Insta Science Class on Instagram: "Rare video of the famous astronomer Carl Sagan shows him gently answering a child’s question in Cosmos: A Personal Voyage (Episode 7), where a little girl asks why Earth is round and not square or any other shape. Sagan explains that the key lies in gravity, which pulls everything toward the center of mass. On a large scale, this constant inward pull smooths out sharp edges and corners, making a sphere the most natural and stable form for planets. Smaller bodie
0:56
Instagraminstascienceclass
Insta Science Class on Instagram: "Rare video of the famous astronomer Carl Sagan shows him gently answering a child’s question in Cosmos: A Personal Voyage (Episode 7), where
261 likes, 1 comments - instascienceclass on September 6, 2025: "Rare video of the famous astronomer Carl Sagan shows him gently answering a child’s question in Cosmos: A Personal Voyage (Episode 7), where a little girl asks why Earth is round and not square or any other shape. Sagan explains that the key lies in gravity, which pulls ...
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Regarde à quel point la taille de l’Univers est colossale. Voici la planète Terre… et voici le Soleil. En moyenne, ils sont séparés par 150 millions de kilomètres. La lumière, la chose la plus rapide que nous connaissons, met environ 8 minutes pour voyager du Soleil jusqu’à la Terre, même en se déplaçant à 300 000 kilomètres par seconde. Maintenant, pour aller du Soleil jusqu’à Neptune, la planète la plus éloignée du Système solaire, la lumière mettrait environ 4 heures. Et pour traverser tout l
1:11
Regarde à quel point la taille de l’Univers est colossale. Voici la planète Terre… et voici le Soleil. En moyenne, ils sont séparés par 150 millions de kilomètres. La lumière, la chose la plus rapide que nous connaissons, met environ 8 minutes pour voyager du Soleil jusqu’à la Terre, même en se déplaçant à 300 000 kilomètres par seconde. Maintenant, pour aller du Soleil jusqu’à Neptune, la planète la plus éloignée du Système solaire, la lumière mettrait environ 4 heures. Et pour traverser tout l
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