太陽があるのに、宇宙はなぜ真っ暗？青空が消える理由【ゆっくり解説】
空のなぜ【ゆっくり解説】
1,139 views
Why is space dark even though the Sun is shining?
Reimu and Marisa explain light scattering in Earth's blue sky, why stars may be missing from space photographs, the Moon's black daytime sky, and blue sunsets on Mars.
Light passing through a place is not the same as that place looking bright. Discover how light and the atmosphere change the sky we see.
Chapters
00:00 Introduction
00:51 Light is there—so why is it dark?
03:23 What creates the blue sky?
06:25 Where does the blue sky disappear?
09:03 Why stars vanish from space photographs
11:24 What color is the sky on the Moon and Mars?
14:02 Dark space and our familiar blue sky
Related videos
Rain Clouds Aren't Really Black: What Makes Them Look Dark?
雨雲は、本当は黒くない｜あの黒さの正体とは？【ゆっくり解説】
Oxygen Was Once Toxic! Tiny Life That Changed Earth's Atmosphere
酸素は昔、猛毒だった!? 地球の空を変えた小さな生命【ゆっくり解説】
Notes
The Moon has an extremely thin exosphere; this does not mean there is absolutely no gas.
The blue color of Martian sunsets is especially noticeable near the Sun.
The darkness of space and the absence of stars in photographs are explained separately.
Illustrations and diagrams explain concepts; they are not to scale or actual spacecraft footage.
Do not look directly at the Sun.
References
JAXA: Why Is Space Dark in Photos Even When the Sun Is There?
https://iss.jaxa.jp/kids/faq/kidsfaq0...
Japan Meteorological Agency: Clouds, Atmospheric Phenomena and Atmospheric Optics
https://www.jma.go.jp/jma/kishou/know...
NASA: Why Is the Sky Blue?
https://spaceplace.nasa.gov/blue-sky/en/
NASA: Where Are the Stars?
https://science.nasa.gov/blogs/earth-...
NASA: The Moon's Atmosphere
https://science.nasa.gov/moon/lunar-a...
NASA: Color Variations in the Sky at Sunset
https://science.nasa.gov/resource/col...
FAI: Statement about the Karman Line
https://www.fai.org/news/statement-ab...
NASA: Why Is Space Black?
https://starchild.gsfc.nasa.gov/docs/...
NASA: Wave Behaviors
https://science.nasa.gov/ems/03_behav...
Sora no Naze [Yukkuri Explained]
Exploring the science behind everyday questions about the sky, weather and space.
@soranonazeyukkuri
Sister channel: Nihon no Naze [Yukkuri Explained]
@nazenihondakeyukkuri
Materials and music
Characters: Kitsune Yukkuri / Touhou Project fan work
Voice: AquesTalk, used under a license appropriate to the applicable terms.
Music: Amacha Music Studio (composer: Amacha)
球体
https://amachamusic.chagasi.com/music...
フィヨルドの澄んだ風
https://amachamusic.chagasi.com/music...
小さな足あと
https://amachamusic.chagasi.com/music...
Backgrounds and illustrations: AI-generated anime-style imagery. Diagrams and sound effects are original work.
#Space #BlueSky #Yukkuri
太陽があるのに、宇宙はなぜ真っ暗？青空が消える理由【ゆっくり解説】
空のなぜ【ゆっくり解説】
1,139 views
Why is space dark even though the Sun is shining?
Reimu and Marisa explain light scattering in Earth's blue sky, why stars may be missing from space photographs, the Moon's black daytime sky, and blue sunsets on Mars.
Light passing through a place is not the same as that place looking bright. Discover how light and the atmosphere change the sky we see.
Chapters
00:00 Introduction
00:51 Light is there—so why is it dark?
03:23 What creates the blue sky?
06:25 Where does the blue sky disappear?
09:03 Why stars vanish from space photographs
11:24 What color is the sky on the Moon and Mars?
14:02 Dark space and our familiar blue sky
Related videos
Rain Clouds Aren't Really Black: What Makes Them Look Dark?
雨雲は、本当は黒くない｜あの黒さの正体とは？【ゆっくり解説】
Oxygen Was Once Toxic! Tiny Life That Changed Earth's Atmosphere
酸素は昔、猛毒だった!? 地球の空を変えた小さな生命【ゆっくり解説】
Notes
The Moon has an extremely thin exosphere; this does not mean there is absolutely no gas.
The blue color of Martian sunsets is especially noticeable near the Sun.
The darkness of space and the absence of stars in photographs are explained separately.
Illustrations and diagrams explain concepts; they are not to scale or actual spacecraft footage.
Do not look directly at the Sun.
References
JAXA: Why Is Space Dark in Photos Even When the Sun Is There?
https://iss.jaxa.jp/kids/faq/kidsfaq0...
Japan Meteorological Agency: Clouds, Atmospheric Phenomena and Atmospheric Optics
https://www.jma.go.jp/jma/kishou/know...
NASA: Why Is the Sky Blue?
https://spaceplace.nasa.gov/blue-sky/en/
NASA: Where Are the Stars?
https://science.nasa.gov/blogs/earth-...
NASA: The Moon's Atmosphere
https://science.nasa.gov/moon/lunar-a...
NASA: Color Variations in the Sky at Sunset
https://science.nasa.gov/resource/col...
FAI: Statement about the Karman Line
https://www.fai.org/news/statement-ab...
NASA: Why Is Space Black?
https://starchild.gsfc.nasa.gov/docs/...
NASA: Wave Behaviors
https://science.nasa.gov/ems/03_behav...
Sora no Naze [Yukkuri Explained]
Exploring the science behind everyday questions about the sky, weather and space.
@soranonazeyukkuri
Sister channel: Nihon no Naze [Yukkuri Explained]
@nazenihondakeyukkuri
Materials and music
Characters: Kitsune Yukkuri / Touhou Project fan work
Voice: AquesTalk, used under a license appropriate to the applicable terms.
Music: Amacha Music Studio (composer: Amacha)
球体
https://amachamusic.chagasi.com/music...
フィヨルドの澄んだ風
https://amachamusic.chagasi.com/music...
小さな足あと
https://amachamusic.chagasi.com/music...
Backgrounds and illustrations: AI-generated anime-style imagery. Diagrams and sound effects are original work.
#Space #BlueSky #Yukkuri