Tag Archives: physics

Why is the New Horizons Flyby of 2014 MU69 So Much Closer than its Pluto Flyby Distance?

Question: There is talk of New Horizons travelling to another object in the Kuiper Belt. The fly by will be at about 1900 miles, much closer than the fly by of Pluto. How are the distances of observation of these … Continue reading

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What is the Distance to the Moon and How is it Measured?

Question: What is the true distance of the moon from the surface of the earth, since VLT @ Paranal can shoot a high powered laser to measure the distance? Based on surface temperatures recorded by NASA, it appears to be … Continue reading

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What Happens to the Other Planets in the Solar System if Jupiter is Removed?

Question: What would happen to the other planets in the solar system if we removed Jupiter?  — Willie Answer: Instantaneously removing Jupiter from the solar system would have little effect on Earth and the other planets.  This is due to … Continue reading

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Who Gets to be the First to Know When Something is Discovered?

Question: When you discover something, Who do you tell first.  — Jason Answer: Most scientific discoveries are first communicated through a research paper which has been reviewed by an independent and knowledgeable scientist not affiliated with the research that led … Continue reading

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Why Do Stars Look Like Points of Light Rather than a Uniform Haze of Light?

Question: Hi, I’ve a question I’ve wondered about for some time. I will try to be as succinct as possible. As I look at the night sky, I see many stars. These stars are all emitting photons at an astounding … Continue reading

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Radio Caustics and Cusps in the Earth’s Ionosphere

Question: Hi! My question is about ionospheric caustics (IC). In dynamic spectra of several radio telescopes during daily solar observations there are unusual patterns. They are not identified with well-known solar radio bursts. I found that Bruny Island Radio Spectrometer … Continue reading

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Calculating Mean Solar Radiation Flux Absorbed Per Unit Area at Earth

Question: The mean solar radiation flux absorbed per unit area of Earth’s surface is calculated as FS(1-A)/4, where FS is the solar constant and A is albedo. I can see how this would be valid for a sphere illuminated from … Continue reading

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If the Sun Suddenly Disappeared Would We Notice It Immediately?

Question: Hi National Radio Astronomy Observatory people!  My name is Israel Romero and I am a Software Engineer.  So, I have this hypothetical experiment. Let’s say that suddenly, the Sun disappears in space… it just vanishes.  My assumption is that … Continue reading

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What Does the VLA See or Hear?

Question: What do the VLAs actually “see” or “hear?” A recent report states Apollo 10 astronauts “heard” strange music in their radio systems on the dark side of the moon, where they were isolated from the interference produced on Earth. … Continue reading

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What Methods Have Scientists Used to Confirm the LIGO Discovery of Gravity Waves?

Question: Information says that the gravitational waves, recently detected by LIGO, correspond (according to Einstein theory equations) to the effect of two black holes merging (with the masses of both black holes being estimated). So the fact of two celestial … Continue reading

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