选用下列的其中五个(或五个以上)的单词,用英文写一篇约80词的短文,gravity（万有引力）float（漂浮物.使..漂浮）astronomy（天文学）solarsystem(太阳系)satellite(卫星；人造卫星)spaceship（宇宙飞船

Question

选用下列的其中五个(或五个以上)的单词,用英文写一篇约80词的短文,
gravity（万有引力）
float（漂浮物.使..漂浮）
astronomy（天文学）
solar system(太阳系)
satellite(卫星；人造卫星)
spaceship（宇宙飞船）
theory（学说；理论）
Isaac Newton（牛顿）
cheer up（感到兴奋）
pull（拉力；牵引力）
weightlessly（失重的）
puzzle（难题；谜）
physicist（物理学家）
climate（气候）
exist（生存）
dinosaur（恐龙）
extinct（灭绝的；绝种的）
in time（及时）
now that（既然）
lessen（减少）

Answer 1

Since Lsaac Netwon difined gravity,which used to be a puzzle in front of many physicists,human beings have nver stopped the efforts to explore the far end of the solar sytem.As the basic knowledge of astronmy,it is well known that there are a lot of planets are weightlessly floating around in the universe.And with the advane of the technology,we have successfully get right of the pull of gravity and send satellites and spaceships into the space.