even atoms might not be able to withstand the expansive internal force. Previously, speculation on the ultimate fate of the universe centered on either a re-collapsing Big Crunch or a Big Freeze. Although the universe's fate is still a puzzle, piecing it together will likely follow from an increased understanding of the nature of dark matter and dark energy. Astronomy Picture of the Day (2007 Oct. 21) Will the Universe End in a Big Rip?

Advanced Question Chap. 6, Q34 in P155 Several groups of astronomers are making plans for large ground-based telescopes. What would be the diffraction limited angular resolution of a telescope with a 40-meter objective mirror? (b) Suppose this telescope is placed atop Mauna Kea. How will the actual angular resolution of the telescope compare to that of the 10-meter Keck 1 telescope? Asumme that adapative optics is not used.

Advanced Question Chap. 6, Q34 in P155 Answer: 40-meter objective mirror at 500 nm. Using the formular of diffraction-limited angular resolution (b) 10-meter telescope, the diffraction-limited angular resolution will be 4 times poorer, which is 0.012 arcsec. The seeing at Mauna Kea is 0.5 arcsec. Without adaptive optics (removing the effect of astomspheric turbulance), the 40-m does not preform better in terms of resolving power. Nevertheless, it is able to see deeper into space because of better light-gathering power

Advanced Question Chap. 7, Q22 in P181 Mars has two small satellites, Phobos and Deimos. Phobos circles Mars once every 0.31891 day at an average altitude of 5890 km above the planet’s surface. The diameter of Mars is 6794 km. Using this information, calculate the mass and average density of Mars.

Advanced Question Chap. 7, Q22 in P181 Answer: Using the Newton’s form of Kepler’s third law: The orbital size a = 5980+6794/2=9377km=9.375 X 106 m The orbital period = 0.31891 day = 2.755 X 104 sec The mass:

Advanced Question Chap. 7, Q22 in P181 Answer: The density: