Question

Express the given information in Scientific notation and then arrange them in descending order of their size.

SI.No.	Name of the Planet	Mass (in kg)
1.	Mercury	330000000000000000000000
2.	Venus	4870000000000000000000000
3.	Earth	5980000000000000000000000
4.	Mars	642000000000000000000000
5.	Jupiter	1900000000000000000000000000
6.	Saturn	569000000000000000000000000
7.	Uranus	86900000000000000000000000
8.	Neptune	102000000000000000000000000
9.	Pluto	13100000000000000000000

Answer 1

A number is written in standard form as a × 10^k, where a is terminating decimal and k is an integer.

SI.No.	Name of the Planet	Mass (in kg) (in standard from)
1.	Mercury	3.3 × 1023
2.	Venus	4.87 × 1024
3.	Earth	5.98 × 1024
4.	Mars	6.42 × 1023
5.	Jupiter	1.9 × 1027
6.	Saturn	5.69 × 1026
7.	Uranus	8.69 × 1025
8.	Neptune	1.02 × 1026
9.	Pluto	1.31 × 1022

Two numbers written in scientific notation can be compared. The number with the larger power of 10 is greater than the number with the smaller power of 10. If the powers of ten are the same, then the number with larger factor is the larger number.

Hence, the required descending order of the size will be Jupiter > Saturn > Neptune > Uranus > Earth > Venus > Mars > Mercury > Pluto.