Tag: magnetism

Rain on the Sun

By Phil Plait | April 19, 2012 12:16 pm

After I posted the video of the solar eruption earlier this week, I got a lot of questions about why material fell back from the explosion onto the Sun. The quick answer: gravity! A lot of the material from a prominence like that falls back onto the Sun because of the Sun’s strong gravity. Since the material is an ionized plasma – a gas stripped of one or more electrons — it follows the magnetic field lines of the Sun, so you can see graceful arcs of this stuff falling back down after the blast (see Related Posts below for links to more detailed descriptions of this phenomenon).

Oh, why describe it when I can show you? This video is from the NASA/JAXA Hinode spacecraft which observes X-rays from the Sun. It caught the event in loving detail:

See? Gravity does the work, but magnetism does the steering.

Tip o’ the phased plasma rifle in the 40 Watt range to Camilla Corona SDO.


Related Posts:

GORGEOUS solar eruption!
Desktop Project Part 8: From filament to prominence
The Sun decided to blow off a little steam today. Twice.
Gorgeous flowing plasma fountain erupts from the Sun
A fiery angel erupts from the Sun

CATEGORIZED UNDER: Astronomy, Cool stuff, Pretty pictures

Creepy bubbles and magnets

By Phil Plait | August 30, 2011 12:59 pm

Science videos are pretty cool, so I was excited to see this cool one using soap bubbles to show how a fluid infused with a magnetic material would flow through the bubbles interstices…

… until I watched to the very end and then decided this was actually some weird horror movie trailer. Still, way cool, and the editing was very good.

But man, those last few seconds are creepy. Funny how we anthropomorphize things, or at least mentally give them a vitality they really lack.

Still. Yeesh.

Tip o’ the bubble wand to io9.


Related posts:

This video illusion will destroy your brain
Swingin’ physics
This illusion will drive you mad

CATEGORIZED UNDER: Cool stuff, Humor, Science
MORE ABOUT: bubbles, magnetism

I have arrived as a skeptic

By Phil Plait | January 8, 2010 9:30 am

I’ve been a skeptic a long time, maybe 25 years or more now. It didn’t happen all at once, though there have been sudden world-shift moments for me. I’ve been an active skeptic — outspoken, that is, willing to talk about this stuff — for about 10 years now.

But now, finally, I feel that I have arrived at the Holy Grail of skepticism: a goofball antiscience promoter has quote mined me.

Quote mining is a tradition among the antireality crowd: they find something a scientist has said, and then leave out certain words, or edit out the context, making it look like the quote is the opposite of what the actual intention was. Creationists are notorious for this, but others do it as well.

On a bulletin board site called Christian Forums, there is a user who goes by the name "Agonaces of Susa", and this person has the usual antiscience CV stocked with creationism and such, but also, apparently, is a supporter of Velikovsky’s ridiculous and long-ago-debunked claims about astronomy.

For those of you who are happily unaware, Immanuel Velikovsky wrote a series of books decades ago saying that the events in the Bible were literally true, and caused by various astronomical things like planets careening around the solar system like billiard balls, interacting in impossible ways, and doing many impossible things. He’d have been better off just saying those were all miracles of God, but still, a lot of people swallowed his nonsense whole. It’s mostly dead now, with just a few reality-denying holdouts. I wrote a chapter in my first book, Bad Astronomy, dealing with the Velikovsky affair.

In this post on the forums, AoS says this little gem:

You trust the pseudoscientist Phil Plait that, these are his words, “Magnetism is…a joke in astronomy”?

Wow! That makes it seem like astronomers are idiots, doesn’t it? As if we don’t believe in magnetism at all, and that we think it has no role in astrophysics. But wait! Look at what he wrote. It has the magic wand of quote mining pseudoscience: the ellipsis! That means he left something out of what I said. And so what was it he left out?

Magnetism is a very important topic in astrophysics (despite some pseudoscientists lying and saying this force is ignored), but it’s not well-understood. It’s fiendishly complex, so much so that it’s a joke in astronomy: when giving a colloquium about an astronomical object’s weird features, saying it’s due to magnetism will always get a chuckle out of an audience. And it’s a standard joke that if you want to derail a talk, ask the speaker about the effects of magnetism. In three dimensions, magnetism is ferociously difficult to model.

I bolded the part that was quote mined, and as you can see, AoS completely took out of context what I was saying. He also misinterprets what I said about Velikovsky. While I did say that Velikovsky was wrong about everything, I meant that he was wrong about his science. Sure, he said Venus would be hot, but the reason he said it would be hot was completely wrong (Velikovsky claimed it was ejected whole from Jupiter, which is about the wrongest wrong you can ever wrongly wrongify). Even if you drop a shotgun you might have one pellet hit the target, but that ain’t skill.

That thread on the forum goes on and on, and AoS is joined by others who appear to willfully misunderstand what I’m saying, or at least pick and choose from what I’ve said to make it look like I’m wrong. That might work for the flock (or the Simpsons), but the rest of the world sees right through them.

But will these people listen? Of course not! Because this is their arguing tactic:

lalalala_beavercanthearyou

Still, it’s an honor to have been quote mined. Thank you, gentlemen, for reminding me just why I fight this fight every single day.

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