Star System Generated (Seed: 1768322108)
Star Details
Spectral Class: M5V
Temperature: 3,050 K
Mass: 0.3 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: 11 AU
Planetary System (7 Planets)
Planet 1 - Gas Giant
Semi-Major Axis: 0.55 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 487.2
Radius: 11.8
Gravity: 3.5 G
Time & Orbit
Eccentricity (e): 0.146
Orbit Range: 0.47 AU - 0.63 AU
Year: 272 Days
Day: 6 Hours
Environment
Temp: -155 °C
Axial Tilt: 25 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (33)
Outer Limit: 46,950,789 km
- M1: 147,055 km (0.094 R)
- M2: 226,342 km (0.083 R)
- M3: 309,368 km (0.106 R)
- M4: 385,065 km (0.117 R)
- M5: 484,697 km (0.029 R)
- M6: 603,777 km (0.117 R)
- M7: 704,307 km (0.04 R)
- M8: 808,128 km (0.032 R)
- M9: 947,553 km (0.097 R)
- M10: 1,057,059 km (0.088 R)
- M11: 1,214,884 km (0.076 R)
- M12: 1,482,814 km (0.061 R)
- M13: 1,591,422 km (0.105 R)
- M14: 1,665,323 km (0.083 R)
- M15: 1,842,597 km (0.107 R)
- M16: 1,920,537 km (0.094 R)
- M17: 2,012,839 km (0.039 R)
- M18: 2,120,400 km (0.104 R)
- M19: 2,234,394 km (0.066 R)
- M20: 2,430,816 km (0.055 R)
- M21: 2,531,196 km (0.05 R)
- M22: 2,623,199 km (0.109 R)
- M23: 2,711,461 km (0.093 R)
- M24: 2,886,042 km (0.091 R)
- M25: 2,972,210 km (0.098 R)
- M26: 3,074,685 km (0.092 R)
- M27: 3,152,326 km (0.102 R)
- M28: 3,272,753 km (0.096 R)
- M29: 3,346,804 km (0.056 R)
- M30: 3,421,453 km (0.11 R)
- M31: 3,561,477 km (0.054 R)
- M32: 3,692,524 km (0.089 R)
- M33: 3,775,252 km (0.082 R)
Planet 2 - Gas Giant
Semi-Major Axis: 0.66 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 452.7
Radius: 11.4
Gravity: 3.48 G
Time & Orbit
Eccentricity (e): 0.014
Orbit Range: 0.65 AU - 0.67 AU
Year: 358 Days
Day: 7.1 Hours
Environment
Temp: -153 °C
Axial Tilt: 13.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (38)
Outer Limit: 46,950,789 km
- M1: 141,968 km (0.066 R)
- M2: 212,878 km (0.062 R)
- M3: 297,550 km (0.119 R)
- M4: 369,208 km (0.118 R)
- M5: 465,848 km (0.031 R)
- M6: 561,142 km (0.102 R)
- M7: 657,931 km (0.057 R)
- M8: 754,272 km (0.101 R)
- M9: 940,073 km (0.043 R)
- M10: 1,058,555 km (0.119 R)
- M11: 1,141,731 km (0.117 R)
- M12: 1,215,034 km (0.111 R)
- M13: 1,315,264 km (0.049 R)
- M14: 1,392,457 km (0.089 R)
- M15: 1,556,267 km (0.091 R)
- M16: 1,754,633 km (0.085 R)
- M17: 1,845,140 km (0.056 R)
- M18: 1,917,695 km (0.11 R)
- M19: 2,025,854 km (0.033 R)
- M20: 2,171,712 km (0.118 R)
- M21: 2,394,613 km (0.099 R)
- M22: 2,479,435 km (0.117 R)
- M23: 2,624,994 km (0.107 R)
