Top new questions this week:
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I had a horizontal sundial made specially for my latitude (approx. 38° N). The default correct way to orient a sundial (in the northern hemisphere) is with the gnomon pointing towards polar north. The ...
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When did we start using the phrase "terrestrial planets" to refer to the inner planets in English scientific writing?
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I've been looking at the OGLE Collection of Variable stars for the purposes of making a machine learning model to classify variable stars by their plots. In each variable star, I see the following ...
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Given some redshift z, how do we find the distance using the cosmological red shift formula (and presumably the Friedmann equations)? a = 1/(1+z), and we can assume that omega_0 = 1. I know a ...
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On the wikipedia page of the nova is said that the CNO cyle, which converts hydrogen into helium, starts on the surface of the white dwarf when the temperature reaches about 20 million K.
My question ...
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The Local Interstellar Cloud (LIC) is a low-density interstellar cloud which embed the Sun and other stars.
How did this region form? I suppose a supernova or stellar winds from multiple stars may ...
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I understand that the blue loop is a loop in the HR diagram performed by stars from 2-8 solar masses. I was curious as to why they occur, but when I researched all I got is that it is when the star ...
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Greatest hits from previous weeks:
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I understand this is a silly hypothetical but I'm asking for a 7 year old so please bear with me.
Imagine an interstellar stray gas giant comes flying through our solar system.
If we were not ...
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I think I am not alone who saw videos about that we (humans) are made of same atoms which someday were in stars. In other words, some atoms in our bodies are from stars which exploded billions of ...
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I am thinking of a partial lunar eclipse where the Sun has not set yet but all three celestial objects are at such an angle that the Earth can cast some of its shadow on the Moon. Is such a scenario ...
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Last night, I was on my balcony at 1AM (PST) and I looked up and saw two stars near the horizon (I'd guess ~30 degrees above the horizon), and they were "twinkling" about twice as fast as other stars ...
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I wonder, how did our ancestors discover the Solar System? They did not have any telescopes to see distant objects, right? Even a planet looks like a star from a distance.
They discovered the ...
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Why do all objects burn when they enter our atmosphere? is this because of our atmosphere composition? and does this happen on other planets as well?
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I keep hearing that you can go blind during a solar eclipse.
Is the sun actually any brighter during a solar eclipse? This is how the media seems to frame it, and they suggest you need special ...
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Can you answer these questions?
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I'm using Skyfield to calculate some ecliptic longitudes for various dates. I understand that the 0° point of ecliptic longitude changes based on precession due to being the intersection between the ...
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When asking Horizons for ephemeris, it doesn't include the information of the rotation axis. Is there a way to obtain it?(may include calculations based on the given information)
And is there any way ...
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I'm well familiar with SGP4 and its implementations in various languages. I am curious if there are open-source implementations of J2Mean, J2, J3, J4, etc propagation techniques.
If my terminology is ...
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