Mar 142018

Stephen Hawking died earlier today.

Hawking was diagnosed with ALS in the year I was born, in 1963.

Defying his doctor’s predictions, he refused to die after a few years. Instead, he carried on for another astonishing 55 years, living a full life.

Public perception notwithstanding, he might not have been the greatest living physicist, but he was certainly a great physicist. The fact that he was able to accomplish so much despite his debilitating illness made him an extraordinary human being, a true inspiration.

Here is a short segment, courtesy of CTV Kitchener, filmed earlier today at the Perimeter Institute. My friend and colleague John Moffat, who met Hawking many times, is among those being interviewed:

 Posted by at 9:17 pm
Mar 112018

Very well, having grown up in a police state of sorts myself, I know I should not take these things lightly. There are plenty of political prisoners in China, and now that Xi declared himself president for life, I expect things to get worse, not better.

Still… I could not help myself, I was laughing out loud as I read the story of an elderly Chinese woman who took revenge of a fortune teller because contrary to his predictions, she did live to see 2018 after all.

According to the South China Morning Post, Mrs. Wang ran into the fortune teller in a park and in her anger, she started vandalizing his stall. But then, “[a] police officer intervened and asked the fortune-teller to apologise to Wang for causing mental suffering.”

Thank you, Mr. anonymous Chinese police officer, for doing exactly what a sensible person should have done. Good to know that common sense is still alive and well in some parts of the world.

 Posted by at 5:33 pm
Mar 102018

There is a very interesting concept in the works at NASA, to which I had a chance to contribute a bit: the Solar Gravitational Telescope.

The idea, explained in this brand new NASA video, is to use the bending of light by the Sun to form an image of distant objects.

The resolving power of such a telescope would be phenomenal. In principle, it is possible to use it to form a megapixel-resolution image of an exoplanet as far as 100 light years from the Earth.

The technical difficulties are, however, challenging. For starters, a probe would need to be placed at least 550 astronomical units (about four times the distance to Voyager 1) from the Sun, precisely located to be on the opposite side of the Sun relative to the exoplanet. The probe would then have to mimic the combined motion of our Sun (dragged about by the gravitational pull of planets in the solar system) and the exoplanet (orbiting its own sun). Light from the Sun will need to be carefully blocked to ensure that we capture light from the exoplanet with as little noise as possible. And each time the probe takes a picture of the ring of light (the Einstein ring) around the Sun, it will be the combined light of many adjacent pixels on the exoplanet. The probe will have traverse a region that is roughly a kilometer across, taking pictures one pixel at a time, which will need to be deconvoluted. The fact that the exoplanet itself is not constant in appearance (it will go through phases of illumination, it may have changing cloud cover, perhaps even changes in vegetation) further complicates matters. Still… it can be done, and it can be accomplished using technology we already have.

By its very nature, it would be a very long duration mission. If such a probe was launched today, it would take 25-30 years for it to reach the place where light rays passing on both sides of the Sun first meet and thus the focal line begins. It will probably take another few years to collect enough data for successful deconvolution and image reconstruction. Where will I be 30-35 years from now? An old man (or a dead man). And of course no probe will be launched today; even under optimal circumstances, I’d say we’re at least a decade away from launch. In other words, I have no chance of seeing that high-resolution exoplanet image unless I live to see (at least) my 100th birthday.

Still, it is fun to dream, and fun to participate in such things. Though now I better pay attention to other things as well, including things that, well, help my bank account, because this sure as heck doesn’t.

 Posted by at 12:59 pm
Mar 052018

Saturday evening, the President of the United States, Donald J. Trump talked to some Republicans behind closed doors. But a recording has been leaked.

Here is what Mr. Trump said, among other things, in response to Xi Jinping turning China back to strongman rule by removing term limits from China’s constitution: “He’s now president for life. President for life. No, he’s great,” Trump said. “And look, he was able to do that. I think it’s great. Maybe we’ll have to give that a shot some day.

Having read, and then heard, these words, I was filled with a combination of dread, disgust, despair and revulsion.

Fuck you, Trump. Fuck you, Republican cheerleaders who sacrifice everything sacred for party loyalty and for power.

Forgive my vulgar outburst but this crossed a line. This REALLY crossed a line. I grew up in a communist state, not on a freaking golf course courtesy of rich daddy, like this megalomaniac asshole who has no idea what he is idiotically blabbering about, cheering on a commie dictator because apparently he, too, would love to be president for life.

I think that with this statement, Trump abdicated the informal position of “leader of the free world”. A true leader of the free world would never cheer on a commie dictator, not even as a tasteless joke. He may be America’s President, but with these words, he has declared himself an enemy of the world that I call free.

 Posted by at 12:47 am
Mar 022018

To my American friends who believe Trump is doing a good job protecting the US economy: I think it is telling that US stock markets are hurting more today than their Canadian counterparts, despite the fact that Canada is the primary target of Trump’s proposed steel and aluminum tariffs:

What can I say. Be careful what you wish for. And we have not even discussed how Canada (or Europe) might retaliate. But in the end, we will all be losers, no matter what the narcissistic idiot in the White House thinks about the wonderful job that he is doing.

 Posted by at 12:05 pm
Mar 012018

I am playing with JavaScript and HTML5. Three-dimensional transformations.

Cable News Network

It's more fun than I thought. And gives a whole new meaning to the word, "spin", as I am listening to CNN.

 Posted by at 9:20 pm
Mar 012018

No, it isn’t Friday yet.

But it seems that someone at CTV Morning Live wishes it was. Why else would they have told us that yesterday, February 28, was a Thursday? (Either that or they are time travelers from 2019.)

Then again, maybe I should focus on what they are actually saying, not on a trivial mistake they made: that even as parts of Europe that rarely see snow are blanketed by the white stuff, places in Canada and Siberia see unprecedented mild weather. A fluke or further evidence of climate change disrupting the polar vortex?

 Posted by at 8:13 am