System03: This young star system contains only four infant planets, and is roughly 520 million years old. Dust debris still float around the region today. The star's mass is roughly that of the Sun, and is a more orange color.
A: A is a small planet just like Mercury: it orbits close to its star, it contains extreme temperatures, is tidally locked to the star, and has a small mass. It formed 85 million years after the formation of its star. It takes 8 days to finish a revolution.
B: B is a unique planet; it experienced a huge, but indirect collision causing it to turn 40 degrees in tilt. It has a mass that of Earth, and orbits around the star every 50 days. The planet's surface is almost cooled, and its atmosphere consists of mostly vaporized rock. Average temperatures on this planet are around 70C(158F) but nightly temperatures can drop. It formed 128 million years after the formation of its star.
C: C is a planet that is likely to have life in the future, because it's within the habitable zone. This planet is really similar to Earth, because its mass and density are identical. This planet is still a living hell, with temperatures at 50C(122F, that's the maximum temperature I could give the planet.) The planet formed 95 million years after the formation of its star.
D: D is a gas dwarf planet that formed 76,450 years after the formation of its star. Its composition is mainly hydrogen, helium, methane, ammonia, water-ice, and other traces. It has no rings, and orbits its star every 1.34 years. This planet is only 9 Earth masses, and temperatures are as low as -130C(-200F)
Enjoy!