If Neptune's clouds have a temperature of 60 K, at what wavelength will they radiate the most energy?
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- Titans exosphere has a temperature of about 174 K. What is the thermal speed of hydrogen (in km/s) in Titans exosphere ? The mass of a hydrogen atom is 1.67 x10-27kg and Boltzmann's constant is k=1.38 x10-23 Joule/KelvinThe planet Uranus was discovered in 1781, and Neptune, the next planet outward from the Sun, was discovered in 1846. Imagine you're an astronomer in 1846, and you start wondering if there's another planet out beyond Neptune. You decide to try and discover its existence using the same method that was used for Neptune. How will you do this? Group of answer choices You'll recruit a large number of astronomers to use their telescopes to carefully scan the sky in directions that are far from the ecliptic. The regions around the north and south celestial poles will probably be the best "hunting grounds" for the new planet. You'll examine Uranus and Neptune very carefully, on every clear night, for several years, to see if you can find any evidence that sunlight has been reflected off of the `new' planet, then off of Uranus or Neptune, before arriving on Earth. On rare occasions when Neptune passes in front of the Sun, as seen from Earth, you'll look carefully at the Sun (with a safe…The velocity of the solar wind is roughly 400 km/s. How long does it take to travel from the sun to Earth?
- How can astronomers observe through these dusty clouds? What can possibly happen in these clouds in millions of years?Earth tugs the Sun around as it orbits, but it affects the radial velocity of the sun by only 0.09m/s. How large a shift in wavelength does this cause in the Sun's spectrum at 575 nm?