Mercury's mass is 0.055 times the mass of the Earth. In kilograms, Mercury has 3.3022×1023 kg. Writing this in "standard form" - I assume you mean, not in scientific notation - really doesn't make sense for such large numbers. But you can do it if you like - just move the decimal point 23 digits to the right, and fill out missing digits with zeros.
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The mass of Mercury is approximately 3.285 x 10^23 kilograms. This is equivalent to 3.285 followed by 23 zeros in standard form. Mercury is the smallest planet in our solar system, but it still has a substantial mass due to its dense composition.
The mass of Mars is approximately 6.42 x 10^23 kilograms. This can also be written as 642,000,000,000,000,000,000,000 kilograms in standard form. Mars is the fourth planet from the Sun and has a mass that is about 0.107 times that of Earth.
How do write 666 in standard form?
That is the standard form!
It is already in standard form.
It is already in standard form.