Tag Archives: sun

When Will the Sun Expand and Engulf the Earth?

Question: When will the temperature be unbearable here on Earth due to the Sun’s increasing size?  — Charlie Answer: Our Sun will eventually evolve into a Red Giant star, when its surface will extend beyond the orbit of Earth.  This … 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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Why Do High Tides Happen Both on the Side of the Earth Facing Toward and Away from the Moon?

Question: During new moon, moon is between earth and sun. The spring tide then occurs. The height of high tide is higher. But on right side of image why is water having high tide. As there is no force pulling … Continue reading

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Do We Observe the Sunrise Six Minutes After it Actually Occurs?

Question: We know sunlight takes about 8 min to reach earth. So we see sunrise 8 min later. Also we see sunrise 2 min earlier due to atmospheric refraction. Does it mean that we see sunrise after about 6 min … Continue reading

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Why Are Ocean Tides on Earth Larger During a Full Moon?

Question: If I am correct in assuming that the moon’s apparent waxing and waning are merely the effects of the amount of shadow it is in, and it is always the same size, why are the effects of a full … Continue reading

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Is There a Place Where One Can See Daily Radio Images of the Sun?

Question: Is there a place that posts daily images of the Sun in a radio frequency, perhaps 21 cm, something like SOHO does for shorter wavelengths?  — Donna Answer: Unfortunately, I am not aware of a source for regular radio … Continue reading

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The Relative Timing Between Solar and Lunar Eclipses

Question: I’m working on a thesis for the chronology of the last month of Jesus life. According to NASA, as best I can make out, there was a partial Lunar Eclipse about sunset 6-7PM in Israel the day Jesus died, … Continue reading

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Are the Atoms in the Sun in a Liquid or Gaseous State?

Question: Hi, in the school I had an argument with my friend about the sun. I claimed that the sun is composed of the greatest part of the liquid hydrogen and helium , hydrogen and helium gas turns to liquid … Continue reading

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