Astr 100 Guides d'étude, Notes de cours & Résumés

Plants and animals are - two small branches of the diverse "tree of life" on Earth. How did oxygen (O2) get into Earth's atmosphere? - It was released by life through the process of photosynthesis Based on DNA studies, it seems that all life on Earth - shares a common ancestor According to fossil evidence how far back in time did life on Earth exist? - about 3.5 billion years or more Which of the following best describes the predominant scientific view of the origin of life on Earth? - ...

Consider a spectroscopic binary star system in which the spectra of both stars are observed. If Star A is more massive than Star B, which star has the greater orbital velocity? a) Star A b) Star B c) They both have the same velocity d) The star that is closest to the center of mass e) It depends on where they are in their orbits - Consider a spectroscopic binary star system in which the spectra of both stars are observed. If Star A is more massive than Star B, which star has the greater o...

QUESTIONS AND ANSWERS

What are the Milky Way Galaxy's spiral arms? - The spiral arms are places where stars are formed from clouds of gas and dust Where are you in the Universe? If you had to give directions to your location in the Universe, what directions would you give? - We are the third planet away from the Sun. Our Solar System is located in one of the spiral arms of the Milky Way Galaxy, one within the Local Group of galaxies Why do astronomers now label Pluto a "dwarf planet"? - Due to its small size ...

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Which of the following statements about light focusing is not true? A) In a healthy eye, light is focused on the retina. B) Film should be placed at the focal plane in a camera. C) If you try to look at an image that is not formed at the focal plane, it will be blurry. D) The focal plane of a reflecting telescope is always located within a few inches of the primary mirror. - D) The focal plane of a reflecting telescope is always located within a few inches of the primary mirror. Suppose t...

D) the same no matter how or where you measure the object's weight. - The mass of an object is A) the same as the weight of the object. B) larger than the weight of the object. C) unrelated to the weight of the object. D) the same no matter how or where you measure the object's weight. A) halved. - If an object's velocity is halved, its momentum is A) halved. B) unchanged, C) doubled D) quadrupled E) dependent on its acceleration.

The apparent motion of a foreground object relative to a distant background as the observers position changes? - Parallax When measuring parallax the distance between two observation points is called? - Baseline If Earth rotated twice as fast as it currently does, but its motion around the Sun stayed the same, then? A. The night would be twice as long B. The night would be half as long C. The year would be half as long D. The length of the day would be unchanged. - B. A long, thin cloud ...

A star has an apparent brightness of -2 and an absolute brightness of 1. What must be true? Select one: a. The star is further than 10 parsecs b. The star is at 10 parsecs c. The star is closer than 10 parsecs d. The star is close to exploding - c What is special about electromagnetic waves? Select one: a. We can see all of them b. They do not need a medium to travel c. They only exist near stars d. Each color travels at a different speed - b A star that has a smaller absolute bright...

We have learned that the centre of the milky way contains a very massive black hole. We developed this understanding by: - Monitoring the orbital motions of many individual stars in the very central parts of the Milky Way If the sun were to be squashed down small enough to become a black hole, then: - The planets in the solar system would orbit the Sun in unchanged fashion (but would receive no light from it) The first stellar mass black hole identified, Cygnus X-1, was found in 1973. The n...