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Why is the Sun almost perfectly spherical?

Relatively recent measurements indicate that the Sun is nearly the roundest object ever measured. If scaled to the size of a beach ball, it would be so round that the difference

2024 Sep 11

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Why is the Sun approximated as a black body at ~ 5800 K?

Approximating the sun as a black body effectively means that it''s surface temperature is 5800K. And, indeed, if we look at the most dominant wavelength of the sun

2025 Feb 19

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astronomy

It''s consensus that the very similar apparent sizes of the Moon and the Sun as seen from Earth is a coincidence (as already answered in this site). This provides us with

2024 Jun 04

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How long until the sun cannot sustain human life on earth?

The sun will last, at its current brightness for 9 billion more years. How long until the sun gets burned down to the point where it cannot sustain life on Earth anymore?

2025 Oct 15

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sun

The sun''s spectrum is very complex, and indeed there are a lot of "lines"—both light and dark (emission and absorption)—amidst a sea of what looks to be continuous frequencies.

2025 Jan 25

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How is Earth protected from the gamma rays generated by

The Sun is generating energy by nuclear fusion. This nuclear fusion will emit energy in the form of gamma rays. Normally, the earth''s ozone layer filters the ultraviolet radiation

2025 Jul 25

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Nuclear fission in the Sun

The Sun''s energy comes primarily from fusion of light elements in its core. It is estimated that a very small fraction of mass of the Sun (~$10^{-12}$ times the abundance of

2025 Nov 29

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How much lux does the Sun emit?

I want to know how much lux the sun emits on a bright day - I don''t mean when one stares directly at the sun, but rather when one walks casually outside when the sun is

2025 Jul 01

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What is actually meant by ''sun set'' and ''sun rise'' times, when

If this is the case, then when we read things like what time sun sets and rises on websites, books, calendars, other official times, et al does that mean when we see for

2024 Dec 25

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Why does the Sun "shine brighter" some days? [duplicate]

1) The sun seems brighter (more dazzling) if there is more scattering in the atmosphere. The sun would actually look very small to us in the sky if there were no

2025 Jul 08

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