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The Seven Wonders Patrick Ep2 Planetary Defense Observation
Manage episode 391480127 series 3010862
Pour pouvoir se proteger du risque d’impact, il y a d’abord une chose a faire, c’est de decouvrir ces objets et de predire leur arrivee sur Terre. Cela n’est pas simple car ce sont de tous petits objets qui emettent une tres faible luminosite, donc cela necessite une tres grande couverture du ciel. On le fait depuis la Terre avec telescopes, et on a rescense la plupart des corps de plus d’un kilometre de diametre qui peuvent nous tomber dessus, mais aucun ne nous menacent sur l’ordre du siecle. A present, on essaye de faire l’inventaire des corps plus grand que 140km de diametre, ce qui est le seuil de taille pour une catastrophe a l’echelle d’un pays ou d’une region. On en connait a ce jour que 40%. Pour decouvrir les prochains 60%, depuis la Terre il faudrait plusieurs decennies meme avec les plus grands telescopes, c’est donc un grand defi. En fait, l’idee est de placer un telescope dans l’espace qui pourra en faire l’inventaire en 10 ans et c’est d’ailleurs l’objectif de la NASA avec la mission NEO Surveyor. To protect us from this impact risk, there is first a thing to do: discover those bodies and predict their arrival on Earth. It is not that easy because they are tiny objects emitting a very weak luminosity, demanding a vast sky covering. We do it from Earth with telescopes, and we have already discovered most of the objects more than a kilometer in diameter that could fall on us. Still, none of them are a threat for this century. Now, we try to make an inventory of bodies larger than 140km in diameter, which is the threshold size for a disaster of the size of a country or a region. We know so far about 40% of them. Discovering the next 60% from Earth would take decades, even by using the largest telescopes, so it is a consequent challenge. In fact, the idea is to place in space a telescope that can make this inventory within 10 years. This is NASA's objective with their mission NEO Surveyor.
56 episodios
Manage episode 391480127 series 3010862
Pour pouvoir se proteger du risque d’impact, il y a d’abord une chose a faire, c’est de decouvrir ces objets et de predire leur arrivee sur Terre. Cela n’est pas simple car ce sont de tous petits objets qui emettent une tres faible luminosite, donc cela necessite une tres grande couverture du ciel. On le fait depuis la Terre avec telescopes, et on a rescense la plupart des corps de plus d’un kilometre de diametre qui peuvent nous tomber dessus, mais aucun ne nous menacent sur l’ordre du siecle. A present, on essaye de faire l’inventaire des corps plus grand que 140km de diametre, ce qui est le seuil de taille pour une catastrophe a l’echelle d’un pays ou d’une region. On en connait a ce jour que 40%. Pour decouvrir les prochains 60%, depuis la Terre il faudrait plusieurs decennies meme avec les plus grands telescopes, c’est donc un grand defi. En fait, l’idee est de placer un telescope dans l’espace qui pourra en faire l’inventaire en 10 ans et c’est d’ailleurs l’objectif de la NASA avec la mission NEO Surveyor. To protect us from this impact risk, there is first a thing to do: discover those bodies and predict their arrival on Earth. It is not that easy because they are tiny objects emitting a very weak luminosity, demanding a vast sky covering. We do it from Earth with telescopes, and we have already discovered most of the objects more than a kilometer in diameter that could fall on us. Still, none of them are a threat for this century. Now, we try to make an inventory of bodies larger than 140km in diameter, which is the threshold size for a disaster of the size of a country or a region. We know so far about 40% of them. Discovering the next 60% from Earth would take decades, even by using the largest telescopes, so it is a consequent challenge. In fact, the idea is to place in space a telescope that can make this inventory within 10 years. This is NASA's objective with their mission NEO Surveyor.
56 episodios
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