Are we in the Mare Imbrium?

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No - I think the peculiarities of illumination will help narrow down the possibilities considerably.

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Zucchius, Bettinus, Kircher, Wilson

The line at the back is Bailly.

I believe that the craters have lava floors from Mare Orientale

Slam dunk, ozark1!
With special I was referring to the fact that they present the sequence of crater degradation almost perfectly, and in the right order, too; but of course what you mentioned makes them special as well.

The magnificent photo (by Paolo R. Lazarotti) and the idea for the question were plucked from the April 1, 2006 LPOD. I rotated the image 90° so the proximity to one of the poles (as the lighting gives away) wouldn't be too obvious.

On to you!

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The Centaur's knee's gone blue, but she says it's yellow!

(Very easy)

The first half is very easy (Beta Centauri = Agena = the knee, which is blue), but I have no idea who she is.

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Maybe, but there again maybe not...

Alpha Sagittarii also fits that description although a dwarf.

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"I will do my best to understand and explain the universe from big to small without invoking miracles, unrepeatable events, or divine intervention. In place of those things I will use observations, mathematics, and science."


-Cross
My travel blog

Some of my Astrophotography


Those that lack education have a hard time understanding its value. - Cross

Aha! Anne McCaffrey calls Alpha Sagittarii a yellow star in her Dragonriders novels.

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Yes indeed.

Yours I think

With a little help from crosscountry...

What are the Global Mean Surface Temperatures of Mercury, Venus, Earth, the Moon and Mars?

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Well, if the German Wikipedia edition can be trusted, they are
440, 737, 288, 218 and 210 K, respectively.

Goes to show what greenhouse effects can do for (or to) you.

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Translating into degrees Celsius:

Mercury = 167 C (my source gave "about 170 C")

Venus = 464 C (my source gave "about 460 C")

Earth = 15 C

Moon = -55 C (my source gives +1 C!)

Mars = -63 C (my source gives -60 C)

The only real anomaly is the Moon. I have heard that without the greenhouse effect the Earth's GMST would be about -20 C. As the Earth has a much greater albedo than the Moon, I would expect the Moon's GMST to be somewhat higher than -20 C. My source, The Open University, gave a figure of +1 C, which is much hotter than Wikipedia's -55 C.


(Your turn anyway, Arneb; but it would be nice to clear up this anomaly.)

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That is funny. The German Wikipedia article goes on to tell us that temperatures vary between +130 and -160 °C. that would put the mean temperature at about -15 °C. I also heard the story of Earth's greenhouse effect adding about 18 °C to what we would have if sunlight alone were responsible. That would put the temp. at about -3 °C. A typo? On the other hand, it could also mean an artifact of temperature calculation: the global mean temperature on a slowly spinning airless body is is not a very realistiv value, is it? The actual temperature would be near the extremes at any given point in time, as the Moon cools and heats quite rapidly. That might make the "mean" temperature quite sensitive to details of the calculation process. And didn't the moon hoax believers tell us convoncingly that anything on the Lunar surface is either sizzling hot or deep freeze cold? Instantaneously? Well, there you have it...

Edit: The NASA factsheet, citing yet another value (-20 °C), also stresses that mean global surface temperature is unrealistic because of the temperature extremes which occupy most time in a given nightday cyle.

Let me see aobut the next question. I bought my next month's ration of astronomy magazines today, so I'll think of something.

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Hmmm short of ideas after a bad week at the hospital. So, just a quick throw-in to get the game going again.

One major Lunar crater is - probably wrongly - reputed to have been forme in historical times.

Which, when, and what's the story?

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Hint,

It's a few pages back....

Off the top of my head, Giordano Bruno?

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Of course. All yours, Eroica, but could you tell the story?...

Dorry for the repetition, ozark; I think that was uring a phase when I wasn't participating too actively.

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Korycansky, Laughlin and Adams suggests about 3.5 billion years with the Sun about 40% brighter than now.

However at 15% brighter, the global mean temperature would be 60 C - already causing havoc. This is forecast for 1.2 billion years in the future.