- M24: 2,756,790 km (0.104 R)
- M25: 2,941,842 km (0.075 R)
- M26: 3,073,189 km (0.106 R)
- M27: 3,154,122 km (0.082 R)
- M28: 3,276,941 km (0.098 R)
- M29: 3,353,685 km (0.086 R)
- M30: 3,473,064 km (0.066 R)
- M31: 3,624,308 km (0.118 R)
- M32: 3,753,111 km (0.062 R)
- M33: 3,827,462 km (0.112 R)
- M34: 3,902,260 km (0.047 R)
- M35: 4,028,072 km (0.088 R)
- M36: 4,129,649 km (0.1 R)
- M37: 4,328,914 km (0.117 R)
- M38: 4,531,469 km (0.1 R)
Planet 3 - Gas Giant
Semi-Major Axis: 0.71 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 809.7
Radius: 15
Gravity: 3.6 G
Time & Orbit
Eccentricity (e): 0.241
Orbit Range: 0.54 AU - 0.88 AU
Year: 399 Days
Day: 9.2 Hours
Environment
Temp: -164 °C
Axial Tilt: 2.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (40)
Outer Limit: 46,950,789 km
- M1: 187,446 km (0.064 R)
- M2: 306,676 km (0.068 R)
- M3: 464,501 km (0.035 R)
- M4: 581,188 km (0.117 R)
- M5: 714,629 km (0.038 R)
- M6: 835,205 km (0.096 R)
- M7: 937,530 km (0.089 R)
- M8: 1,040,154 km (0.095 R)
- M9: 1,180,477 km (0.1 R)
- M10: 1,347,877 km (0.098 R)
- M11: 1,523,654 km (0.078 R)
- M12: 1,636,302 km (0.118 R)
- M13: 1,757,625 km (0.049 R)
- M14: 1,853,368 km (0.108 R)
- M15: 1,962,874 km (0.116 R)
- M16: 2,080,458 km (0.093 R)
- M17: 2,224,820 km (0.084 R)
- M18: 2,422,738 km (0.082 R)
- M19: 2,517,732 km (0.109 R)
- M20: 2,691,714 km (0.093 R)
- M21: 2,896,664 km (0.104 R)
- M22: 3,024,869 km (0.117 R)
- M23: 3,252,258 km (0.045 R)
- M24: 3,492,661 km (0.098 R)
- M25: 3,593,341 km (0.107 R)
- M26: 3,709,578 km (0.091 R)
- M27: 3,856,783 km (0.079 R)
- M28: 4,028,521 km (0.109 R)
- M29: 4,172,285 km (0.074 R)
- M30: 4,348,810 km (0.118 R)
- M31: 4,449,639 km (0.111 R)
- M32: 4,574,852 km (0.104 R)
- M33: 4,741,056 km (0.113 R)
- M34: 4,852,955 km (0.037 R)
- M35: 4,965,752 km (0.091 R)
- M36: 5,144,970 km (0.112 R)
- M37: 5,276,616 km (0.111 R)
- M38: 5,409,309 km (0.117 R)
- M39: 5,678,286 km (0.094 R)
- M40: 5,805,893 km (0.119 R)
Planet 4 - Gas Giant
Semi-Major Axis: 1.95 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 324.6
Radius: 9
Gravity: 4.01 G
Time & Orbit
Eccentricity (e): 0.227
Orbit Range: 1.51 AU - 2.39 AU
Year: 1816 Days
Day: 11.2 Hours
Environment
Temp: -191 °C
Axial Tilt: 27.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (71)
Outer Limit: 46,950,789 km
- M1: 123,867 km (0.052 R)
- M2: 308,620 km (0.1 R)
- M3: 380,577 km (0.029 R)
- M4: 681,269 km (0.036 R)
- M5: 753,824 km (0.101 R)
- M6: 914,791 km (0.079 R)
- M7: 1,003,503 km (0.108 R)
- M8: 1,165,816 km (0.074 R)
