Why Do People Say the Moon is Made of Green Cheese?

Green Moon

As far as I know none of the Apollo missions included bringing a cheese grater…

So this isn’t about a scientific discovery by any means, but I did do a little bit of online research to discern the origin of the old expression that the Moon is “made of green cheese.” We’ve all heard it, and though I’m pretty sure that nobody has ever actually taken it as a fact (although when it concerns the Moon there never seems to be any shortage of crazy theories) I had to wonder just where it came from.

As it turns out, it’s the curiously uncanny remnant of a bit of snark that dates back to at least the 16th century — long before Apollo, spectroscopy, or even the first telescope.

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What Would it Take to Knock the Moon Out of Orbit?


Even an impact by an object the size of Ceres wouldn’t destroy the Moon (Image: NASA)

Whenever there’s news of an asteroid expected to pass closely by Earth (like this one did on Halloween 2015) at least one person will typically ask “what if it hit the Moon?” (as if that’s a scenario that somehow all of the astronomers around the world who specialize in near-Earth asteroids failed to take into consideration.) I assume the expected answer would be that such an impact would offset our Moon’s oh-so-delicate position in Earth orbit and send it tumbling inwards toward an inevitable and catastrophic collision with our planet, or possibly shatter it apart completely.

As it turns out the Moon is a lot tougher than many people think. (Maybe they’d just watched too many Saturday morning cartoons.)

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Pluto Is the New Science Star of the Solar System

This "psychedelic" picture of Pluto accentuates the subtlest color differences across its surface. (Credit: NASA/JHUAPL/SwRI)

This “psychedelic” picture of Pluto accentuates the subtlest color differences across its surface. (Credit: NASA/JHUAPL/SwRI)

Now over four months after the historic and long-awaited flyby of Pluto by New Horizons, planetary scientists have had a steady stream of unprecedented data arriving on Earth from the outwardly-speeding spacecraft. We’ve learned more about Pluto in the past few months than we had over the decades before and the information is still being analyzed — and is still coming. This surprising little world and its strange family of mismatched moons, 33 times farther from the Sun than us, has become in the latter half of 2015 the scientific “star of the Solar System.” (Take that all you can’t-be-a-planet folks!)

“It’s hard to imagine how rapidly our view of Pluto and its moons are evolving as new data stream in each week. As the discoveries pour in from those data, Pluto is becoming a star of the Solar System. Moreover, I’d wager that for most planetary scientists, any one or two of our latest major findings on one world would be considered astounding. To have them all is simply incredible.”
– Dr. Alan Stern, New Horizons Principal Investigator, SwRI

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Mars is Tearing its Moon Apart


Long grooves on Phobos are likely stress fractures caused by tidal forces. This image was acquired by HiRISE on March 23, 2008. (NASA/JPL-Caltech/University of Arizona)

Phobos, the largest — yet at just 16 miles wide still quite tiny — moon of Mars is getting ripped apart by the gravitational pull of its parent planet… and it bears the scars to show it, scientists have determined.

Long parallel grooves that wrap around the surface of Phobos are thought to be stress fractures — surface evidence of the tidal forces that will one day cause the moon to break apart entirely. This fate is not surprising to scientists, but that we’re seeing it in action is fascinating.

“We think that Phobos has already started to fail, and the first sign of this failure is the production of these grooves,” said Terry Hurford of NASA’s Goddard Space Flight Center in Greenbelt, Maryland.

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Soar Over the Surface of Tethys with Cassini

Animation of Tethys' surface made from raw Cassini images acquired Nov. 11, 2015. (NASA/JPL-Caltech/SSI. Animation by J. Major.)

Animation of Tethys’ surface made from raw Cassini images acquired Nov. 11, 2015. (NASA/JPL-Caltech/SSI. Animation by J. Major.)

On Nov. 11, 2015, NASA’s Cassini spacecraft passed relatively closely by Saturn’s moon Tethys, one of the ringed planet’s larger icy satellites. The animation above was made from 29 raw images acquired with Cassini’s narrow-angle camera as it passed by; you can see part of the incredibly cratered and ancient surface of this 662 mile (1,065 km) wide moon. Talk about flyover country!

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NASA Hits Halloween Asteroid With Radar

Radar-generated images of the near-Earth object 2015 TB145 made on Oct. 31, 2015 from 5:55 a.m. PDT (8:55 a.m. EDT) to 6:08 a.m. PDT (9:08 a.m. EDT). (NASA/JPL-CALTECH/GSSR/NRAO/AUI/NSF)

Radar-generated images of the near-Earth object 2015 TB145 made on Oct. 31, 2015 from 8:55 a.m. EDT 9:08 a.m. EDT. (NASA/JPL-CALTECH/GSSR/NRAO/AUI/NSF)

On the afternoon of Oct. 31, 2015, Earth was visited by something much creepier than the typical Halloween trick-or-treater: a dark 2,000-foot (600-meter) -wide asteroid that sped silently (because space) by, approaching at its closest only about 1.3 times the distance to the Moon.

Designated 2015 TB145, this particular near-Earth object had only just been discovered a couple of weeks earlier. And while it posed no danger of impact, its considerable size and high velocity made the close pass a topic of interest for laypeople and scientists alike. By bouncing radar waves off its surface NASA researchers were able to generate an image of 2015 TB145, capturing details that would have been otherwise impossible due to its high velocity and incredibly dark coloration.

Read my full story on Discovery News here.


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