it depends where it is, how fast its going, whre its coming from...... ect.....
Comets are classified based on the length of their orbital period and their origin. Short-period comets have orbital periods less than 200 years, while long-period comets have longer orbital periods. Comets can also be classified based on their composition and physical characteristics, such as size and brightness.
Mars.
Comets are Comets and Asteroids are Asteroids
Comets are typically observed before sunrise or after sunset when the sky is dark enough to see their faint tails against the backdrop of space. This is because comets are most visible at these times when they are illuminated by the sun but not obscured by the brightness of daylight.
Comets!
Comets are classified based on the length of their orbital period and their origin. Short-period comets have orbital periods less than 200 years, while long-period comets have longer orbital periods. Comets can also be classified based on their composition and physical characteristics, such as size and brightness.
Comets were most likely made on day 4 of creation when God created the sun,moon and stars.
Comets appear when they do; they don't run on a schedule. Hundreds of amateur comet hunters are watching the skies every day. In fact, several new comets have been seen this year; unfortunately, those comets have fallen into the Sun.
Mars.
the length of day on earth is 24 hours
Mars
The length of the day in th US is the same as the length of the day anywhere else in the world, roughly 24 hours.
The singular form is comet, the plural form is comets, the possessive plural is comets'. Example: The comets' paths will not cross.
Comets are Comets and Asteroids are Asteroids
the length of a day on Jupiter is average, 9.9 hours
the length of the day is not a fixed unit of time
See answer given for length of Venus day in hours.