What space mission is currently exploring Mercury? What information has this mission so far provided about the planet?
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A new spacecraft called MESSENGER (Mercury Surface, Space ENvironment, Eochemistry, and Ranging) passed Mercury three times and then entered orbit around the planet in 2011 . It has so far provided extensive photography of Mercury's surface as well as detailed measurements of Mercury's physical properties.
MESSENGER spacecraft found a magnetic field only about 1.1 percent as strong as Earth's.
MESSENGER imaged surface hollows in many locations that may indicate a substantial amount of volatiles were incorporated in the crust and subsequently vaporized.
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Americium-243 has a decay constant of 9.39 × 10-5 years-1. How long will it take for a sample of americium to lose one-third of its nuclei?
A) 2960 s B) 10.6 × 103 years C) 4.32 × 103 years D) 6.44 × 103 years E) 7.84 × 103 years
What combination of quarks produces a proton and what are the electric charges on these quarks, expressed in terms of e?
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Temperature Scales: What is absolute zero on the (a) Celsius scale and (b) on the Fahrenheit scale?
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In general, the greater the mass of the protostar, the ________ it contracts to the main sequence
Fill in the blank(s) with correct word