The Latest “Cosmos” Episode Has the Best Argument Yet Against Creationism

Host Neil DeGrasse Tyson explains that Young Earth creationists would “extinguish the light from most of the galaxy.”

Neil Tyson approaches a black hole.Fox.

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To be a Young Earth creationist is to hold a truly unique place in the history of wrongness. These religious ideologues don’t just deny human evolution; their belief in a universe that is only a few thousand years old commits them to an enormity of other errors, including many beliefs that fly in the face of modern physics.

Last night’s episode of Cosmos, devoted to explaining the nature of space, time, and the speed of light, presented a stunning case in point. For as host Neil deGrasse Tyson explained, if creationists were right about the extreme youth of the universe, then we wouldn’t even be able to see the vast majority of the stars in the sky. The Hubble Space Telescope? Not a very worthwhile investment.

The logic is unavoidable: Light travels at a fixed speed of 186,000 miles per second. Because of this, many objects in the universe are many “light-years” away from us, where a light-year is simply the distance light travels in the space of the year. As an example, Tyson presented one particular object, the Crab Nebula, which just happens to be 6,500 light years from Earth. This means that when we look at it, what we’re actually seeing is the nebula as it was 6,500 years ago:

The Crab Nebula. NASA/Wikimedia Commons

The Crab Nebula is far away, but not that far: It is actually still part of our own Milky Way galaxy. But the fact that it happens to be 6,500 light-years off has a particular significance for creationists, as Tyson explained:

According to some beliefs, that [6,500 years] is the age of the whole universe. But if the universe were only 6,500 years old, how could we see the light from anything more distant than the Crab Nebula? We couldn’t. There wouldn’t have been enough time for the light to get to Earth from anywhere farther away than 6,500 light-years in any direction. That’s just enough time for light to travel through a tiny portion of our Milky Way galaxy.

To believe in a universe as young as 6 or 7,000 years old is to extinguish the light from most of the galaxy. Not to mention the light from all the hundred billion other galaxies in the observable universe.

And yet, of course, we can see these galaxies, this light. We can see all the way back to the very beginning of the universe, just after the Big Bang.

That is what you call a devastating, annihilating refutation. Creationists, in their small-mindedness, would literally take most of the universe away from us.

On a recent episode of the Inquiring Minds podcast, Tyson explained to us why he doesn’t debate such science deniers; you can listen here (interview starts around minute 13):

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SIX TRUTHS

Reclaiming power from those who abuse it often starts with telling the truth. And in "This Is How Authoritarians Get Defeated," MoJo's Monika Bauerlein unpacks six truths to remember during the homestretch of an election where democracy, truth, and decency are on the line.

Truth #1: The chaos is the point.

Truth #2: Team Reality is bigger than it seems.

Truth #3: Facebook owns this.

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Truth #5: It's about minority rule.

Truth #6: The only thing that can save us is…us.

Please take a moment to see how all these truths add up, because what happens in the weeks and months ahead will reverberate for at least a generation and we better be prepared.

And if you think journalism like Mother Jones'—that calls it like it is, that will never acquiesce to power, that looks where others don't—can help guide us through this historic, high-stakes moment, and you're able to right now, please help us reach our $350,000 goal by October 31 with a donation today. It's all hands on deck for democracy.

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