Kryptonian

Kyptonians are a sapient humanoid species that hails from the now destroyed planet Krypton, which was in orbit around a small red dwarf star, Rao. The Kryptonians' appearance is indistinguishable from that of Humans and other Human-like races, but they have a much more complex DNA/RNA nature and cellular structure, which allows them to absorb enormous quantities of sunlight radiation. When exposed to a sun much larger/younger than their own and with a different frequency of light and internal radiation, like Earth's yellow dwarf, Kryptonians absorb and motabolize so much solar energy in their cells that they become virtually invunerable and capable of super strength, speed, agility, durability, reflexes, senses, and possessing such abilities as flight, heat vision, microscopic/telescopic vision, freeze breath, super breath, healing-factor, and x-ray vision. Which, if any, of these abilities are natural and which are only possible under Earth's gravitational/solar conditions, is still unclear. Kryptonians are vulnerable to kryptonite, a radioactive substance formed from the remains of their destroyed homeworld which become radiated once exposed to yellow solar radiation, black holes cunsume them completely, and their near indistructability grants them no protection from supernatural forces. They are also depowered once exposed to the precise frequency (natural or synthetic) of their native red dwarf sun.

Technology
Kryptonian technology and architecture was mostly based on giant self-grown crystals which were very common on their planet and could be used to store information. These structures might have been natural or artificial, or a combination of both. Kryptonian technology was so advanced, that they had the potential to download inscriptions onto the very electrons of their ships and metals.

Survivors
The kryptonian people were a very xenophobic race who hardly ever left their planet, making Superman (Kal-El) the only Kryptonian who left when the planet exploded.

Culture
The Kryptonians had two primary culture traits: science and worriorism. The political powers on the planet were governed by a council of scientists and worriors (mostly scientists). Each noble Kryptonian family (or "House") was symbolized by perticular symbols which resemble Earth's alfabetical letters (such as "S" for El or "Z" for Zod). The red dwarf star, Rao of Krypton's solar system was worshiped as a god, but in a more scientific manner than Earth's spiritual religions. Kryptonian Dogs were kept as pets by the Kryptonian people, much like Earth Dogs are kept as pets by Humans.