Far away in the galaxy "Stáda Oloca" (which means "Road of Milk") lies the terrestrial planet Lacerta. Lacerta is the second of eight planets to the class K star Trûro, a sun much smaller and cooler than our own, which means a life-supporting planet has to be much closer to its star than Earth is.

The Star: Trûro

Trûro is Lacerta's sun. It is only about 80% of our own sun's size, so approximately 1,110,000 km in diameter. This has a great effect not only on its temperature, but also on its luminosity, which is only about 36% of our own sun's brightness. All in all, this gives Trûro a habitable ecosphere radius between 0.5 and 0.85 AU ("astronomical units"). Here is the complete list of planets in the Trûro System (The planet sizes are to scale in the picture, though the distances are not.):

The Planets

Trûro has eight planets in all, of which Lacerta is the second.

#1: Timarte

Timarte is a small, hot, rocky planet with no atmosphere. It's surface gravity is only about half as strong as Earth's, and it's average temperature lies at 45°C. In other words, it is completely uninhabitable without incredibly advanced technology. (orbit: 0.428 AU)

#2: Lacerta

Lacerta is a terrestrial planet. It is a little colder and wetter than Earth, and its atmosphere is composed in largely the same way as our own, i.e. about three quarters nitrogen and one quarter oxygen. The average surface temperature is 8.8°C and gravity is only slightly lower than ours. It is thus entirely inhabitable by humans. Sizewise, Lacerta has a diameter of 11,831 km (93% of Earth's size).
Lacerta has two moons: Rocky Diavesh is smaller and closer to Lacerta than bright, icy Glámid. Glámid takes a bit more than 13 local days to orbit Lacerta. Hence, a Lacertan month is 13 days long and a year has eight months. Lacerta takes a little less than 207 Earth days to orbit Trûro once. However, Lacerta also spinns faster than Earth does, which means Lacerta has just over 104 days per year, each day lasting about 47.53 of our hours. Its mass is significantly lower than Earth, due to the relative rareness of metals in its core. The rather strong axial tilt of 29° leads to slightly extremer seasons than on Earth. Lacerta's night sky is not as bright as ours, due to the fact that Trûro's system is located at the very edge of the Stáda Oloca.

#3: Renizenta

Renizenta is a large gas dwarf consisting mostly of Hydrogen and Helium. It is three times Lacerta's size and can regularly be seen from Lacerta as a large blue disc in the sky. In fact it is such a prominent celestial phenomenon that it has the same level of importance in Lacertan thinking as sun and moons. (orbit: 1.763 AU)

#4: Tigrac

Tigrac is a large gas giant, comparable to Jupiter in our own solar system. (orbit: 4.466 AU)

#5: Tadec

Tadec is an even bigger gas giant. With an orbit of 11.984 AU, it is the first after a large gap in the planets' orbits.

#6: Petranol

Petranol is a cold, rocky planet, about the same size as Earth. It has no significant atmosphere. (orbit: 19.732 AU)

#7: Baeli

Baeli is a very small gas giant. In fact, it's actually a little smaller than the gas dwarf Fereje! (orbit 35.285 AU)

#8: Jotopef

Jotopef is the smallest, coldest, and most distant planet in the Trûro system. It is actually little more than a large asteroid. (orbit: 43.928 AU)

Other Features

There is an asteroid belt between Tigrac and Tadec, though it is no-where near as dense as the one between Mars and Jupiter in our own solar system. There are also a couple of comets, but they too are scarce, due to Trûro's position at the very edge of the galaxy.