291. NASA 4: 21
P1+P2:
- Deep Impact probe—comet Tempel 1—will arrive at its target,科学家希望观察探测器通过撞击彗星形成的陨石坑喷出的物质
P3:天文学家对comet感兴趣的原因:simpler and more primitive than planets、have changed little、a cosmic time capsule
P4:介绍Deep Impact probe的组成和它如何工作
P5:By observing how the crater forms, and the shape of the debris cloud, NASA's scientists hope to tell something about the rigidity of the comet's material and how porous it is.
- Amateur observers see Tempel 1 light up during the impact through a small telescope.
291. NASA
P1 - Deep Impact observed comet Tempel 1 will arrive at its target. This year's American Revolution will be celebrated with fireworks in the heavens.
P2 - Scientists hope to catch a glimpse of the material from which the earth and the other planets were formed from the ejection when probe hits the comet.
P3 - Comets are simpler and more primitive than planets.Planets are larger and prone to be altered by heating up and melting.
P4 - Deep Impact is composed of 2 vehicles- a mother ship to take photos and measure, and a bullet to smash into the comet.
P5 - By observing how the crater forms, and the shape of the debris cloud, scientists hope to tell the rigidity of the comet's material.
By analyzing the spectrum of lights from the debris, they find out the chemical composition.
Amateur in the western US should see the light-up through a telescope.
P1: background of Nasa
P3: Astronomers: comet - simple and primitive than planets
Comets: changed little = 宇宙外的时间胶囊
Planets: sig alteration as prone to heating up/melting
P4: DI: 1. mothership: take photo + measure 2. copper bullet: smash
P5: find rigidity of mateiral and how porous it is.
Analysing light from debris: (composition),US can see tempel 1 light up