Mars News:  Mars is once again a garden world, though its prisons, crime, drug problems, and orbital quarantine hinder study.
Mars
Mars

Note:
Mars has been terraformed so it has oceans and habitable regions, but it still has some of its signature rust-colored deserts.

History:
3.5 Billion Years Ago (BYA):  Abundant liquid water is on the surface of Mars; oceans and rivers.
3.5 to 1.8 BYA:  Mars is a garden world (Class M), but volcanic and tectonic activity begins to end, and the atmosphere is eventually lost, rendering Mars frozen.  Details here.
5 Million Years Ago (MYA):  Mars' obliquity is ~60°​.
4 MYA:​  Mars' obliquity becomes 55° as ice areas begin major shifts.
3 MYA:  Mars' obliquity becomes 45°
2 MYA:  Mars' obliquity becomes 35°
1 MYA:​​​  Mars' obliquity becomes 25°.  Details here.
????:  Thousands, perhaps millions, of years ago, the Cydonia complex was built on Mars.
1659:  Mars is spotted by humans on Earth.
1972:  Mariner 9 orbits Mars.
1976:  Viking 1 Lander lands on Mars.
2025:  SpaceX begins building human colonies on Mars.
2100:  Mars has dozens of major cities.​​
2200:  Mars​ terraforming is underway.
2300:  Mars terraforming nearly complete.
2400:  Crime escalates in multiple cities on Mars, and Mars starts to become a prison planet.
2490:  Most innocents are relocated from Mars to other human-colonized worlds.​
2495:  The S.P.A. uses Mars as an impact range and testing ground for new military equipment.​​​
2500:  Most cities on Mars are now in ruins, and the S.P.A. uses Mars as a prison planet.​
2505:  Drug trafficking escalates to multiple prison-cities on Mars.​​​
2511:  The S.P.A. uses Mars' Space armada ​​​​to assist with anti drug trafficking operations there.


Special Features:
TBA.
火星
 
---[Planet Data]---
Stellar ID:  
Class: 
Radius: 
Mass:  
Keplerian Ratio:
Luminosity: 
Surface Temperature:
Surface Gravity:
Atmospheric Pressure: 
Orbital Distance:  
Orbital Period:
Day Length:

---[Status]---
Colonized:  
Terraformed:  

---[Moons]--- 
2; Phobos and Deimos

---[Rings]--- 
0

---[Artificial Satellites]---
(thousands)

---[Indigenous]---
? (uncertain; though colonized and terraformed, Mars remains largely
    ​unexplored)
Sol 4
M
3,390 km
.107 Earth
N/A
N/A
-207°F to 80°F
3.711 m/s² (.38 Earth)
1 atm (was .006 prior to terraforming)
1.524 AU (227,987,155 km; = to 5,689 times around the Earth)
1.88 Earth Years (668.5921 actual days on Mars)
24h 37m 22s
Yes; 2100s
Yes; 2400s