- M9: 1,262,456 km (0.075 R)
- M10: 1,362,089 km (0.042 R)
- M11: 1,569,282 km (0.045 R)
- M12: 1,703,920 km (0.1 R)
- M13: 1,777,372 km (0.079 R)
- M14: 2,111,574 km (0.093 R)
- M15: 2,210,757 km (0.082 R)
- M16: 2,311,437 km (0.11 R)
- M17: 2,444,728 km (0.111 R)
- M18: 2,559,470 km (0.1 R)
- M19: 2,838,021 km (0.04 R)
- M20: 2,992,107 km (0.053 R)
- M21: 3,459,301 km (0.069 R)
- M22: 3,635,976 km (0.078 R)
- M23: 3,695,516 km (0.034 R)
- M24: 3,839,729 km (0.081 R)
- M25: 3,986,035 km (0.054 R)
- M26: 4,084,471 km (0.1 R)
- M27: 4,372,147 km (0.115 R)
- M28: 4,461,009 km (0.115 R)
- M29: 4,901,425 km (0.098 R)
- M30: 4,980,562 km (0.098 R)
- M31: 5,060,148 km (0.085 R)
- M32: 5,126,869 km (0.092 R)
- M33: 5,478,124 km (0.103 R)
- M34: 5,560,403 km (0.079 R)
- M35: 5,656,744 km (0.083 R)
- M36: 5,795,571 km (0.052 R)
- M37: 5,865,284 km (0.075 R)
- M38: 5,963,570 km (0.096 R)
- M39: 6,048,092 km (0.116 R)
- M40: 6,318,715 km (0.068 R)
- M41: 6,506,161 km (0.085 R)
- M42: 6,651,570 km (0.082 R)
- M43: 6,916,059 km (0.101 R)
- M44: 7,243,978 km (0.062 R)
- M45: 7,319,225 km (0.071 R)
- M46: 7,440,250 km (0.113 R)
- M47: 7,592,391 km (0.086 R)
- M48: 8,008,423 km (0.117 R)
- M49: 8,305,524 km (0.111 R)
- M50: 8,368,505 km (0.092 R)
- M51: 8,447,493 km (0.066 R)
- M52: 8,574,501 km (0.111 R)
- M53: 9,007,587 km (0.087 R)
- M54: 9,072,363 km (0.063 R)
- M55: 9,234,976 km (0.06 R)
- M56: 9,530,132 km (0.09 R)
- M57: 9,778,465 km (0.106 R)
- M58: 9,845,036 km (0.078 R)
- M59: 9,995,531 km (0.12 R)
- M60: 10,079,306 km (0.082 R)
- M61: 10,247,753 km (0.032 R)
- M62: 10,383,289 km (0.086 R)
- M63: 10,519,273 km (0.104 R)
- M64: 10,621,748 km (0.12 R)
- M65: 10,707,318 km (0.079 R)
- M66: 10,862,002 km (0.092 R)
- M67: 10,982,877 km (0.041 R)
- M68: 11,104,052 km (0.103 R)
- M69: 11,295,537 km (0.07 R)
- M70: 11,558,380 km (0.108 R)
- M71: 11,823,318 km (0.115 R)
Planet 5 - Gas Giant
Semi-Major Axis: 2.14 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 788.8
Radius: 12.4
Gravity: 5.13 G
Time & Orbit
Eccentricity (e): 0.029
Orbit Range: 2.08 AU - 2.2 AU
Year: 2088 Days
Day: 8.6 Hours
Environment
Temp: -196 °C
Axial Tilt: 37.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (69)
Outer Limit: 46,950,789 km
- M1: 183,257 km (0.036 R)
- M2: 350,209 km (0.044 R)
- M3: 492,775 km (0.105 R)
- M4: 675,584 km (0.117 R)
- M5: 759,060 km (0.036 R)
- M6: 1,042,996 km (0.064 R)
- M7: 1,382,733 km (0.115 R)
- M8: 1,548,787 km (0.065 R)
- M9: 1,733,540 km (0.078 R)
- M10: 1,828,834 km (0.104 R)
