Questions tagged [venus]
Questions regarding the planet Venus, the second planet from the Sun.
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Does Venus have much more carbon than Earth?
Does Venus have more carbon (as an element) than Earth, and if so, why? Or it is basically the same amount?
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Could it be that Venus was tidally locked in the past but became retrogradely rotating when got a thick atmosphere?
Could it be possible that when Venus was covered with a CO2 or carbohydrate ocean, it was in tidal lock, but when the ocean evaporated, it started retrograde rotation?
It is known that Venerian ...
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Why Venus is the hottest planet, and not Mercury?
Mercury is closer to the Sun than Venus, yet Venus is the hottest planet. Why? Is this caused because of Venus' atmosphere vs. the almost lack of an atmosphere on Mercury?
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Sun rise on Venus from East or West (North as North Ecliptic Pole)
All books and internet articles say that: on Venus the Sun rises from the west, because Venus spins in an opposite direction (inclination ~ 180°).
But I am thinking that: As the spin period of Venus (...
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Why have some space exploration breakthroughs not been retried for the last 50 years?
The last successful probe to land on Venus was Venera 10, 1975. There was also Venera 11 & 12 shortly after, but both experienced camera failures or multiple instrument failures. Why haven't we ...
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Is Venus' north towards Earth's south
Is Venus upside down? Does its north point in the same direction as Earth's south? (roughly) Or does it just spin clockwise and its north points towards Earth's north? (also roughly) It seems that the ...
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Why is it impossible to infer the surface temperature of Venus by spectroscopy observation from earth?
It is well known that the surface temperature of the sun is determined by fitting the sunlight with the black-body spectrum.
Why is this inappropriate for Venus?
I have the question because of the ...
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What is the ring of light around the moon and which star seen near it?
In this amatuer photograph, the following are to be noted:
There is a faint ring of light around the moon. What is the distance we see this at. From the ground it looks like a hundred meters.
There ...
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Does the reflected light from Earth boost Venus' apparent magnitude when it is seen transiting the Sun?
During solar transits of Venus as seen from Earth, exactly 0% of Venus' disk is illuminated by sunlight, as expected. However during these transits, Earth is at opposition and fully illuminated by the ...
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How close can Venus be to the sun in the sky and still be visible to the naked eye?
Assuming no artificial light, what is the minimum number of degrees apart would the sun and Venus have to be during the beginning of civilian twilight for the planet to be visible to the naked eye to ...
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Is Venus in our sun's habitable zone?
I know that Venus is closer to the sun than Earth and if an article I read is to be believed, Venus is hotter than Mercury even though the latter is closer to the Sun. The explanation for this odd ...
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When did Venus get as hot as it is now?
My previous question turned out to not ask the question I thought I was asking.
I have read that Venus began its heating-up around 700-750 million years ago.
When did the Venusian atmosphere get ...
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When did Venus reach approximate radiation equilibrium?
I have read that Venus is roughly at radiation equilibrium - that is, heat out is approximately equal to heat in. I have also read that Venus began its heating-up around 700-750 million years ago.
My ...
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Is Venus' magnetosphere actually more powerful than the solar wind's magnetic field that induced it or vice versa?
Is the Venusian magnetic field actually more powerful than the solar wind's magnetic field that induced it? I know that Venus' magnetic field is not due to Magnetohydrodynamic processes rather, it is ...
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3rd brightest ever object in the sky
What’s the 3rd brightest ever recorded object in the sky?
For example Venus is normally the 3rd brightest object in the sky.
However there have been the occasional comet or Supernova that have ...
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What would happen if Venus and Earth collided?
The first thing we would need to consider is that Earth has already been hit by a protoplanet half its size 4.5 billion years ago, meaning the Earth may have a chance of staying intact after the ...
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How do the phases of Venus prove heliocentrism?
I have been doing research about the Copernican Revolution, and one of the main arguments that caused many astronomers to change their minds was Galileo's observation of all phases of Venus.
The proof ...
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Why is Venus's atmospheric pressure 75 times that of earth when carbon dioxide is only 1.5 times heavier than air?
Obviously I have forgotten by basic college chemistry. I am getting carbon dioxide at 1.87kg per cubic meter and compared it to nitrogen and oxygen but source says carbon dioxide is 1.5 times heavier ...
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Why doesn't the IAU definition of "Planet" disqualify Mercury and Venus as planets?
Here's the IAU definition of a planet (source):
A celestial body that (a) is in orbit around the Sun, (b) has
sufficient mass for its self-gravity to overcome rigid body forces so
that it assumes a ...
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See Venus in daylight
At what distance (in angular degrees) from the Sun, could we see Venus, in mid daylight, with a pair of binoculars (7x50)?
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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 ...
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Is there a term for a Venus visibility period
Is there a term for the period of time when Venus is first visible in the evening to when it switches to being the "morning star", or vice versa? For example, as depicted in the image below,...
