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Questions tagged [venus]

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

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7 votes
2 answers
465 views

Venus' magnitude during inferior conjunction

I was doing an assignment on Stellarium when I observed Venus to have an apparent magnitude that didn't become less negative than -3, even at inferior conjunctions when we faced the dark side of Venus....
Diaa Eldin Malek's user avatar
31 votes
2 answers
5k views

What is the current accepted theory as to why Venus has a slow retrograde rotation?

According to this NASA overview, the planet Venus is unique (amongst the major planets), Venus has a slow retrograde axial rotation, taking 243 Earth days to make one rotation (which is longer than ...
user avatar
10 votes
1 answer
1k views

How (the heck) was this photo of Venus at inferior conjunction (between us and the Sun) taken?

This great answer by @gerrit discussing planetary phases seen in visible light contains the image I've included below. According to the Wikimedia Commons link these are ESO images from the Venus ...
uhoh's user avatar
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39 votes
3 answers
20k views

Is Venus in some way tidally locked to... Earth?

The video here demonstrates how Earth sees the same face of Venus every inferior conjunction (i.e., two planets are the closest to each other): https://www.youtube.com/watch?v=4m_ouMC61-w (or https://...
puzzlet's user avatar
  • 499
57 votes
2 answers
5k views

Why has Venus's atmosphere not been stripped away by solar wind?

This answer on Space Exploration to a question about Mars says that one reason Mars has such a thin atmosphere is because it lacks a magnetic field to protect it from the effect of double solar winds. ...
called2voyage's user avatar
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44 votes
3 answers
45k views

Why did Venus not lose its atmosphere without a magnetic field?

It is often stated that the magnetosphere not only shields the planet from cosmic radiation, but also prevents atmospheric loss. Why then did Venus not lose most of its atmosphere if it doesn't have a ...
Irigi's user avatar
  • 1,142
9 votes
4 answers
9k views

How to calculate conjunctions of 2 planets

So, the recent conjunction of Jupiter and Venus seems to have spawned lots of excitement over this "rare" event. But what I can't figure out, is exactly how rare it is. And I've seen such conflicting ...
AdamMasters's user avatar
8 votes
1 answer
478 views

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 ...
uhoh's user avatar
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7 votes
3 answers
25k views

Why does Venus flicker?

I was watching Venus with the naked eye yesterday at about 7 pm and I noticed that it was flickering, almost like a star. I have always learned that planets don't flicker to the naked eye, only stars ...
TomCho's user avatar
  • 390
7 votes
1 answer
881 views

Effects of the solar tide on planets

It’s well known that (lunar) tides on Earth result in a transfer of angular momentum from Earth proper to the Earth–Moon orbital motion. That’s why the Moon resides now in a high Earth orbit, and ...
Incnis Mrsi's user avatar
11 votes
2 answers
2k views

Are there ever any simultaneous transits of both Mercury and Venus as seen from the Earth?

Transits of Mercury happen fairly frequently due to its short period, but transits of Venus are less frequent. I've looked over the data available to me and found that there have been transits of ...
Cyberherbalist's user avatar
10 votes
2 answers
7k views

Has the conjunction between Venus, Jupiter, and Regulus only occurred twice in 2,000 years?

I recently heard the claim that mid-July, the "Star of Bethlehem" formed for the first time in 2,000 years, where the Star of Bethlehem is a three-way conjunction between Venus, Jupiter, and Regulus. ...
El'endia Starman's user avatar
7 votes
2 answers
3k views

Can we find rocks from Venus or Mercury on Earth?

As we know, we can find rocks from Mars on Earth, how about Venus and Mercury? Is that not found yet? Or it is impossible to find them because they are closer to the Sun, and debris won't go far away ...
Gstestso's user avatar
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6 votes
1 answer
635 views

Why Venus evolved so differently from Earth?

I read somewhere that the reason why Venus has a runaway greenhouse effect and Earth doesn't is the former's inability to form separate tectonic plates due to slightly higher temperature softening the ...
Meatball Princess's user avatar
1 vote
3 answers
752 views

Brown Dwarf transcending past the sun with the naked eye [closed]

I seen with my naked eye in mid 2014 from Ca. right after sunrise a black spot in front of the Sun.I observed it for about a hour with my naked eye. Here is a picture that closely resembles what I ...
user5434678's user avatar
36 votes
2 answers
6k views

How was the mass of Venus determined?

