Star System Generated (Seed: 1768589900)
Star Details
Spectral Class: M8V
Temperature: 2,617 K
Mass: 0.28 sol
Luminosity: 0.01 lux
Habitable Zone (HZ)
Inner Boundary: 0.1 AU
Outer Boundary: 0.14 AU
Physical Limits
Snow Line: 0.48 AU
Max System Radius: 10.6 AU
Planetary System (6 Planets)
Planet 1 - Gas Giant
Semi-Major Axis: 0.93 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 838.6
Radius: 12.7
Gravity: 5.2 G
Time & Orbit
Eccentricity (e): 0.222
Orbit Range: 0.72 AU - 1.14 AU
Year: 619 Days
Day: 10.7 Hours
Environment
Temp: -182 °C
Axial Tilt: 39 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (50)
Outer Limit: 69,275,267 km
- M1: 172,337 km (0.057 R)
- M2: 256,710 km (0.091 R)
- M3: 366,814 km (0.077 R)
- M4: 464,651 km (0.072 R)
- M5: 552,465 km (0.071 R)
- M6: 642,672 km (0.111 R)
- M7: 738,714 km (0.104 R)
- M8: 861,534 km (0.109 R)
- M9: 964,158 km (0.041 R)
- M10: 1,123,630 km (0.111 R)
- M11: 1,212,940 km (0.078 R)
- M12: 1,298,510 km (0.073 R)
- M13: 1,548,637 km (0.098 R)
- M14: 1,772,884 km (0.116 R)
- M15: 1,928,317 km (0.117 R)
- M16: 2,015,233 km (0.118 R)
- M17: 2,148,076 km (0.09 R)
- M18: 2,322,058 km (0.07 R)
- M19: 2,438,296 km (0.111 R)
- M20: 2,524,614 km (0.078 R)
- M21: 2,644,292 km (0.06 R)
- M22: 2,733,153 km (0.072 R)
- M23: 2,856,123 km (0.061 R)
- M24: 3,031,451 km (0.119 R)
- M25: 3,201,843 km (0.046 R)
- M26: 3,384,053 km (0.111 R)
- M27: 3,543,226 km (0.081 R)
- M28: 3,650,637 km (0.106 R)
- M29: 3,951,927 km (0.116 R)
- M30: 4,138,475 km (0.034 R)
- M31: 4,270,870 km (0.075 R)
- M32: 4,385,462 km (0.107 R)
- M33: 4,472,079 km (0.108 R)
- M34: 4,844,278 km (0.102 R)
- M35: 5,175,638 km (0.064 R)
- M36: 5,308,331 km (0.073 R)
- M37: 5,442,071 km (0.05 R)
- M38: 5,556,065 km (0.108 R)
- M39: 5,712,993 km (0.095 R)
- M40: 6,387,979 km (0.112 R)
- M41: 6,552,387 km (0.074 R)
- M42: 6,685,080 km (0.116 R)
- M43: 6,919,201 km (0.058 R)
- M44: 7,009,259 km (0.117 R)
- M45: 7,122,205 km (0.111 R)
- M46: 7,315,635 km (0.088 R)
- M47: 7,430,377 km (0.097 R)
- M48: 7,626,649 km (0.094 R)
- M49: 7,719,549 km (0.045 R)
- M50: 7,801,230 km (0.072 R)
Planet 2 - Gas Giant
Semi-Major Axis: 2.58 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 950.1
Radius: 11.1
Gravity: 7.71 G
Time & Orbit
Eccentricity (e): 0.141
Orbit Range: 2.22 AU - 2.94 AU
Year: 2860 Days
Day: 13.5 Hours
Environment
Temp: -215 °C
Axial Tilt: 28.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (72)
