Doppler Effect
Doppler Effect We have heard an ambulance sirens and felt that the ambulance is getting closer. When the ambulance approaches, the sirens sound higher, and when they move away, the sirens sound…
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Star and Galaxy Simulation
Apparent magnitude, Absolute magnitude, and Distance to stars
Star brightness and apparent magnitude Hipparchus of ancient Greece distinguished the stars in the night sky according to their brightness. He classified the brightest star as ‘magnitude 1’ and the darkest star…
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Stellar Parallax – 3D VR
Parallax When an object is close to me, you can use a ruler to measure the distance. But, it is difficult to measure when the object is away from me. In this…
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3D Location of the Ursa Minor(Polaris)
Constellations and distance to stars If you look at the sky where there is no light on a clear night, there are so many stars can not count. Thousands of years ago,…
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Stellar Classification
Surface temperature and color of object When the iron is heated, it first turns dark red. As the temperature of the iron increases, it gradually becomes closer to yellow. This is because…
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Parallax of Eyes
Parallax When an object is close to me, you can use a ruler to measure the distance. But, it is difficult to measure when the object is away from me. In this…
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Distance of 1 pc(parsec)
Parallax When an object is close to me, you can use a ruler to measure the distance. But, it is difficult to measure when the object is away from me. In this…
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Stellar Parallax
Parallax When an object is close to me, you can use a ruler to measure the distance. But, it is difficult to measure when the object is away from me. In this…
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Constellations
Constellations If you look at the sky where there is no light on a clear night, there are so many stars can not count. Thousands of years ago, the ancients linked stars…
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Doppler Effect and RedShift
Doppler Effect We have heard an ambulance sirens and felt that the ambulance is getting closer. When the ambulance approaches, the sirens sound higher, and when they move away, the sirens sound…
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