Sky Dust Keeps Falling on Your Head

• 出 处: 数理天地(高中版)
• 发表日期: 2005年Z1期
• 关键词: chunks settle perfectly sunny planet probably bench outside outer visible

Any time you go outside,you get pummeled by in-visible storms of dust.Even on a perfectly sunny day,you inhale pieces of dead bugs.Floating specks of hairand pollen settle on your skin.Tiny chunks of cometsmight even fall on your head from outer space. “Every time you sit on a bench,you’re sitting on cosmic dust,”says astronomer Don Brownlee from the University of Washington in Seattle.In fact,6 million pounds of space dust settle on the planet every year,he says.“If you’re outside during the day,you’re probably

Any time you go outside,you get pummeled by in-visible storms of dust.Even on a perfectly sunny day,you inhale pieces of dead bugs.Floating specks of hair and pollen settle on your skin.Tiny chunks of cometsmight even fall on your head From outer space. ”Every time you sit on a bench,you’re sitting on cosmic dust,“says astronomer Don Brownlee from the University of Washington in Seattle.In fact,6 million pounds of space settle static the planet Year,he says.”If you’re outside during the day, you’re probably