Outer Limit: 69,275,267 km
- M1: 148,700 km (0.054 R)
- M2: 240,404 km (0.058 R)
- M3: 388,206 km (0.045 R)
- M4: 621,430 km (0.1 R)
- M5: 867,518 km (0.084 R)
- M6: 1,061,247 km (0.05 R)
- M7: 1,145,321 km (0.094 R)
- M8: 1,359,396 km (0.114 R)
- M9: 1,505,104 km (0.088 R)
- M10: 1,614,460 km (0.087 R)
- M11: 1,712,447 km (0.082 R)
- M12: 1,826,889 km (0.094 R)
- M13: 1,914,404 km (0.071 R)
- M14: 2,263,565 km (0.053 R)
- M15: 2,373,969 km (0.113 R)
- M16: 3,611,143 km (0.058 R)
- M17: 3,778,094 km (0.055 R)
- M18: 3,871,892 km (0.114 R)
- M19: 4,081,329 km (0.118 R)
- M20: 4,235,864 km (0.043 R)
- M21: 4,412,240 km (0.106 R)
- M22: 4,511,273 km (0.1 R)
- M23: 5,038,157 km (0.067 R)
- M24: 5,141,679 km (0.086 R)
- M25: 5,372,209 km (0.049 R)
- M26: 5,477,975 km (0.067 R)
- M27: 6,305,401 km (0.069 R)
- M28: 7,761,886 km (0.113 R)
- M29: 8,294,155 km (0.078 R)
- M30: 8,763,443 km (0.111 R)
- M31: 8,913,490 km (0.103 R)
- M32: 9,292,272 km (0.094 R)
- M33: 9,547,635 km (0.071 R)
- M34: 9,702,020 km (0.117 R)
- M35: 9,883,333 km (0.057 R)
- M36: 10,013,333 km (0.112 R)
- M37: 10,327,938 km (0.092 R)
- M38: 10,645,833 km (0.101 R)
- M39: 10,725,868 km (0.101 R)
- M40: 11,591,292 km (0.087 R)
- M41: 11,701,097 km (0.043 R)
- M42: 12,060,281 km (0.117 R)
- M43: 12,283,182 km (0.105 R)
- M44: 12,563,678 km (0.104 R)
- M45: 12,648,201 km (0.039 R)
- M46: 12,846,268 km (0.109 R)
- M47: 13,245,395 km (0.101 R)
- M48: 13,331,414 km (0.036 R)
- M49: 13,706,606 km (0.12 R)
- M50: 14,085,238 km (0.049 R)
- M51: 14,319,957 km (0.106 R)
- M52: 14,615,263 km (0.073 R)
- M53: 14,763,664 km (0.071 R)
- M54: 14,852,974 km (0.09 R)
- M55: 14,942,434 km (0.06 R)
- M56: 15,573,587 km (0.088 R)
- M57: 15,846,753 km (0.094 R)
- M58: 16,060,379 km (0.038 R)
- M59: 16,152,232 km (0.079 R)
- M60: 17,582,088 km (0.11 R)
- M61: 17,898,188 km (0.12 R)
- M62: 19,116,962 km (0.032 R)
- M63: 19,279,276 km (0.106 R)
- M64: 19,507,413 km (0.046 R)
- M65: 19,801,971 km (0.087 R)
- M66: 19,900,406 km (0.118 R)
- M67: 20,163,848 km (0.038 R)
- M68: 20,494,908 km (0.059 R)
- M69: 21,465,050 km (0.112 R)
- M70: 22,108,621 km (0.103 R)
- M71: 22,245,054 km (0.103 R)
- M72: 22,689,958 km (0.114 R)
Planet 3 - Gas Giant
Semi-Major Axis: 3.53 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 148
Radius: 10.9
Gravity: 1.25 G
Time & Orbit
Eccentricity (e): 0.164
Orbit Range: 2.95 AU - 4.11 AU
Year: 4578 Days
