aeroalias
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What causes the antipodal bulge?
23 votes

That is because the moon attracts both the water and the earth. The gravity of the moon reduces with distance (by the inverse square law). So, the moon's gravity is Greatest at the point nearest to ...

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What was the largest telescope ever fitted with an eyepiece
8 votes

From this answer, it seems that the Harlan J Smith telescope located at the McDonald Observatory, in Texas, with a 107-inch (2.7 m) aperture is the largest aperture telescope that was ever fitted with ...

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How does the appearance of the analemma vary with latitude
Accepted answer
7 votes

Analemma is a diagram showing the deviation of the Sun from its mean motion in the sky, as viewed from a fixed location on the Earth. Note that it says nothing about time- it can be any fixed time. ...

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Can we simulate Earth's gravity in space?
Accepted answer
6 votes

Simulating gravity in space basically means simulating weight, which requires acceleration. So basically, the question is, how do we create acceleration in space. The easiest method for simulating ...

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How many constellations in the Zodiac?
Accepted answer
6 votes

There are thirteen modern constellations in the Zodiac. In modern astronomy, a constellation is a specific area of the celestial sphere as defined by the International Astronomical Union. In total, ...

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Why can falling stars only be seen moving down towards horizon not up away from horizon?
5 votes

The falling star or shooting star has nothing to do with a star. If shooting stars were actual stars, we'll be burning in their atmosphere, rather than the other way around. When a meteoroid, comet ...

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How are the gaps filled in images captured by CCD arrays?
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4 votes

In general, the common practice is to dither exposures and fill in the gaps. The dither serves multiple purposes: provides some exposure in the gaps between the CCDs smooths out pixel-to-pixel ...

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What's the distribution curve for meteor sightings?
Accepted answer
4 votes

The meteor sightings in a meteor shower can be approximated to a normal distribution. In fact, research papers use a normal distribution to model meteor showers. The exact characteristics of the ...

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How can we focus radio telescopes on a star when the earth is spinning?
3 votes

The way telescopes work is pretty much the same in the optical and radio wavelengths- the telescopes collect electromagnetic radiation, rather than focusing at a point. There are multiple reasons for ...

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How is the heat production inside moons compliant with Conservation of Energy?
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3 votes

The heat production inside moons is due to tidal heating. Due to this, the orbit of the moon would change. The orbital and rotational energy of the moon is dissipated as heat either in the surface ...

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What is the mass limit in a stellar accretion disc?
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3 votes

The accretion disc is formed by material in orbital motion against a central body, which can be a star. The size, mass and other characteristics are usually determined by the central object, in this ...

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When a neutron star accretes matter, will its mass increase?
2 votes

The neutron stars have about 1.1 to 3 solar masses. If the neutron star accretes mass, its mass will increase and once it crosses the Tolman–Oppenheimer–Volkoff limit, the star will collapse to form a ...

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