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If we see two Cepheid variable stars
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Secrets of Size: Atoms to Supergalaxies

If we see two Cepheid variable stars and they're pulsingat the same rate, then we know...

If we see two Cepheid variable stars and they're pulsing
at the same rate, then we know they must also
have the same brightness

Full Transcript

00:00:01.000 --> 00:00:04.439
If we see two Cepheid variable stars
00:00:04.044 --> 00:00:07.439
and they're pulsing at the same rate,
00:00:07.044 --> 00:00:11.999
then we know they must also have the same brightness.
Duration
12 seconds
Views
15
Timestamp in Movie
00:20:30
Uploaded
May 06, 2025
Season
1
Episode
2
Genres
documentary

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Movie Summary

In this mind-bending series, Jim Al-Khalili explores the vast range of size in the universe, from tiny atoms to gigantic, interconnected galaxies.
S01 • E01 See, it might look to you like a flat black square - Secrets of Size: Atoms to Supergalaxies 00:10
See, it might look to you like a flat black square
S01 • E02 So, if one seems dimmer to us, - Secrets of Size: Atoms to Supergalaxies 00:07
So, if one seems dimmer to us,
S01 • E01 And yet, looking at it face on, - Secrets of Size: Atoms to Supergalaxies 00:06
And yet, looking at it face on,
S01 • E02 Leavitt had found a way we can measure huge distances in space. - Secrets of Size: Atoms to Supergalaxies 00:06
Leavitt had found a way we can measure huge distances in spa...
S01 • E01 Now, normally when we see objects, - Secrets of Size: Atoms to Supergalaxies 00:13
Now, normally when we see objects,
S01 • E02 In 1923, Edwin Hubble pointed a telescope - Secrets of Size: Atoms to Supergalaxies 00:12
In 1923, Edwin Hubble pointed a telescope
S01 • E01 Light falls on the surface and then just disappears forever. - Secrets of Size: Atoms to Supergalaxies 00:05
Light falls on the surface and then just disappears forever.
S01 • E01 What's perhaps most surprising - Secrets of Size: Atoms to Supergalaxies 00:07
What's perhaps most surprising
S01 • E02 He measured its pulse rate to be very slow - 31 days. - Secrets of Size: Atoms to Supergalaxies 00:05
He measured its pulse rate to be very slow - 31 days.
S01 • E02 So, using Leavitt's discovery, - Secrets of Size: Atoms to Supergalaxies 00:07
So, using Leavitt's discovery,
S01 • E01 The paint, called Vantablack, - Secrets of Size: Atoms to Supergalaxies 00:07
The paint, called Vantablack,
S01 • E02 But because it looked so faint when seen from Earth, - Secrets of Size: Atoms to Supergalaxies 00:07
But because it looked so faint when seen from Earth,
S01 • E02 In fact, the Andromeda Galaxy is two and a half million light years away. - Secrets of Size: Atoms to Supergalaxies 00:07
In fact, the Andromeda Galaxy is two and a half million ligh...
S01 • E01 So it just looks like a black surface here, - Secrets of Size: Atoms to Supergalaxies 00:07
So it just looks like a black surface here,
S01 • E02 So the mystery of these faint, wispy nebulae was solved. - Secrets of Size: Atoms to Supergalaxies 00:06
So the mystery of these faint, wispy nebulae was solved.
S01 • E01 So, if you imagine a forest of trees, - Secrets of Size: Atoms to Supergalaxies 00:09
So, if you imagine a forest of trees,
S01 • E02 As suspected, some of them are indeed collections of gas and dust, - Secrets of Size: Atoms to Supergalaxies 00:08
As suspected, some of them are indeed collections of gas and...
S01 • E01 So light comes in, photons come in, - Secrets of Size: Atoms to Supergalaxies 00:08
So light comes in, photons come in,
S01 • E02 But others, like Andromeda, are their own independent galaxies - Secrets of Size: Atoms to Supergalaxies 00:10
But others, like Andromeda, are their own independent galaxi...
S01 • E01 So, as you can see on here, - Secrets of Size: Atoms to Supergalaxies 00:07
So, as you can see on here,