Day: 7.9 Hours
Environment
Temp: -224 °C
Axial Tilt: 37.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (68)
Outer Limit: 69,275,267 km
- M1: 139,874 km (0.109 R)
- M2: 266,135 km (0.113 R)
- M3: 403,615 km (0.09 R)
- M4: 533,466 km (0.072 R)
- M5: 762,351 km (0.11 R)
- M6: 831,315 km (0.115 R)
- M7: 1,230,442 km (0.082 R)
- M8: 1,323,492 km (0.106 R)
- M9: 1,419,085 km (0.101 R)
- M10: 1,944,473 km (0.051 R)
- M11: 2,017,327 km (0.09 R)
- M12: 2,115,912 km (0.09 R)
- M13: 2,606,444 km (0.107 R)
- M14: 2,837,423 km (0.071 R)
- M15: 2,962,487 km (0.109 R)
- M16: 3,348,599 km (0.101 R)
- M17: 3,750,867 km (0.104 R)
- M18: 3,981,099 km (0.114 R)
- M19: 4,423,310 km (0.11 R)
- M20: 4,683,161 km (0.106 R)
- M21: 4,864,773 km (0.093 R)
- M22: 5,048,629 km (0.09 R)
- M23: 5,457,929 km (0.077 R)
- M24: 5,579,402 km (0.078 R)
- M25: 5,949,059 km (0.099 R)
- M26: 6,200,084 km (0.112 R)
- M27: 6,436,149 km (0.052 R)
- M28: 6,619,855 km (0.088 R)
- M29: 6,842,607 km (0.1 R)
- M30: 6,954,805 km (0.099 R)
- M31: 7,086,750 km (0.096 R)
- M32: 7,487,074 km (0.104 R)
- M33: 7,583,565 km (0.111 R)
- M34: 7,699,802 km (0.072 R)
- M35: 7,875,281 km (0.076 R)
- M36: 8,012,761 km (0.097 R)
- M37: 8,131,243 km (0.104 R)
- M38: 8,230,426 km (0.073 R)
- M39: 8,450,036 km (0.07 R)
- M40: 8,610,853 km (0.092 R)
- M41: 8,793,213 km (0.104 R)
- M42: 9,264,746 km (0.105 R)
- M43: 9,618,694 km (0.115 R)
- M44: 10,019,467 km (0.106 R)
- M45: 10,339,756 km (0.063 R)
- M46: 10,533,635 km (0.109 R)
- M47: 11,232,556 km (0.101 R)
- M48: 11,320,968 km (0.112 R)
- M49: 11,677,011 km (0.083 R)
- M50: 11,878,819 km (0.043 R)
- M51: 12,263,285 km (0.049 R)
- M52: 12,422,906 km (0.093 R)
- M53: 12,928,697 km (0.109 R)
- M54: 13,230,884 km (0.039 R)
- M55: 13,324,234 km (0.105 R)
- M56: 13,441,369 km (0.084 R)
- M57: 13,511,829 km (0.098 R)
- M58: 13,960,623 km (0.088 R)
- M59: 14,127,275 km (0.035 R)
- M60: 14,945,874 km (0.088 R)
- M61: 15,410,077 km (0.099 R)
- M62: 15,631,631 km (0.093 R)
- M63: 15,903,899 km (0.113 R)
- M64: 16,003,232 km (0.104 R)
- M65: 16,077,882 km (0.078 R)
- M66: 16,755,261 km (0.076 R)
- M67: 16,881,671 km (0.089 R)
- M68: 17,084,675 km (0.106 R)
Planet 4 - Gas Giant
Semi-Major Axis: 3.71 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 847
Radius: 8.8
Gravity: 10.94 G
Time & Orbit
Eccentricity (e): 0.153
Orbit Range: 3.14 AU - 4.28 AU
Year: 4933 Days
Day: 14.2 Hours
Environment
Temp: -210 °C
