Short-Question

# How long does it take for planet 9 to orbit the sun?

## How long does it take for planet 9 to orbit the sun?

Instead of orbiting our home star once every 18,500 years, astronomers calculate that it loops around the sun in about 7,400 years. That tighter orbit brings it much closer to the sun than previously expected, which means that Planet Nine may appear brighter to Earth-based telescopes.

## What is the 9th planet in our solar system?

In 1930, Pluto was discovered and officially named the ninth planet. However, in 1978, Pluto was determined to be too low in mass to have caused these perturbations, so the possibility of a tenth planet was proposed.

How cold is planet 9?

Assuming that it is a smaller version of the ice giants Uranus and Neptune, with hydrogen and helium dominating its atmosphere, the pair calculated that a 10-Earth-mass Planet Nine would be about 3.7 times wider than our planet. Temperatures would average minus 375 degrees Fahrenheit (minus 226 degrees Celsius).

### How long does it take Neptune to rotate on its axis?

Neptune : The planet Neptune tales about 16 hours, 6 minutes, 36 seconds for one complete rotation, as evidenced by its visible blue outer atmosphere. Q: How long does it take for each of the planets to rotate on its axis?

### How long does it take for the Earth to rotate?

Earth : Earth has a “siderial” (absolute rotation period) of 23 hours 56 minutes. Mars : Mars’ day is very close to Earth’s at 24.6 Earth hours (it spins slower but is much smaller).

How often does each of the planets rotate?

Each planet spins at a different speed, giving each a “day” of varying length (see the exceptions below for Venus and Uranus). Mercury : Mercury completes one rotation every 58.65 Earth days. Venus : Venus rotates slowly, in a clockwise (retrograde) direction, once every 243 Earth Days.

#### How big is Planet Nine’s orbit around the Sun?

Orbit Planet Nine is hypothesized to follow an elliptical orbit around the Sun with an eccentricity of 0.2 to 0.5. The planet’s semi-major axis is estimated to be 400 to 800 AU, roughly 13 to 26 times the distance from Neptune to the Sun. It would take the planet between 10,000 and 20,000 years to make one full orbit around the Sun.