- M11: 1,999,824 km (0.119 R)
- M12: 2,214,796 km (0.111 R)
- M13: 2,504,568 km (0.081 R)
- M14: 2,613,026 km (0.099 R)
- M15: 2,891,278 km (0.108 R)
- M16: 2,976,698 km (0.067 R)
- M17: 3,091,889 km (0.071 R)
- M18: 3,193,915 km (0.12 R)
- M19: 3,326,757 km (0.079 R)
- M20: 3,567,610 km (0.104 R)
- M21: 3,924,102 km (0.075 R)
- M22: 4,066,818 km (0.112 R)
- M23: 4,292,113 km (0.039 R)
- M24: 4,721,758 km (0.086 R)
- M25: 5,480,069 km (0.071 R)
- M26: 5,568,781 km (0.096 R)
- M27: 5,657,791 km (0.108 R)
- M28: 5,837,459 km (0.09 R)
- M29: 6,000,819 km (0.115 R)
- M30: 6,350,729 km (0.112 R)
- M31: 6,612,675 km (0.119 R)
- M32: 6,783,067 km (0.093 R)
- M33: 6,993,252 km (0.116 R)
- M34: 7,225,128 km (0.089 R)
- M35: 7,302,919 km (0.036 R)
- M36: 7,518,490 km (0.111 R)
- M37: 7,597,477 km (0.048 R)
- M38: 7,716,258 km (0.105 R)
- M39: 7,955,914 km (0.049 R)
- M40: 8,076,639 km (0.058 R)
- M41: 8,238,654 km (0.109 R)
- M42: 8,320,035 km (0.037 R)
- M43: 8,627,608 km (0.068 R)
- M44: 8,772,419 km (0.064 R)
- M45: 9,001,753 km (0.117 R)
- M46: 9,254,124 km (0.084 R)
- M47: 9,551,525 km (0.097 R)
- M48: 10,025,301 km (0.055 R)
- M49: 10,177,592 km (0.099 R)
- M50: 11,130,530 km (0.101 R)
- M51: 11,243,178 km (0.091 R)
- M52: 11,446,930 km (0.096 R)
- M53: 11,858,025 km (0.066 R)
- M54: 12,065,517 km (0.118 R)
- M55: 13,001,850 km (0.087 R)
- M56: 13,096,845 km (0.047 R)
- M57: 13,263,497 km (0.1 R)
- M58: 13,526,789 km (0.103 R)
- M59: 13,864,581 km (0.087 R)
- M60: 14,107,528 km (0.063 R)
- M61: 14,351,821 km (0.103 R)
- M62: 14,820,063 km (0.066 R)
- M63: 14,993,746 km (0.042 R)
- M64: 15,093,378 km (0.113 R)
- M65: 15,368,488 km (0.033 R)
- M66: 15,468,869 km (0.044 R)
- M67: 16,768,425 km (0.09 R)
- M68: 17,105,170 km (0.101 R)
- M69: 17,418,129 km (0.098 R)
Planet 6 - Gas Giant
Semi-Major Axis: 2.34 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 992.4
Radius: 12.6
Gravity: 6.25 G
Time & Orbit
Eccentricity (e): 0.218
Orbit Range: 1.83 AU - 2.85 AU
Year: 2387 Days
Day: 10.8 Hours
Environment
Temp: -203 °C
Axial Tilt: 32.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (73)
Outer Limit: 46,950,789 km
- M1: 163,959 km (0.06 R)
- M2: 409,449 km (0.069 R)
- M3: 565,181 km (0.092 R)
- M4: 706,700 km (0.047 R)
- M5: 861,534 km (0.078 R)
- M6: 975,079 km (0.075 R)
- M7: 1,482,365 km (0.072 R)
- M8: 1,804,898 km (0.036 R)
- M9: 1,913,058 km (0.109 R)
- M10: 2,037,224 km (0.088 R)
- M11: 2,150,021 km (0.081 R)
- M12: 2,323,405 km (0.119 R)
- M13: 2,638,009 km (0.12 R)
- M14: 3,014,547 km (0.094 R)