Axial Tilt: 31.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (86)
Outer Limit: 69,275,267 km
- M1: 174,282 km (0.062 R)
- M2: 243,695 km (0.079 R)
- M3: 375,191 km (0.06 R)
- M4: 664,514 km (0.061 R)
- M5: 780,003 km (0.055 R)
- M6: 1,002,605 km (0.037 R)
- M7: 1,183,020 km (0.109 R)
- M8: 1,390,363 km (0.119 R)
- M9: 1,732,493 km (0.066 R)
- M10: 2,043,806 km (0.099 R)
- M11: 2,333,278 km (0.119 R)
- M12: 2,635,765 km (0.059 R)
- M13: 2,697,848 km (0.089 R)
- M14: 3,080,370 km (0.113 R)
- M15: 3,548,461 km (0.112 R)
- M16: 3,617,127 km (0.119 R)
- M17: 3,755,804 km (0.065 R)
- M18: 4,158,522 km (0.06 R)
- M19: 4,451,285 km (0.058 R)
- M20: 4,725,348 km (0.088 R)
- M21: 5,030,827 km (0.06 R)
- M22: 5,421,576 km (0.038 R)
- M23: 6,343,548 km (0.113 R)
- M24: 6,455,148 km (0.095 R)
- M25: 6,879,707 km (0.082 R)
- M26: 7,052,044 km (0.096 R)
- M27: 7,342,563 km (0.104 R)
- M28: 7,489,318 km (0.09 R)
- M29: 7,577,731 km (0.08 R)
- M30: 7,935,269 km (0.079 R)
- M31: 8,085,765 km (0.109 R)
- M32: 8,481,750 km (0.063 R)
- M33: 8,728,587 km (0.066 R)
- M34: 9,197,875 km (0.117 R)
- M35: 9,292,721 km (0.104 R)
- M36: 9,356,150 km (0.092 R)
- M37: 9,579,200 km (0.109 R)
- M38: 9,804,046 km (0.093 R)
- M39: 10,987,664 km (0.1 R)
- M40: 11,767,369 km (0.072 R)
- M41: 11,870,292 km (0.042 R)
- M42: 12,042,629 km (0.086 R)
- M43: 12,250,570 km (0.103 R)
- M44: 13,523,049 km (0.113 R)
- M45: 13,847,676 km (0.079 R)
- M46: 13,956,434 km (0.036 R)
- M47: 14,652,064 km (0.092 R)
- M48: 15,396,613 km (0.08 R)
- M49: 16,459,356 km (0.095 R)
- M50: 16,728,782 km (0.119 R)
- M51: 16,922,062 km (0.119 R)
- M52: 16,999,554 km (0.101 R)
- M53: 17,077,195 km (0.092 R)
- M54: 17,389,107 km (0.103 R)
- M55: 17,545,586 km (0.082 R)
- M56: 17,978,822 km (0.085 R)
- M57: 18,295,969 km (0.116 R)
- M58: 18,775,281 km (0.092 R)
- M59: 19,501,878 km (0.089 R)
- M60: 19,868,692 km (0.067 R)
- M61: 20,196,610 km (0.082 R)
- M62: 20,485,035 km (0.057 R)
- M63: 20,650,490 km (0.107 R)
- M64: 21,149,399 km (0.1 R)
- M65: 21,358,537 km (0.093 R)
- M66: 22,159,334 km (0.116 R)
- M67: 22,499,370 km (0.098 R)
- M68: 22,712,846 km (0.116 R)
- M69: 23,270,846 km (0.039 R)
- M70: 24,225,580 km (0.104 R)
- M71: 25,060,486 km (0.101 R)
- M72: 25,237,460 km (0.087 R)
- M73: 25,770,776 km (0.084 R)
- M74: 25,860,086 km (0.087 R)
- M75: 26,307,833 km (0.119 R)
- M76: 26,622,886 km (0.044 R)
- M77: 27,666,780 km (0.106 R)
- M78: 28,354,631 km (0.114 R)
