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Scientific notation is used to show numbers raised to powers of ten. Pluto is a planet. Therefore, Pluto cannot be put into scientific notation because there are no numbers in Pluto to put to a power of ten...
Planet Mars has a mass of 639 x 1021 kilograms (639,000,000,000,000,000,000,000kg)
I can't tell if you're referring to the planet or the element. The radius of the planet is about 1.516 x 10^3 miles.
Oh, dude, 1.989E30 is just a fancy way of saying 1.989 followed by 30 zeroes. It's like saying "I have a gazillion dollars" but in scientific notation. So, if you're looking to buy something with that amount, you might want to consider investing in a planet or two.
It is a difference of scale. Interplanetary means between planets; it takes a ray of light minutes or hours to go from a planet to another planet. Intergalactic means between galaxies; it takes a ray of light hundreds of thousands of years, or even millions of years, to travel that distance.