- M15: 3,143,799 km (0.095 R)
- M16: 3,258,690 km (0.101 R)
- M17: 3,425,043 km (0.109 R)
- M18: 3,560,280 km (0.106 R)
- M19: 3,783,929 km (0.067 R)
- M20: 3,976,760 km (0.069 R)
- M21: 4,299,592 km (0.098 R)
- M22: 4,409,098 km (0.075 R)
- M23: 4,519,501 km (0.067 R)
- M24: 4,780,849 km (0.099 R)
- M25: 5,124,176 km (0.108 R)
- M26: 5,299,056 km (0.06 R)
- M27: 5,396,893 km (0.11 R)
- M28: 6,099,554 km (0.081 R)
- M29: 6,202,328 km (0.081 R)
- M30: 6,894,966 km (0.029 R)
- M31: 7,436,211 km (0.05 R)
- M32: 7,789,860 km (0.067 R)
- M33: 7,968,779 km (0.041 R)
- M34: 8,149,045 km (0.064 R)
- M35: 8,422,061 km (0.108 R)
- M36: 8,698,069 km (0.068 R)
- M37: 9,141,178 km (0.119 R)
- M38: 9,401,179 km (0.067 R)
- M39: 9,591,767 km (0.107 R)
- M40: 9,759,615 km (0.085 R)
- M41: 10,268,996 km (0.07 R)
- M42: 11,288,506 km (0.099 R)
- M43: 11,592,937 km (0.115 R)
- M44: 12,106,507 km (0.09 R)
- M45: 12,262,089 km (0.073 R)
- M46: 12,680,065 km (0.074 R)
- M47: 12,758,903 km (0.119 R)
- M48: 12,970,135 km (0.094 R)
- M49: 13,129,308 km (0.078 R)
- M50: 13,369,263 km (0.106 R)
- M51: 13,503,302 km (0.09 R)
- M52: 14,535,976 km (0.058 R)
- M53: 14,950,512 km (0.104 R)
- M54: 15,201,238 km (0.095 R)
- M55: 15,819,825 km (0.111 R)
- M56: 15,933,220 km (0.111 R)
- M57: 16,332,048 km (0.058 R)
- M58: 16,418,067 km (0.089 R)
- M59: 16,504,086 km (0.085 R)
- M60: 17,023,639 km (0.041 R)
- M61: 17,285,436 km (0.107 R)
- M62: 17,636,542 km (0.087 R)
- M63: 18,049,282 km (0.104 R)
- M64: 18,345,935 km (0.07 R)
- M65: 18,524,854 km (0.115 R)
- M66: 18,884,188 km (0.098 R)
- M67: 19,427,527 km (0.102 R)
- M68: 19,518,633 km (0.093 R)
- M69: 19,640,256 km (0.065 R)
- M70: 20,006,770 km (0.062 R)
- M71: 20,190,776 km (0.106 R)
- M72: 20,375,380 km (0.093 R)
- M73: 20,622,515 km (0.084 R)
Planet 7 - Ice Giant
Semi-Major Axis: 9.22 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 184.7
Radius: 6.2
Gravity: 4.8 G
Time & Orbit
Eccentricity (e): 0.018
Orbit Range: 9.05 AU - 9.39 AU
Year: 18669 Days
Day: 17.4 Hours
Environment
Temp: -241 °C
Axial Tilt: 38.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (92)
Outer Limit: 46,950,789 km
- M1: 78,539 km (0.112 R)
- M2: 131,197 km (0.09 R)
- M3: 230,082 km (0.076 R)
- M4: 358,137 km (0.075 R)
- M5: 397,332 km (0.095 R)
- M6: 649,105 km (0.03 R)
- M7: 731,833 km (0.06 R)
- M8: 982,708 km (0.078 R)
- M9: 1,515,127 km (0.063 R)
- M10: 2,099,157 km (0.098 R)
- M11: 2,299,618 km (0.104 R)
- M12: 2,454,003 km (0.038 R)
- M13: 2,532,542 km (0.093 R)
- M14: 2,882,302 km (0.07 R)
