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Questions tagged [venus]

Questions regarding the planet Venus, the second planet from the Sun.

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Did simultaneous transits of Mercury and Venus actually last occur in 373,173 BC?

According to the Wikipedia article for Transit of Venus, the last time a transit of Mercury and a transit of Venus occurred at the same time was 22 September of 373,173 BC. This is a Featured Article ...
Johansson McFleppers's user avatar
5 votes
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Why aren't there sulfuric acid seas on Venus?

It's commonly known that sulfuric acid rain doesn't reach Venus' surface. It evaporates instead because the surface it too hot. But considering how high the pressure at the surface (9.3 MPa), shouldn'...
Prido1024's user avatar
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Measured values of the solar irradiance at other values than 1 AU?

It is straight forward to estimate the total solar irradiance of a planet using the Earth's solar constant, and scaling it according to the (mean) distance of the planets. But for which planets have ...
B--rian's user avatar
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Records of Venus transits prior to 1761

Following the publication in 1716 of Edmond Halley's method to determine the solar parallax with the transit of Venus, many expeditions were launched to observe the 1761 transits. The following ...
usernumber's user avatar
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Are stagnant-lid Earth analogues guaranteed to become Venus-like?

In our current understanding of Venus, two things are generally accepted: Venus reached its thermal tipping point at least 700 Ma. As the Sun's luminosity gradually increased with age, its average ...
Thoth's user avatar
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Has "crescent-twinkling" even been demonstrated or at least calculated/predicted? Any "twinkleometer" data for Venus out there?

My new answer to Why does Venus flicker? addresses something that I find particularly interesting; Venus can be an incredibly thin crescent at times, and even a 1 arcminute large thin ring with an ...
uhoh's user avatar
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More on NASA's "blockbuster return to Venus" and what is in for astronomy?

On June 2nd, 2021, I read an Science-article with the click-baiting title Venus can’t wait—NASA plans blockbuster return to hothouse neighbor which mainly refers to a NASA press release from the same ...
B--rian's user avatar
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On Venus, what substances are likely to be found that are liquid in the temperatures and pressures and are there pools of the stuff?

It's clear that there is no water on Venus. But with temperatures hot enough to boil lead, well, couldn't there be pools of lead on the surface? Or pools of other things, like sulfur? Is there any ...
Greg's user avatar
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How bright does Venus appear from the moon if it replaced Earth?

If you were standing on the moon, Earth will appear mostly around -17.7 at maximum brightness. However, since Venus has a higher albedo than Earth, Venus would be brighter. What would be Venus's ...
InfinitySwordofDiamond's user avatar
1 vote
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Characteristics of Venus' jet streams?

Since the Voyager missions, the atmosphere of Jupiter received great attention, its jet streams made it into text books on geofluid mechanics, including their characteristics like the how they meander,...
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Observed meteors on Venus?

In an article on Venus by JPL from 1996 I read Due to the dense Venusian atmosphere, primary impact craters of less than a 3 kilometer (2 mile) diameter are nonexistent. I am now wondering whether ...
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Background radation on Venus?

Venus is often refered to as Earth-twin, simply because of its similar size. In the very hypothetical case of a human mission to Venus, and leaving the all other challenges of Venus toxic atmosphere ...
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Are there any ALMA or JCMT detections of extraterrestrial phosphine that have been confirmed by direct sampling?

Please note that I am not a professional astronomer but an interested layman. I've informed myself on the matters below by perusing arXiv--there are likely other publicly-accessible primary sources I ...
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Planets sidereal periods

When was Mars 686 , Venus 224 and Mercury 87 days sidereal period was discovered , was it discovered by the ancients or after Copernicus
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