- M79: 29,048,316 km (0.064 R)
- M80: 30,122,578 km (0.09 R)
- M81: 30,546,539 km (0.063 R)
- M82: 30,735,631 km (0.075 R)
- M83: 30,972,444 km (0.116 R)
- M84: 31,162,433 km (0.068 R)
- M85: 31,925,981 km (0.062 R)
- M86: 32,069,744 km (0.085 R)
Planet 5 - Gas Giant
Semi-Major Axis: 3.89 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 121.9
Radius: 12.2
Gravity: 0.82 G
Time & Orbit
Eccentricity (e): 0.084
Orbit Range: 3.56 AU - 4.22 AU
Year: 5296 Days
Day: 13.9 Hours
Environment
Temp: -210 °C
Axial Tilt: 3.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (57)
Outer Limit: 69,275,267 km
- M1: 247,285 km (0.111 R)
- M2: 377,435 km (0.082 R)
- M3: 489,783 km (0.061 R)
- M4: 746,942 km (0.119 R)
- M5: 924,964 km (0.085 R)
- M6: 1,068,278 km (0.069 R)
- M7: 1,168,210 km (0.105 R)
- M8: 1,421,629 km (0.118 R)
- M9: 1,623,735 km (0.105 R)
- M10: 1,751,941 km (0.101 R)
- M11: 1,981,873 km (0.045 R)
- M12: 2,157,650 km (0.079 R)
- M13: 2,351,828 km (0.114 R)
- M14: 2,484,671 km (0.085 R)
- M15: 2,565,603 km (0.048 R)
- M16: 2,855,823 km (0.077 R)
- M17: 3,012,303 km (0.1 R)
- M18: 3,468,427 km (0.098 R)
- M19: 3,930,983 km (0.082 R)
- M20: 4,331,307 km (0.054 R)
- M21: 4,495,266 km (0.036 R)
- M22: 4,913,991 km (0.077 R)
- M23: 5,136,892 km (0.101 R)
- M24: 5,825,341 km (0.093 R)
- M25: 6,061,257 km (0.088 R)
- M26: 6,189,761 km (0.1 R)
- M27: 6,300,464 km (0.111 R)
- M28: 6,636,910 km (0.086 R)
- M29: 6,788,303 km (0.064 R)
- M30: 7,249,363 km (0.072 R)
- M31: 7,346,751 km (0.112 R)
- M32: 7,483,783 km (0.094 R)
- M33: 7,780,286 km (0.05 R)
- M34: 7,900,114 km (0.102 R)
- M35: 8,222,348 km (0.112 R)
- M36: 8,344,270 km (0.117 R)
- M37: 8,921,568 km (0.112 R)
- M38: 9,088,819 km (0.095 R)
- M39: 9,341,789 km (0.06 R)
- M40: 10,641,046 km (0.099 R)
- M41: 10,774,188 km (0.076 R)
- M42: 11,493,156 km (0.031 R)
- M43: 11,743,882 km (0.037 R)
- M44: 12,930,193 km (0.116 R)
- M45: 13,333,957 km (0.053 R)
- M46: 13,669,805 km (0.04 R)
- M47: 13,935,490 km (0.093 R)
- M48: 14,276,274 km (0.11 R)
- M49: 14,644,435 km (0.099 R)
- M50: 14,990,754 km (0.042 R)
- M51: 15,165,035 km (0.036 R)
- M52: 15,440,146 km (0.08 R)
- M53: 15,540,676 km (0.097 R)
- M54: 15,894,026 km (0.057 R)
- M55: 16,660,266 km (0.064 R)
- M56: 16,763,339 km (0.108 R)
- M57: 16,970,083 km (0.111 R)
Asteroid Belt
Center: 5.84 AU
Composition
Type: Outer System (Icy)
A dense region of planetesimals and debris.
