Showing posts with label astronomy. Show all posts
Showing posts with label astronomy. Show all posts

Tuesday, October 15, 2013

"I'm interested in the fakeness of all those colorful photographs of the universe that we've been looking at all these years."

I said, in the course of contemplating what Maureen Dowd said about Robert Redford's hair and after reading that "There are no 'natural color' cameras aboard the Hubble and never have been. The optical cameras on board have all been digital CCD cameras, which take images as grayscale pixels." I also tweaked "the atheist Christopher Hitchens" for "burbling about 'the color and depth and majesty' of the Hubble photographs as he urges us to see the revelations of science as more awe-inspiring than the old stories told by religions." I exclaimed: "But the color is fake! The purveyors of science, like religionists, can scam us too."

Reader Gabriel Hanna emails:
To say that something is a scam [is] to say it is dishonest and done for financial gain.  
Now, technically, I did not say the color in the Hubble photographs is a scam. I said it was fake, and then, in a separate sentence, I stated a generality — "The purveyors of science, like religionists, can scam us too" — which is my standard warning to pay attention and be skeptical.
Astronomers, it is true, are largely taxpayer-supported, they are using the Hubble images to convince people to pay for astronomy. But the other element of a scam is dishonesty, and I do not agree that the Hubble images are dishonest — or if they are, they are no more dishonest than any photography.

Light is inherently greyscale, there is no color in it.  Light has only frequency.  Human eyes are sensitive to three sets of frequencies, and the human brain interprets these as color.  All cameras have to "fake" color in the sense that you accuse Hubble astronomers of faking color, because a machine cannot record a subjective human experience.

Hubble, like any digital camera, records numbers that correspond to frequencies of light.  The colors are put into the images by the algorithm that converts the numbers to an image.  In a film camera the data is collected and stored chemically and the developing process does what software does for digital cameras.

When a photographer adjusts white balance, or shoots in sepia, that is "false color" in the exact sense it is for Hubble images.  We do not call that dishonest in the case of digital photography, and it is not a scam even if the photographer sells the photographs.  Like digital photography, most Hubble images are boring, and for public consumption astronomers select the beautiful ones in the same way that a blogger takes hundreds of shots before she gets one good enough to post. Like digital photography, brightness and white balance of Hubble images might well be adjusted, or colors altered in the same way as shooting in sepia, but if we don't call it a scam in the one case we ought not to call it one in the other.

It is especially unfair in that Hubble extends human capabilities to non-visible wavelengths.  It seems very unfair to say that honesty demands that all radio or x-ray astronomy images be rendered in flat black because humans cannot see those colors, and to do anything else is a "scam."
But I stand by my warning. The scientists do want our money, as Hanna concedes. And people like Hitchens call us to replace religion with science because science is so beautiful. If scientists, seeking dominance, punch up the beauty of their images, we must take that into account as we analyze arguments and implicit pleas for money that are based on the beauty of what they are showing us. The art photographer — processing the camera's digital file — is forthrightly guided by aesthetics. The Hubble images can be presented as artwork manipulated for aesthetic pleasure, but to the extent that they are not — as in Hitchens's argument — it is rational and scientific to catch a whiff of scam.

Saturday, October 12, 2013

"And Mr. Chandor can verify to skeptics Mr. Redford’s claim that his hair remains naturally Hubbell strawberry blond."

"His locks survived the months of sun and chlorine, with no colorist in sight," writes Maureen Dowd in that NYT article that we're already talking about in that first post of the day.
“No one believes me,” Mr. Redford said. “Even my kids didn’t believe me. I keep thinking of Reagan. It’s freaking me out.”
Chandor is J. C. Chandor, the director of Redford's new movie, "All Is Lost," which is a seafaring tale, hence the "sun and chlorine."

Dowd doesn't say whether she believes him, but she quotes "No one believes me" without stating her view. She has the mysterious line "Mr. Chandor can verify," but did she ask Mr. Chandor, and who can believe that Mr. Chandor watched Mr. Redford at all times? Who thinks Ronald Reagan didn't dye his hair? But it's nice of Robert Redford to keep thinking about Ronald Reagan. These slow-aging Hollywood RRs need to stick together with their age-defying secrets.

What does Hubbell refer to in "naturally Hubbell strawberry blond"? The Hubbell telescope? "There are no 'natural color' cameras aboard the Hubble and never have been. The optical cameras on board have all been digital CCD cameras, which take images as grayscale pixels." It's Hubble, not Hubbell, so it can't be that — though I'm interested in the fakeness of all those colorful photographs of the universe that we've been looking at all these years.

Here's the atheist Christopher Hitchens burbling about "the color and depth and majesty" of the Hubble photographs as he urges us to see the revelations of science as more awe-inspiring than the old stories told by religions:



But the color is fake! The purveyors of science, like religionists, can scam us too.

Now, back to the possible scam of the color of Robert Redford's hair. And I got a sudden inspiration about the meaning of Hubbell. Some character Redford played long ago? I go to his IMDB page and search. Ah! It's the name of the guy he played in "The Way We Were." Am I ashamed not to have known? Absolutely not! I'm damned proud I never saw that movie. It was back in 1973 too, when we went to see every movie we thought was supposed to be good. We knew better.

