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37 votes

Is Venus' north towards Earth's south

This is a matter of defintion and convention, not science. By convention "North pole" is defined to be the pole that lies to north side of the solar system's "invariable plane" (...
James K's user avatar
  • 123k
32 votes
Accepted

Why is it impossible to infer the surface temperature of Venus by spectroscopy observation from earth?

The important difference is that the word "surface" has a different meaning depending on whether we're talking about the Sun or Venus. When we say "the surface of the Sun," we ...
Tanner Swett's user avatar
18 votes

What would happen if Venus and Earth collided?

The outcome of a Venus - Earth collision depends on the impact speed. At a relatively low speed, the matter is likely to condense to form a new planet. But if the speed is high enough the planets will ...
PM 2Ring's user avatar
  • 14.8k
18 votes

What would happen if Venus and Earth collided?

This is the kind of thing that computer simulations are done for, but I am not aware of any that were specifically for a Venus-sized body hitting the earth. The specific details would depend very much ...
Mark Foskey's user avatar
  • 3,916
18 votes

Why is it impossible to infer the surface temperature of Venus by spectroscopy observation from earth?

I think the problem is that spectroscopy at visible and infrared wavelengths simply can't penetrate the thick atmosphere of Venus. Thus the information comes from much higher in the atmosphere and not ...
ProfRob's user avatar
  • 153k
14 votes

What is the ring of light around the moon and which star seen near it?

If the photo is from today (24 November 2023), then the "star" is Jupiter, a planet. It's hard to see any ring around the moon in the photo, but rings are typically due to high clouds, and ...
Dr Chuck's user avatar
  • 4,339
10 votes

What is the ring of light around the moon and which star seen near it?

tl;dr astrophotographers shouldn't carry their cameras in their pockets :-) I took photos of the Moon and Jupiter with my cell phone last night as well. I keep my phone in my pocket and the lens ...
uhoh's user avatar
  • 30.5k
6 votes

Is Venus in our sun's habitable zone?

What are the inner and outer edges of the Sun's circumstellar habitable zone or Goldilocks zone? Here is a link to a list of about a dozen estimates made in the last 60 years, some using complex ...
M. A. Golding's user avatar
6 votes

What is the ring of light around the moon and which star seen near it?

Answering only the 2nd question, "There is a star near the moon. Is this Venus?", as others have noted, it's not Venus, it's Jupiter. But it's interesting to note that, assuming the moon in ...
scottbb's user avatar
  • 161
6 votes

How do the phases of Venus prove heliocentrism?

Venus is never in opposition to the Sun. Venus goes through all its phases within about 47 degrees of the Sun. The crucial point is to observe that there is a correlation between the angular size of ...
ProfRob's user avatar
  • 153k
5 votes

How do the phases of Venus prove heliocentrism?

The key point is that Venus always goes in a tiny little circle in front of the Sun, in the geocentric model. This was a necessity as they always saw that Venus was close to the Sun, in the morning or ...
2x_espresso's user avatar
5 votes
Accepted

How do the phases of Venus prove heliocentrism?

As ProfRob pointed out, Venus is never in opposition to the Sun. This means it’s never 180° from the Sun. Moreover, it’s never more than about 47° from the Sun. That, by itself, is a first hint, but ...
Pierre Paquette's user avatar
5 votes
Accepted

When did Venus reach approximate radiation equilibrium?

If we assume that energy transport in atmospheres happens purely via radiation, then we can estimate a simple adjustment time to an exchange of exterior forcing factors (change in mean solar angle, ...
AtmosphericPrisonEscape's user avatar
5 votes
Accepted

Is Venus' magnetosphere actually more powerful than the solar wind's magnetic field that induced it or vice versa?

Is the Venus's magnetosphere actually more powerful than the solar wind's magnetic field that induced it or vice versa? I think you are asking whether the magnitude of the magnetic field is larger at ...
honeste_vivere's user avatar
4 votes

Why have some space exploration breakthroughs not been retried for the last 50 years?

The "why do we as mankind do..." type of questions are hard to answer as there is no single body who decides what "we" do, nor are there single reasons why a space mission is ...
planetmaker's user avatar
  • 19.5k
4 votes
Accepted

When did Venus get as hot as it is now?

According to current models and computer simulations, Venus was a water world many billion years ago but due to the close proximity to it's host star, Sun or Sol, the water was Photocatalytically ...
Arjun's user avatar
  • 1,464
4 votes

What is the ring of light around the moon and which star seen near it?

The ring you are referring to is called the Moon Ring. Although not clearly visible in your picture. Attached below is one I clicked on the night of 24th November 2023 from my phone. The ring appears ...
Disip Chaturvedi's user avatar
3 votes
Accepted

Does the reflected light from Earth boost Venus' apparent magnitude when it is seen transiting the Sun?

Let's collect some data: Earth has an absolute magnitude of -3.99 Venus has an absolute magnitude of -4.4 (Source Wikipedia Venus and Wikipedia Earth) Absolute magnitude equals the apparent ...
Ralf Kleberhoff's user avatar
3 votes

How close can Venus be to the sun in the sky and still be visible to the naked eye?

Around 15 degrees. Viewing Venus when it's near the Sun is difficult, for much the same reasons that it's difficult to view the Moon when it's a very thin crescent. You have to deal with the light of ...
PM 2Ring's user avatar
  • 14.8k
3 votes
Accepted

Is Venus in our sun's habitable zone?

Venus, currently is not in the habitable/Goldilocks zone. However once it had deep oceans of water, millions of years ago. based on computer modellings of the climate of the ancient Venus by ...
Arjun's user avatar
  • 1,464
3 votes

3rd brightest ever object in the sky

The brightest star-like object is probably Supernova SN 1006. With object before the time of modern photographic techniques, one is dependent on descriptions, and these can be hard to interpret when ...
James K's user avatar
  • 123k
2 votes

Is Venus' north towards Earth's south

I'm going to disagree with the other two answers in a particular way. There is a way to take the "roughness" out of this question, and make this question more precise and scientific, not ...
Lee Mosher's user avatar
2 votes

Is Venus' north towards Earth's south

This is a matter of convention and definition, not science (as @jamesk states). It depends what "north" means. Presumably, you are not asking about magnetic north. Generally, the celestial ...
fectin's user avatar
  • 129

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