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Is energy always conserved?

When light passes through the universe and is redshifted by the expansion of space itself, how is energy conserved? The stretched light has a longer wavelength and therefore a lower energy. Is energy conserved? If so, where does it go?
Season 1 Episode 19 Length 05:16 Premiere: 03/15/16

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Season 1 Episodes

Calculating Pi with Darts
S1 E925 Length 05:47 Premiere Date 06/12/16

Does height matter in sports?
S1 E32 Length 06:35 Premiere Date 08/10/16

What are antibubbles?
S1 E31 Length 06:11 Premiere Date 08/02/16

Can you solve this pier puzzle?
S1 E30 Length 04:58 Premiere Date 07/19/16

How to shrink a quarter with electricity
S1 E29 Length 07:48 Premiere Date 07/12/16

Should you go to Mars? ft Bill Nye
S1 E28 Length 09:04 Premiere Date 06/28/16

Exploding soda cans with electromagnets in SLOW MOTION ft Joe Hanson
S1 E27 Length 07:55 Premiere Date 06/14/24

World's Easiest DIY Electric Train
S1 E26 Length 05:44 Premiere Date 06/07/16

How SMOOTHNESS of a SOCCER BALL affects curve
S1 E25 Length 05:44 Premiere Date 05/24/16

Bizarre spinning toys
S1 E24 Length 04:56 Premiere Date 05/03/16

How science explains monster waves
S1 E23 Length 05:49 Premiere Date 04/27/16

Could you replace your eye with a camera?
S1 E22 Length 05:37 Premiere Date 04/12/16

How does laser cooling work?
S1 E21 Length 05:27 Premiere Date 03/30/16

Can you call a cell phone in the microwave?
S1 E20 Length 07:05 Premiere Date 03/22/16

Is energy always conserved?
S1 E19 Length 05:16 Premiere Date 03/15/16

Quantum Cryptography Explained
S1 E18 Length 07:47 Premiere Date 03/01/16

Why do we care about gravitational waves?
S1 E17 Length 04:29 Premiere Date 02/19/16

Five Weird Ways to Put Out a Candle
S1 E16 Length 05:04 Premiere Date 02/09/16

The Black Hole Death Problem
S1 E15 Length 04:48 Premiere Date 02/02/16

Can you push a spacecraft with light?
S1 E14 Length 04:35 Premiere Date 01/19/16

Five amazing stars we've discovered in space
S1 E13 Length 06:25 Premiere Date 01/12/16

Five Physics Experiments for the Holidays
S1 E12 Length 02:51 Premiere Date 12/22/15

Are perpetual motion machines possible?
S1 E11 Length 05:01 Premiere Date 12/08/15

Are MRIs safe?
S1 E10 Length 06:35 Premiere Date 12/01/15

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S1 E9 Length 04:40 Premiere Date 11/10/15

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S1 E8 Length 04:51 Premiere Date 10/27/15

AMAZING! Ferrofluid and Glow Sticks
S1 E7 Length 04:24 Premiere Date 10/20/15

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S1 E6 Length 04:50 Premiere Date 10/06/15

Epic Space Rescues
S1 E5 Length 06:19 Premiere Date 09/29/15

How 3D holograms work
S1 E4 Length 04:04 Premiere Date 09/15/15

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S1 E3 Length 05:02 Premiere Date 09/08/15

How to Make a Cloud in Your Mouth
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How to Make a Hurricane on a Bubble
S1 E1 Length 03:28 Premiere Date 08/18/15

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