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What Sci-Fi Gets Wrong About Lasers

2026-04-30 Science & Technology
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Description

Why does the light of a searchlight seem to stop? Neil deGrasse Tyson and Chuck Nice break down how sci-fi gets lasers wrong, the “Butter Gun Experiment,” and the inverse square law of light. Timestamps: 00:00 - Searchlights 00:52 - Where Does the Light Stop? 02:48 - Why Can You See the Light in the First Place? 04:45 - Inverse Square Law of Light 07:17 - Looking at a Column form the Side 09:23 - A Message About Aliens Check out our second channel, @StarTalkPlus Get the NEW StarTalk book, 'To Infinity and Beyond: A Journey of Cosmic Discovery' on Amazon: https://amzn.to/3PL0NFn Support us on Patreon: https://www.patreon.com/startalkradio FOLLOW or SUBSCRIBE to StarTalk: Twitter: http://twitter.com/startalkradio Facebook: https://www.facebook.com/StarTalk Instagram: https://www.instagram.com/startalk About StarTalk: Science meets pop culture on StarTalk! Astrophysicist & Hayden Planetarium director Neil deGrasse Tyson, his comic co-hosts, guest celebrities & scientists discuss astronomy, physics, and everything else about life in the universe. Keep Looking Up! #StarTalk #NeildeGrasseTyson

Top Comments (10)

@StarTalk 2026-04-30

How many of you knew the inverse square law of light?

97 50 replies
@bipolarminddroppings 2026-04-30

To be nerdy: Phasers aren't lasers, they are a confined particle stream of something called nadion particles, which emit light when they're excited and thats why you can see the beam. Disruptors are similar except they use a different particle. In Star Trek they very explicitly use "Particle weapons" and not lasers.

57 7 replies
@iamayanalii 2026-04-30

Please upload more of these explainers, consistently Dr.Tyson you're literally the GOAT.

53 1 replies
@JaydenSparks 2026-04-30

The animation of chuck looking into the light is perfect. More random animations in videos!

20
@Chilotakulive 2026-04-30

Love these type of facts ❤

15
@ccj2 2026-04-30

As a filmmaker this is one of the first StarTalks I’ve watched where I already knew the physics! The light beam part is a technique that’s used in film all the time. We actually spray haze all over the set and then thin it out so that you can actually see the light beams. So any movie you’ve even see in with light beams or laser beams like that (Steven Spielberg does this a ton), that’s because they sprayed a bunch of haze before they started filming.

8 1 replies
@Mr.Daytime 2026-04-30

Happy to see you

6
@B-Nice 2026-05-01

for a 10 minute video, a whole lotta work sure was put into this!! 🙏

2
@Zaphorex 2026-04-30

Your patience as a physicist, more so as a man, is impressive. Don't ever give up the work as an educator. The world needs it

1
@ericsyoutube 2026-05-01

When it’s Neil and Chuck, I can’t miss an episode.

1

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