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How could we detect if Venus or mars were being terraformed by aliens? [closed]
If any other body in our solar system was being terraformed by aliens, what would be the ways in which we would detect this?
Initially I thought of Venus or mars but I guess this could extend to any ...
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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 ...
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Does anybody know how to solve this Earth-Venus-Sun problem?
How can I find (in terms of the angle) the moment when in the system Sun-Earth-Venus, Venus can be seen the most bright if its brightness (flow received in Earth) is proportional to the size projected ...
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How could Mars' atmosphere be shed by solar winds, when Venus has a thick atmosphere despite no magnetic field?
Our current understanding of how Mars lost its atmosphere is because it lost it magnetic field, due to a barrage of reasons, such as core cooling due to low volume and cooling off quickly. This ...
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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 ...
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How would the synodic period of Venus appear to change if both planets were moved 10 million additional miles away from the Sun?
Let us say that Earth and Venus are both moved 10 million additional miles from the sun. How would the synodic period of Venus appear to change for an observer on Earth? If 584 days is Venus' current ...
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Eastern star at night 2022 July 10 [closed]
What is the star in the eastern sky tonight with a moon or planet at the 7 o’clock position?
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What stars am I seeing in the daytime?
I currently live in the United Kingdom, in an area where the overall elevation is high so while the hills are rolling rather than peaky, they are all well above sea-level. A few weeks ago I was on a ...
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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'...
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Could a magnetosphere be created for Venus by recreated by spinning-up the planet to a 24 hour day?
If Venus in it is current state, started rotating at the same rate as Earths 24hrs rotation, would it develop a magnetic field of roughly the same strength as Earth's?
If so, would that help in any ...
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What would happen if Venus was hit by a Chicxulub-like meteor?
What would happen if Venus was hit by a Chicxulub-like meteor? Would the dense atmosphere and high surface pressure and temperature lead to a different result compared to what happened here on Earth?
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Would a system consisting of Earth and Venus orbiting around a common center be stable in the long-term?
Earth and Venus and very close to each other in mass and would both orbit around a point in space positioned almost perfectly in between the two.
Assume that this system is 1 AU from the Sun and the ...
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Which Venus scientists discovered the hole in the ozone layer?
After 21:00 in Venus: Earth’s Evil Twin or Just Misunderstood? (live public talk) from the JPL YouTube channel the person being interviewed "Sue Smrekar, Rocky ...
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When can Moon occult Venus?
I'm trying to solve this task:
At what age of the Moon (in days after the new moon) is it possible for the Moon to occult Venus?
How I was solving it:
Angular velocity of the Moon is 13.2 degrees ...
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What discoveries were made thanks to Pioneer orbiter data?
Based on the Wikipedia page Pioneer Venus Orbiter (also known as Pioneer Venus 1, Pioneer 12, 1978-051A) there were quite a few scientific instruments on board. But what scientific results were ...
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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 ...
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Why does Earth have a dip in the CO2 absortion spectrum from 14 to 16 micron?
This paper shows that there is a dip in the CO2 absorption spectrum of Earth. In essence the trough of the absorption of CO2 for Earth is cut into two separate troughs instead of 1 large trough. Why ...
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Why can't ptolemaic Venus be fully lit?
In wikipedia's article on the phases of Venus it says:
The Ptolemaic system would never allow Venus to be fully lit from the perspective of the Earth, as this would require it to be on the far side ...
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Has Hubble photographed Venus in near IR? If so how does it compare to the new and exciting Parker Solar Probe image?
Phys.org's Parker Solar Probe offers stunning view of Venus includes the image below taken by the Parker Solar Probe during it's most recent gravitational assist flyby of Venus as it continues to rid ...
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Solar wind, Earth wind and planetary winds?
In February 2021, a new form of "electrified gas breeze" was announced, see blog by Tony Phillips entitled A New Form of Space Weather: Earth Wind which might a possible explanation for ...
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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 ...
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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 ...
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Moment of inertia factor of Venus and Pluto
Wikipedia's Moment of inertia factor begins:
In planetary sciences, the moment of inertia factor or normalized polar moment of inertia is a dimensionless quantity that characterizes the radial ...
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What does the amino acid found in the atmosphere of Venus mean?
An amino acid is a part of DNA, but it has only been found on Earth. Is the amino acid maybe from one of the space vehicles that has orbited, scanned, or surveyed Venus? How can a part of DNA survive ...
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Extraterrestrial snow?
What do we know about extraterrestrial snow? On which (exo)planets or (exo)moons do we have direct hints for its existance? This is indeed a children's question, but I struggle to answer it ...
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Launch windows for Venus transit; how to convert heliocentric longitudes to date?
Being a bit familiar with celestial mechanics, I know that the Hohmann transfer orbit is the quickest way to transfer between two circular orbits of different radii around a central body in the same ...
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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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