pruthvi ka gurutv

naasa ke gres mission dvaara maapa gaya dharati ka gurutv : yeh maanachitr dharati ko poornat: samatal (smooth) maankar nikaale gaye maan ('maanak maan') se kaheen kam aur kaheen adhik hai. laal rang vaale kshetr ve hain gurutv jahaaain 'maanak maan' se adhik hai, neele rang vaale kshetron mein gurutv 'maanak maan' se kam hai aur hare kshetron mein 'maanak maan' ke baraabar hai.

pruthvi ke gurutv, vah tvaran hai jisse pruthvi ke satah ke nikat ki vastueain pruthvi ki or gati karateen hain (yadi ve gati karne ke liye svatantr hon tatha un par koi anya bal na lag raha ho). ise g se darshaaya jaata hai. iski SI ikaai meter/varg sekend (ise m/s2 ya m·aas-2 likha jaata hai) hai. iska maan lagbhag 9.81 m/s2 hota hai.