- M15: 3,133,477 km (0.117 R)
- M16: 3,276,044 km (0.111 R)
- M17: 4,020,592 km (0.083 R)
- M18: 4,980,113 km (0.086 R)
- M19: 5,349,021 km (0.1 R)
- M20: 5,416,939 km (0.114 R)
- M21: 6,219,831 km (0.116 R)
- M22: 6,471,454 km (0.071 R)
- M23: 6,763,170 km (0.112 R)
- M24: 6,836,772 km (0.105 R)
- M25: 7,208,822 km (0.059 R)
- M26: 7,321,769 km (0.108 R)
- M27: 7,397,316 km (0.118 R)
- M28: 7,740,792 km (0.103 R)
- M29: 7,856,431 km (0.053 R)
- M30: 8,245,984 km (0.093 R)
- M31: 8,522,441 km (0.094 R)
- M32: 9,125,021 km (0.111 R)
- M33: 10,159,640 km (0.079 R)
- M34: 10,371,022 km (0.075 R)
- M35: 10,498,629 km (0.097 R)
- M36: 11,057,227 km (0.097 R)
- M37: 11,405,790 km (0.094 R)
- M38: 12,563,229 km (0.1 R)
- M39: 12,699,214 km (0.084 R)
- M40: 13,247,939 km (0.1 R)
- M41: 13,340,241 km (0.101 R)
- M42: 13,991,590 km (0.115 R)
- M43: 14,132,660 km (0.114 R)
- M44: 14,321,303 km (0.097 R)
- M45: 15,180,594 km (0.1 R)
- M46: 16,948,691 km (0.069 R)
- M47: 17,199,267 km (0.063 R)
- M48: 18,265,601 km (0.11 R)
- M49: 18,368,225 km (0.075 R)
- M50: 19,196,399 km (0.093 R)
- M51: 19,300,818 km (0.075 R)
- M52: 20,461,398 km (0.054 R)
- M53: 21,590,264 km (0.095 R)
- M54: 22,408,863 km (0.12 R)
- M55: 23,683,736 km (0.034 R)
- M56: 23,907,834 km (0.05 R)
- M57: 24,076,431 km (0.057 R)
- M58: 24,132,680 km (0.108 R)
- M59: 24,641,163 km (0.083 R)
- M60: 25,153,087 km (0.059 R)
- M61: 25,553,710 km (0.03 R)
- M62: 25,611,006 km (0.047 R)
- M63: 26,187,406 km (0.043 R)
- M64: 26,361,239 km (0.066 R)
- M65: 26,477,178 km (0.06 R)
- M66: 26,767,996 km (0.083 R)
- M67: 28,060,372 km (0.097 R)
- M68: 28,297,484 km (0.114 R)
- M69: 28,594,885 km (0.049 R)
- M70: 28,714,114 km (0.11 R)
- M71: 29,794,660 km (0.115 R)
- M72: 29,855,097 km (0.079 R)
- M73: 31,010,891 km (0.078 R)
- M74: 31,256,082 km (0.067 R)
- M75: 32,616,076 km (0.092 R)
- M76: 32,927,838 km (0.112 R)
- M77: 34,248,039 km (0.116 R)
- M78: 34,374,599 km (0.07 R)
- M79: 36,292,892 km (0.028 R)
- M80: 36,680,650 km (0.047 R)
- M81: 36,745,426 km (0.064 R)
- M82: 37,330,054 km (0.071 R)
- M83: 37,983,199 km (0.076 R)
- M84: 38,640,083 km (0.078 R)
- M85: 39,832,079 km (0.095 R)
- M86: 40,901,703 km (0.103 R)
- M87: 41,709,981 km (0.115 R)
- M88: 41,845,217 km (0.109 R)
- M89: 43,753,936 km (0.088 R)
- M90: 43,960,232 km (0.113 R)
- M91: 45,203,989 km (0.113 R)
- M92: 46,880,532 km (0.096 R)
Kuiper Belt
Range: 30 - 45 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 493 - 14,726 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.