In the comments at that first post of the day, Amexpat calls bullshit on Redford:
He hasn't aged honestly or gracefully (Paul Newman did a better job at that). His hair looks ridiculous for a man his age.
I note that he claims it's all natural, and the lovely redhead Maureen Dowd backs him up at least insofar as no one on set saw a hairdresser. I offer a poem parody (original here):
Who has seen the hairdresser
Neither you nor I
But when the 77-year-old has yellow hair
The hairdresser has passed by
One of the stated themes of that post is "Where's God?" (which came up in the context of Redford's sidekick Nick Nolte, who asked the question in the context of saying you'll kill yourself trying to answer it). So I say:
Where's God?

With the hairdresser.
But that's a joke, everyone knows that like Nick Nolte, God has gray hair:



What if God were one of us? He might go grocery shopping with Nick Nolte:



But go ahead, if you're the creative type — you don't have to be as creative as The Creator (He's so creative!) —  to take that iconic Michelangelo image of God and photoshop us a post-hairdresser pic, with God's flowing tresses rejuvenated into Hubbell strawberry blond.

Here:



You could change Adam into Robert Redford. Did you know that in the movie "All Is Lost," Robert Redford's character is called only "Our Man" and that in the Bible, Adam means "man"? Anyway, the scenario here in this imagined photoshop is God and The Man at The Hairdresser. They look about ready to consult The Manicurist. While we're punching up awe-inspiring images with color, it's probably time to repaint God's pink dress. Maybe something effulgently red, gold, and green, like the colors with which a science huckster would infuse the Hubble's pixels.

Thursday, September 12, 2013

Voyager 1 becomes the first man-made object to enter interstellar space.

The trip took 36 years.
The lonely probe, which is 11.7 billion miles from Earth and hurtling away at 38,000 miles per hour, has long been on the verge of bursting through the heliosphere, a vast, bullet-shaped bubble of particles blown out by the sun. Scientists have spent this year debating whether it had done so, interpreting the data Voyager sent back in different ways.
It hasn't sent back any pictures since 1990.

Wednesday, June 12, 2013

"Tycho Brahe Died from Pee, Not Poison."

News from the 16th century. I know the linked story was published last November, and I'm sorry I didn't get it out more quickly, which is perhaps something Tycho Brahe might have said (in Polish).
Brahe was long thought to have died from a bladder infection after politeness kept him from excusing himself to use the bathroom during a royal banquet in October 1601, causing his bladder to rupture. However, scientists who opened Brahe's grave in 1901 to mark the 300th anniversary of his death claimed to find mercury in his remains, fueling rumors that the astronomer was poisoned. Some even accused [his not-yet-famous assistant Johannes] Kepler of the crime.

But the new results don't point to any such intrigue. While analyses of Brahe's teeth are not yet complete, tests on his bones and beard hairs show that mercury concentrations in his body were not high enough to have killed him....
Also discovered: Brahe's fake nose was probably made of brass, not silver.

Anyway, it was Kepler who gave the original the first-hand account of this story:
... Tycho had refused to leave the banquet to relieve himself because it would have been a breach of etiquette. After he had returned home he was no longer able to urinate, except eventually in very small quantities and with excruciating pain.... Before dying, he urged Kepler to finish the Rudolphine Tables and expressed the hope that he would do so by adopting Tycho's own planetary system, rather than that of Copernicus. It was reported that Brahe himself had written his own epitaph, stating "He lived like a sage and died like a fool."
I arrived at this story today because I was worried about people who might think too much about Rand Paul and take Gabriel Gomez's boast too seriously. 

Friday, February 8, 2013

In one week, "an office-building-size asteroid will speed past Earth faster than a bullet and closer than some communications satellites."

"The good news: There’s no chance of an impact. At its closest, asteroid 2012 DA14 will pass about 17,000 miles above Earth."

Wow. I had no idea communications satellites were that far away!

But anyway, an office building, eh? Which office building? Are we talking Pentagon-size? The Pentagon, you know, is the world's largest office building. Obviously, this asteroid isn't Pentagon-sized or the WaPo would have said an asteroid the size of the Pentagon, which would have sounded much more amusing (and scary) than "office-building-size asteroid," which leads me to picture an ordinary place downtown in my own city.

So, I'm picturing it, this office-building-size asteroid. What happens if it hits?
Meteor Crater in Arizona — nearly a mile wide — was... probably gouged by an office-building-size space rock about 50,000 years ago.
How big must we go before we're talking wiping-out-the-dinosaurs apocalypse? Apparently, that would be about 5 miles wide. And, no, the Pentagon is not 5 miles wide. It's 921 feet along each outer side facade.

ADDED: A reader writes:
While the physics that I do for a living doesn't have a whole lot to do with planets or asteroids, I do enjoy the stuff and am fairly well versed in it. Since you were wondering on the blog today what a 150 foot asteroid would do, it's about half the length of the asteroid that did the Tunguska event. Remember that mass goes more or less like length-cubed, so the 150 foot asteroid would be about 1/8th the weight/power.

Tunguska had the power of 1000 Hiroshima bombs. So 1/8th of that still would more or less destroy a city if it landed on it. Most likely, of course, any asteroid would hit the ocean. But that would still cause a massive tsunami like we haven't seen in recorded history.

I don't know if you've heard of the Apophis asteroid, but it's more than 3x the length of the Tunguska asteroid and it's going to come very close to Earth in 2029, and then again in 2036 (though it will not hit either year, it's still been mixed in with a lot of silly 2012-style apocalypse myths). Scientists have already accomplished the task of landing a spacecraft on another asteroid, so there is a lot of talk of attaching a beacon to Apophis in 2029 so we could follow it on its path. Would be really fascinating science.