Boundary
Planet 6 - Ice Giant
Semi-Major Axis: 7.79 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 918.1
Radius: 6
Gravity: 25.5 G
Time & Orbit
Eccentricity (e): 0.112
Orbit Range: 6.92 AU - 8.66 AU
Year: 15008 Days
Day: 15.6 Hours
Environment
Temp: -224 °C
Axial Tilt: 32.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (91)
Outer Limit: 69,275,267 km
- M1: 92,152 km (0.101 R)
- M2: 177,124 km (0.04 R)
- M3: 241,750 km (0.111 R)
- M4: 649,105 km (0.115 R)
- M5: 735,274 km (0.096 R)
- M6: 1,789,490 km (0.045 R)
- M7: 2,879,609 km (0.111 R)
- M8: 3,507,172 km (0.037 R)
- M9: 4,712,632 km (0.054 R)
- M10: 4,882,276 km (0.082 R)
- M11: 5,097,248 km (0.112 R)
- M12: 5,447,606 km (0.099 R)
- M13: 5,625,778 km (0.072 R)
- M14: 6,264,112 km (0.089 R)
- M15: 6,497,634 km (0.041 R)
- M16: 6,734,148 km (0.117 R)
- M17: 8,210,978 km (0.118 R)
- M18: 8,312,854 km (0.112 R)
- M19: 9,248,888 km (0.057 R)
- M20: 9,837,257 km (0.1 R)
- M21: 10,881,600 km (0.086 R)
- M22: 12,718,961 km (0.03 R)
- M23: 12,836,844 km (0.11 R)
- M24: 13,733,384 km (0.088 R)
- M25: 13,793,821 km (0.106 R)
- M26: 16,670,140 km (0.086 R)
- M27: 16,928,794 km (0.103 R)
- M28: 17,449,993 km (0.109 R)
- M29: 18,308,236 km (0.096 R)
- M30: 18,374,807 km (0.041 R)
- M31: 18,776,029 km (0.118 R)
- M32: 18,977,687 km (0.071 R)
- M33: 19,315,479 km (0.047 R)
- M34: 19,451,164 km (0.064 R)
- M35: 19,928,381 km (0.09 R)
- M36: 19,996,897 km (0.09 R)
- M37: 20,547,716 km (0.079 R)
- M38: 21,103,622 km (0.044 R)
- M39: 21,594,004 km (0.072 R)
- M40: 22,372,212 km (0.095 R)
- M41: 24,028,709 km (0.096 R)
- M42: 24,761,290 km (0.069 R)
- M43: 25,575,551 km (0.058 R)
- M44: 26,098,246 km (0.1 R)
- M45: 26,323,241 km (0.112 R)
- M46: 26,473,737 km (0.089 R)
- M47: 27,154,108 km (0.108 R)
- M48: 28,070,245 km (0.057 R)
- M49: 28,455,011 km (0.12 R)
- M50: 28,609,396 km (0.117 R)
- M51: 28,996,555 km (0.096 R)
- M52: 30,247,193 km (0.108 R)
- M53: 32,075,429 km (0.073 R)
- M54: 32,477,698 km (0.11 R)
- M55: 32,800,680 km (0.063 R)
- M56: 33,775,908 km (0.088 R)
- M57: 34,843,139 km (0.078 R)
- M58: 36,590,293 km (0.071 R)
- M59: 37,347,856 km (0.062 R)
- M60: 37,516,902 km (0.105 R)
- M61: 39,135,401 km (0.104 R)
- M62: 39,393,009 km (0.05 R)
- M63: 39,565,196 km (0.081 R)
- M64: 41,125,053 km (0.059 R)
- M65: 41,824,722 km (0.096 R)
- M66: 42,000,201 km (0.057 R)
- M67: 43,947,366 km (0.052 R)
- M68: 45,201,595 km (0.114 R)
- M69: 46,649,553 km (0.076 R)
- M70: 47,013,824 km (0.113 R)
- M71: 47,105,078 km (0.025 R)
- M72: 48,942,140 km (0.033 R)
- M73: 52,590,982 km (0.063 R)
- M74: 53,445,485 km (0.101 R)
- M75: 53,540,629 km (0.084 R)
- M76: 54,879,680 km (0.093 R)
- M77: 54,975,722 km (0.068 R)
- M78: 55,553,319 km (0.102 R)
- M79: 55,649,810 km (0.09 R)
- M80: 57,103,302 km (0.051 R)
- M81: 57,200,691 km (0.118 R)
- M82: 58,765,634 km (0.105 R)
- M83: 61,438,499 km (0.078 R)
- M84: 61,638,063 km (0.082 R)
- M85: 63,645,517 km (0.047 R)
- M86: 64,657,247 km (0.075 R)
- M87: 64,758,674 km (0.084 R)
- M88: 65,776,239 km (0.107 R)
- M89: 66,389,291 km (0.117 R)
- M90: 67,209,686 km (0.101 R)
- M91: 67,827,226 km (0.069 R)
Kuiper Belt
Range: 30 - 53 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 526 - 15,189 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.