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(I'm going to assume that when you said "first" you meant "fastest," because otherwise the question is nonsense.)
Because of Kepler's Third Law. The orbital period for a body is related to the semimajor axis of its orbit. Mercury's orbit has the shortest semimajor axis of all the Solar planets, and therefore it has the shortest orbital period.
What else can I help you with?
Which planet has the shortest orbit around the sun?
Mercury, because it is the closest to the sun. Mercury takes 88 days to orbit the sun.
How many hours does it take for mercury to orbit the sun?
Mercury takes 87.97 days to orbit the Sun, and there are 24 hours in a day.
Does Mercury or Venus take longer to orbit the sun?
Venus, farther from the Sun than Mercury, takes longer to orbit. the Sun.
What is the orbit from the sun?
mercury
How long does it take in days for the planet Mercury to orbit the Sun?
Mercury's orbit of the sun takes 87.969 days.
What is the time taken by mercury to complete an orbit around the sun?
Mercury takes 87.969 days to orbit the sun.
Which planet completes its journey first around the sun .why?
If you mean which planet orbits the Sun the quickest it's the planet Mercury. Mercury is the closest planet to the Sun and the closer an object is to the Sun the faster it must go around to avoid falling into the Sun.
What happeneds if Mercury passes the sun?
Mercury travels in a 'circular' orbit around the Sun, just as the Earth does. How can it pass the Sun? If you mean leave it's orbit, the Sun's gravity will pull Mercury in and 'melt it.
How many days does it take to orbit Mercury?
Mercury is the closest planet to the sun and it is the fastest to orbit the sun. It takes 88 days for the Mercury to completely orbit the sun.
Witch planet in your solar system has the smallest orbit?
The orbit closest to the sun is the smallest. That distinction belongs to Mercury.
What is the orbit from the sun to mercury?
The average distance from the sun to mercury is 57.9 million kilometres.
Does Mercury have the smallest orbit?
YES Mercury is the closest planet to the Sun The further away you are the larger the orbit I think it must be Mercury because it is the closest planet to the sun
