* Orbital Speed: A planet's orbital speed is determined by its distance from the sun and the sun's gravitational pull. The closer a planet is, the stronger the gravitational pull, and the faster it needs to move to stay in orbit. Think of it like a spinning top – the faster it spins, the more stable it is against gravity.
* Surface Temperature: The closer a planet is to the sun, the more direct sunlight it receives. This means it absorbs more energy from the sun, leading to a higher surface temperature.
It's important to note that other factors, like a planet's atmosphere and its ability to reflect sunlight, can also play a role in determining its surface temperature.
