外太阳系发现不寻常彗星！质量是典型彗星的1000倍_中华网
china.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from china.com Daily Mail and Mail on Sunday newspapers.
外太阳系发现不寻常彗星 比典型彗星大1000倍以上
sina.com.cn - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from sina.com.cn Daily Mail and Mail on Sunday newspapers.
era of exploration. people landing on pluto, that s impossible, right, because of its distance and also the makeup we believe the surface is? it s impossible today, but who knows what tomorrow holds, and one of the things we re considering is sending humans out of our solar system and to a star system that s very distant from us. as we go out, we re going to need resources and the asteroids and the objects may serve as resources for us so who knows. all right. there s been a lot of debate and this has reinvigorated it whether pluto is a satellite or not circling neptune. it revolves around the same sun, but while it does that it actually crosses the or pit ofbit for 20 years out of its 214-year orbit. no planet does that. that s embarrassing. if you re a planet you should not be crossing another s orbit.
should pluto be embarrassed it s crossing neptune s orbit? it should not be embarrassed. there is a whole slew of objects that come across and cross neptune s orbit. what we now understand is we don t think of the solar system being the sun and nine planets, we think of it as the sun and different families of objects. the asteroids, the kuiper belt which pluto is a member of constitute these main families so some of those families are primarily dwarfs. pluto is large enough to be a sphere. some people think if it s large enough to be a sphere we should call it a planet. weave made we ve made a compromise and it s called a dwarf planet. new horizons what do you think is next for the frontier of space exploration? right now it s been an era of