Molecular clouds are mapped using CO instead of hydrogen because CO is much more abundant than hydrogen in molecular clouds
Indicate whether the statement is true or false
F
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Given that Earth's actual distance from the Sun varies by less than 3% over the course of a year, why does the diagram look so elliptical?
A) It correctly shows that Earth is closest to the Sun at points A and C and farthest at points B and D. B) The elliptical shape is an effect of perspective, since the diagram shows an almost edge-on view of a nearly circular orbit. C) The shape of the diagram is meaningless and is done only for artistic effect.
Stars form from a collapsing cloud that fragments into smaller and smaller pieces. This process takes about
A) 10,000 years. B) 25,000 years. C) 100,000 years. D) a few million years. E) 100 million years.
What is a meteorite?
A) a streak of light caused by a star moving across the sky B) a comet that burns up in Earth's atmosphere C) a streak of light caused by a small particle from space burning up in Earth's atmosphere D) a fragment of an asteroid from the solar system that has fallen to Earth's surface E) a small moon that orbits one of the giant planets
A plano-convex lens is to have a focal length of magnitude 40 cm, and it is made of glass of index of refraction 1.65. What radius of curvature is required?
A) 32 cm B) 26 cm C) 13 cm D) 36 cm