Tag Archives: physics

Do Radio Sources “Twinkle”?

Question: Usually observations with radio telescopes are not affected by rain, clouds etc. but recently i heard scintillation effects can affect observations with radio telescopes. I want to know why it is affected by that. – Anjali Answer: Radio observations … Continue reading

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What if the Sun did not turn into a Red Giant and the Moon moved out of its Orbit Around the Earth?

Question: What effects would we see on Earth if the Sun wouldn’t turn into a Red Giant? If the Moon would move away slowly until extracted from its orbit, would that, for example, affect Earth’s axis?  – Walle Answer: If … Continue reading

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Equation for Orbits?

Question: Why does the following equation seem to predict stable orbits around the sun as well as for moons around planets without any involvement of balancing centripetal and gravitational forces. The following is the equation that in my investigation seems … Continue reading

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Do Gravitational Waves Need a Medium to Travel Through?

Question: Do gravitational waves need a medium to travel. Do they slow down when passing through a medium?  – Michael Answer: Gravitational waves are best described as distortions in the fabric of space that are due to objects with mass.  … Continue reading

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The Light-Year-Long See-Saw Conundrum

Question: A lunch friend and I are debating this question. Essentially, consider a see-saw, a board or rod with a fulcrum in the middle.  This rod is made of unbendable, nondestroyable fictional material.  It will not bend. Make this rod … Continue reading

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Are We Seeing Stars as They Were in the Past?

Question: If we can see the light coming from stars billion years away, and if some of these stars don’t even exist anymore, does this mean we are literally starting at the past?  – James Answer: Yes.  Since all of … Continue reading

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Why isn’t the Precession of the Lunar Nodes Uniform with Time?

Question: I am an amateur naked eye astronomer.  I teach astronomy to 6th graders, I read a lot on the subject, and I do a lot of experiments and observations to better understand the movements of the sun, moon, etc. … Continue reading

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Can One Make Measurements of Line Emission at 16.4 GHz?

Question:  Is it theoretically possible to separately measure hydrogen 1s 2s transition absorption and emission line frequencies? They are assumed to be the same but a small difference in the order of 16.4 GHz is proposed. Alternatively – associated with … Continue reading

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Apparent Motion at the Speed of Light

Question:  If there was a super long empty truck moving half the speed of light and inside it is, lets say a vehicle that also moves half the speed of light, will it go near or at the speed of … Continue reading

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How to Calculate the Flux of a Supernova Remnant

Question:  Good day Sir. How is work? Please I kinda need help. I have a question disturbing my mind. This is question. There is a radio source with the following attributes: Object name: 3C461 RA (hh mm ss): 23 23 … Continue reading

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