Size of universe

puZZle

somewhereintime

It is cool!

matt72178

原來地球只係粒塵。拒最尾0個半邊係寫 "Our Sun", 0甘係咪即係太陽大過晒全部?

number_12

太陽只係大過地球少少嘅另一粒塵

puZZle

原帖由 matt72178 於 2008-9-27 20:48 發表
原來地球只係粒塵。拒最尾0個半邊係寫 "Our Sun", 0甘係咪即係太陽大過晒全部?

our sun 細到睇唔到

i didn't know that there are stars (observable by humans right now) that huge

and these huge stars are even smaller than dust in their own galaxies/star systems

chunsh

原帖由 number_12 於 2008-9-27 23:03 發表
太陽只係大過地球少少嘅另一粒塵

to be more specific, sun should the about the size of electron (relative to the whole universe) and probably even smaller than that

puZZle

u mean the  whole known universe?

Hyde

If a human could walk on the surface of Canis Majoris – assuming a speed of 5 km/h (3 mph) for 8 hours a day – the person would have to walk for 650,000 years to circle the star (compared with 2 years 11 months to complete the same task on the Earth, and 310 years 7 months on the Sun).

[ 本帖最後由 Hyde 於 2008-9-28 17:05 編輯 ]

puZZle

matt72178

科學家究竟點可以知道 13 billion 光年距離0甘遠既野?
Very interesting video.
Thanks for sharing~