7th Math

I previously posted this today at 5:33 am and I am reposting this because I don't want this to be buried with other unanswered questions and I realized this was the wrong subject.
How do I answer this question/problem? I can't input the following scientific notations in a calculator and would like to know how to solve it. Thank you tutors.

The four other recognized dwarf planets in the solar system and their estimated masses in kilograms (kg) are:
Haumea: 4.006 x 10 to the power of 21 kg Ceres: 9.39 x 10 to the power of 20 kg
Eris: 1.67 x 10 to the power of 22 kg
Makemake: 3.0 x 10 to the power of 21 kg

Pluto's mass is 1.305 x 10 to the power of 22 kg. Order these five dwarf planets from most massive to least massive.

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  1. Er 1.7 *10^22
    P 1.3*10^22
    Ha 4*10^21
    Ma 3*10^21
    Ce 9 * 10^20

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  2. You just told me the answer, and now that I overlook it I can see that I could've just listed the highest decimal/mass and rounded it. Thank you tutor Damon.

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