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SYFY WIRE Bad Astronomy

No, You Won’t Be Able to Float on Zero G Day

By Phil Plait

Hurray! My first debunking of 2014!

I mean, âSigh. Do I have to do this already?â

Yes. Yes, I do.

Let me start off this way: Youâll never hear me say, âWell, now Iâve heard it all.â Long experience has taught me there is always a sillier claim. Always. And youâre hearing that from a guy who has debunked the ideas that the Maya calendar predicted the end of the world, that the âSupermoonâ caused earthquakes, and that NASA found plastic beads (and a Wookiee) on Mars.

So whatâs sillier than these? Well, we now have the claim that on Jan. 4, 2014âtomorrowâdue to the combined gravity of Jupiter and Pluto, you will be able to jump in the air and float for just a couple of seconds.

Itâs hard for me to overstate just how wrong this claim is. After all, the physics is wrong, the claim about Pluto and Jupiter is wrong, and itâs based on a joke made by an astronomer nearly 40 years ago!

Despite this, itâs being presented as fact by a website called News Hound (and various other sources), and itâs spreading around Facebook (and Twitter) so much that I got several emails and tweets about it.

I know, I know. Still, itâs popular enough I figure Iâd better take a stab at it. So to get started, hereâs the claim:

It has been revealed by the British astronomer Patrick Moore that, on the morning of January 4th 2014, an extraordinary astronomical event will occur. At exactly 9:47 am, the planet Pluto will pass directly behind Jupiter, in relation to the Earth. This rare alignment will mean that the combined gravitational force of the two planets would exert a stronger tidal pull, temporarily counteracting the Earthâs own gravity and making people weigh less. Moore calls this the Jovian-Plutonian Gravitational Effect.

Yeah, except this is all baloney. To be polite. OK, so why is this wrong?

Pluto and Jupiter, Sitting in a Tree â¦

First of all, the gravitational forces of the other planets in the solar system have essentially zero effect on you personally. And weâre done. Full stop.

OK, fine, Iâll give some brief details. The planets are big objects with lots of gravity, but that only affects you if youâre close to them. Space, however, is bigâthatâs why we call it spaceâand planets are far away. This weakens their gravity on you hugely, reducing it to less than the impact of the flutter of a butterflyâs wing.

If you want the math, then here you go: Even if you add all of the planets together, they pull on you with a force less than 2 percent of that of the Moon! The News Hound article mentions tides, too, but thatâs even worse: The combined tidal force from the planets is far less, like 0.005 percent of the Moonâs! Simply put, the planets are just too far away to have any real effect on you. By the way, the Moon orbits the Earth on an ellipse, so its own gravity fluctuates far more than the combined strength of the planets every two weeks.

Note that you cannot float in the air every two weeks.

And specifically, the gravity from Pluto is weakest of them all. Pluto is a teeny tiny iceball, far smaller than even our Moon ⦠and at its closest itâs flippinâ 4 billion kilometers (2.5 billion miles) from Earth. Thatâs a long way. A car on the road half a kilometer away has more gravitational pull on you than Pluto does.

In fact, doing the math, I find that the Earth pulls on you about 200 trillion times harder than Pluto does. That's about the same ratio as the number of cells in your body to a single cell ... so this claim that you can float is like saying you can shed a single cell and fly away by flapping your arms.


It gets worse (amazingly). The article says Pluto will be âdirectly behind Jupiterâ on Jan. 4. I checked: On that day they are on opposite sides of the sky. I mean, almost exactly opposite, nearly 180 degrees apart. You couldnât have picked a much worse date to claim Pluto was behind Jupiter.

So the physics of the claim is ridiculous. But the origin of the claims makes it even funnier.

Fool Me Once, Shame on You

The article on News Hound mentions that this claim came from Patrick Moore. He was a real man, an astronomer in the U.K. who was enormously popular due to his radio and television programs about scienceâhe predated Carl Sagan and is still considered an icon of science in England.

The wonderful thing about all this is: Moore actually did make this claim! However, as points out, it was an April Fools' Day joke. Moore made this claim in 1976 on his radio program. To my complete unsurprise, apparently some folks called in to say they did feel the effect! This is called âpriming,â where you tell people in advance that theyâll feel something due to some cause, and they will, even if the cause never happened. Itâs used by ghost hunters and ghost tour guides quite a bit, to spook people before they actually enter a âhaunted house,â guaranteeing theyâll feel chills as they walk from room to room. Iâve seen this myself first hand: People can convince themselves of amazing things that never actually happened.

Hope Floats

So there you go: Itâs a silly claim based on a joke in the first place.

I know a lot of people reading this right now are slapping their foreheads and wondering how people can be so stupid as to fall for this. I understand this reaction, but I donât share it. Smart people fall for silly things all the time, and intelligence isnât really the prime factor here.

Skepticism is. In general, schools donât teach people how to analyze a claim, how to tell if something makes sense on the surface of it, or how to go about looking into the claim. I knew right away to do the math, and to see if Pluto and Jupiter really were aligned as the article says. But all too often, people donât think carefully (or at all) about these claims, and simply spread them through social media. All it takes is literally the click of a âShareâ button. Pseudoscience thrives via this virulence, whereas truth must take a harder path.

In fact, thatâs why I bother debunking stuff like this. Sure, this is a silly claim, and probably harmless in practice. But not all of them are; I already mentioned the âMayan Notpocalypseâ from 2012, and I can tick off a dozen other doomsday or scary claims that spread due to a lack of skepticism. And of course there are real issues like global warming denial, anti-vaccination, and more, which live and breathe and spread due to a lack of skepticism in the public.

This particular bit of fluff will dry up and float away in a day or two, but those others are here to stay for a long time. My hope is that every time we take a moment to inject a bit of (polite) skepticism into peopleâs everyday lives, it makes the world a slightly better place to be.

If enough of us do it often enough, we can change âslightlyâ to âmagnificently.â

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