Category Archives: Planets

Planets

Which Planet Orbits our Sun the Fastest?

Question: Which planet in our solar system is orbiting the sun at the fastest speed?  — Mike Answer: Mercury is the winner at an orbital speed of about 47.87 km/s (107,082 miles per hour), which is a period of about … Continue reading

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Does the Coriolis Effect From the Milky Way Rotation Influence the Orbits of Planets in our Solar System?

Question: I read that our solar system orbits the center of the Milky Way Galaxy and am wondering if orbital direction of the planets was initially influenced by the Coriolis effect.  — Jack Answer: Two comments to your question.  First, … Continue reading

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Building a Pyramid on Io for Maximum Durability

Question: If I were to build a 146 meter tall pyramid on the surface of Io, what material(s) would you recommend I use for maximum durability with respect to the satellite’s terrain and climate?  — Evan Answer: I think that … Continue reading

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Did Our Solar System Originally Include a Fifth Gas Giant?

Question: Read an article that researchers at the University of Toronto believe that Jupiter in the solar system early days kicked a planet out of the solar system . Do you believe this could be the one? Many thanks  — … Continue reading

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How Many Earths Can Fit in the Volume of the Milky Way?

Question: How many earths can fit in one galaxy and if the earth were about the size of galaxy how many planets, moons, etc. would be able to fit on earth.  — Xondra Answer: To answer this question you need … Continue reading

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Why is the New Horizons Spacecraft Slowing Down?

Question: Why is New Horizons slowing down? I check it on line every day and its speed is constant. Today its losing speed.  — Tom Answer: I don’t know of any specific reason as to why New Horizons would have … Continue reading

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Does the Sun’s Rotation Speed Dictate the Orbital Speed of the Planets?

Question: Are the planets orbiting the sun at the same speed as the sun revolves on its axis? Or are some planets moving slower or faster than the sun spins, of course the position in the solar system dictates how … Continue reading

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What Are Those Two Bright Lights on the Western Horizon?

Question: On July 15, 2015, observing from Las Vegas, Nevada, there are 2 objects (Low) in the Western sky. One is bright the other dim. Are they Venus and Jupiter?  — George Answer: Yes!  Venus, the brighter of the two, … Continue reading

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What is that Bright Object in the Western Sky After Sunset?

Question: What bright light is in nepa’s sw sky at 30degrees above the horizion at 9:15 edt.  — Tom Answer: Although I don’t exactly know what location you are observing from, I suspect that you are seeing Jupiter and Venus, … Continue reading

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Why Can’t Venus be Fully Lit by the Sun in the Ptolemaic System?

Question: The first known observations of the full planetary phases of Venus were by Galileo at the end of 1610 (though not published until 1613). Using a telescope, Galileo was able to observe Venus going through a full set of … Continue reading

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