The mass of Venus seems rather complicated to determine to me: Venus doesn't have any satellites, so you can't just apply Kepler's third law (like you would with Jupiter or Saturn for instance) to ...
usernumber's user avatar
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24 votes
2 answers
5k views

Can the Moon eclipse Venus?

The title basically says it all. As seen from the Earth, is it possible for the Moon to eclipse Venus (or any other planet) or are the orbits inclined such that this never happens? If such an eclipse ...
CatchAsCatchCan's user avatar
19 votes
4 answers
16k views

If Venus and Mars changed places, would we then have 3 habitable planets?

This is the supposition: Venus is too hot, Mars is too cold. If they switched places then Solar energy would change to make both more Earth-like. We might as well have had three instead of just one &...
LocalFluff's user avatar
  • 11.4k
19 votes
4 answers
5k views

Is the Earth going to evolve towards Mars' fate or Venus' fate?

Upon reading on this site (and many others), one can think that Mars might have supported life in a distant past (discovery of liquid water, valleys, mountains...). On the other hand, Venus is the ...
Nico's user avatar
  • 803
12 votes
1 answer
1k views

Mars vs Venus: the retention of atmospheres in relationship to Earth

Correct me if I'm wrong, but the factors than enable a planet to retain or lose an atmosphere seem to be: 1. Magnetic Field, 2. Solar Winds, 3.Weight of Gases, 4. Planetary Temperatures. 5. Distance ...
Peter Wilson's user avatar
11 votes
2 answers
810 views

Could an impact have resurfaced Venus 300 million years ago?

Venus surface isn't older than about 300 million years. The only explanation I've come across is that some kind of global volcanism resurfaced the planet. But couldn't it have been an impact event? A ...
LocalFluff's user avatar
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8 votes
2 answers
709 views

How can it be known that Venus does not have plate tectonics?

This answer provides some insight into Venus' surface geology: Water may be necessary as a lubricant for plate tectonics. Whether or not this is the case, Venus does not have plate tectonics. It ...
uhoh's user avatar
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7 votes
2 answers
245 views

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 ...
B--rian's user avatar
  • 5,626
6 votes
1 answer
631 views

How are sulfuric acid clouds able to completely cover Venus?

It is a well-known fact that an opaque layer of highly reflective clouds of sulfuric acid completely shrouds Venus preventing its surface from being seen from space in visible light. This is mentioned ...
Nilay Ghosh's user avatar
  • 4,694
6 votes
2 answers
230 views

Are the Venusian "continents" likely to have existed before the global resurfacing event?

A topographic map of the surface of Venus shows the large highland areas Ishtar Terra, Aphrodite Terra and Lada Terra that have occasionally been described as "continents", plus various ...
user avatar
5 votes
1 answer
1k views

Is there light on the surface of Venus?

A simple question: is there light on the surface of Venus?
Beta Decay's user avatar
5 votes
1 answer
171 views

Does lightning on Venus affect the chemical composition of the clouds?

It is established that lightning occurs on Venus due to the presence of sulfuric acid clouds. Does this constant electric discharges and possible electrolysis affects the composition of the clouds on ...
Nilay Ghosh's user avatar
  • 4,694
4 votes
1 answer
109 views

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 ...
Michael Bonnet's user avatar
4 votes
1 answer
126 views

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)?
Jacquelin Hardy's user avatar
2 votes
2 answers
3k views

Do we see planet venus everyday?

Do we see planet Venus every day? (Just before sun sets or Just after sun sets) throughout year? or some days we don't see it?
Adam 's user avatar
  • 37
2 votes
0 answers
123 views
+400

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
  • 30.7k
2 votes
1 answer
272 views

Are lunar occultations visible to the naked eye?

The Moon occults a lot of stars. But are these events visible to the naked eye? Won't it be blinded out by the crescent even at its thinnest just before sunrise? Did ancient astronomers actually ...
LocalFluff's user avatar
  • 11.4k
1 vote
2 answers
21k views

How can we see Venus at night? [closed]

According to the Globe Earth Theory, the Sun is in the middle of the Solar System and the Earth is the 3rd planet from the Sun, making Mercury and Venus between Earth and the Sun. If this is true, ...
JT Stonne's user avatar
1 vote
0 answers
107 views

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,...
B--rian's user avatar
  • 5,626
1 vote
3 answers
252 views

Can you see the difference with the naked eye whether Venus is at the other side of the Sun or at the Earths' side?

When Venus is at an angle with the Sun from the Earth's perspective we are able to see the reflection of the Sun on Venus. But imagine that Venus is on the farthest half of its orbit around the Sun. ...
Marijn 's user avatar
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