Star System Generated (Seed: 1766813760)
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 (8 Planets)
Planet 1 - Gas Giant
Semi-Major Axis: 0.59 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 559.4
Radius: 14
Gravity: 2.85 G
Time & Orbit
Eccentricity (e): 0.017
Orbit Range: 0.58 AU - 0.6 AU
Year: 302 Days
Day: 14.3 Hours
Environment
Temp: -149 °C
Axial Tilt: 35.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (32)
Outer Limit: 16,664,679 km
- M1: 178,919 km (0.115 R)
- M2: 268,528 km (0.109 R)
- M3: 433,684 km (0.098 R)
- M4: 544,536 km (0.092 R)
- M5: 637,437 km (0.094 R)
- M6: 759,508 km (0.112 R)
- M7: 876,943 km (0.103 R)
- M8: 965,205 km (0.116 R)
- M9: 1,117,047 km (0.037 R)
- M10: 1,237,623 km (0.092 R)
- M11: 1,330,224 km (0.071 R)
- M12: 1,446,312 km (0.067 R)
- M13: 1,627,326 km (0.1 R)
- M14: 1,743,264 km (0.105 R)
- M15: 1,885,382 km (0.084 R)
- M16: 1,983,967 km (0.073 R)
- M17: 2,089,284 km (0.106 R)
- M18: 2,270,596 km (0.073 R)
- M19: 2,370,977 km (0.119 R)
- M20: 2,539,873 km (0.069 R)
- M21: 2,628,435 km (0.107 R)
- M22: 2,819,621 km (0.107 R)
- M23: 2,917,009 km (0.112 R)
- M24: 3,010,059 km (0.108 R)
- M25: 3,098,621 km (0.115 R)
- M26: 3,187,931 km (0.102 R)
- M27: 3,318,081 km (0.062 R)
- M28: 3,507,920 km (0.11 R)
- M29: 3,790,511 km (0.099 R)
- M30: 3,880,419 km (0.044 R)
- M31: 4,092,998 km (0.113 R)
- M32: 4,234,817 km (0.096 R)
Planet 2 - Gas Giant
Semi-Major Axis: 0.63 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 840.6
Radius: 9.4
Gravity: 9.51 G
Time & Orbit
Eccentricity (e): 0.163
Orbit Range: 0.53 AU - 0.73 AU
Year: 333 Days
Day: 14 Hours
Environment
Temp: -150 °C
Axial Tilt: 9.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (50)
Outer Limit: 16,664,679 km
- M1: 137,480 km (0.113 R)
- M2: 199,115 km (0.09 R)
- M3: 283,787 km (0.1 R)
- M4: 360,680 km (0.094 R)
- M5: 478,115 km (0.114 R)
- M6: 675,584 km (0.092 R)
- M7: 814,261 km (0.119 R)
- M8: 874,998 km (0.092 R)
- M9: 967,001 km (0.107 R)
- M10: 1,147,715 km (0.111 R)
- M11: 1,258,716 km (0.082 R)
- M12: 1,373,608 km (0.097 R)
- M13: 1,442,123 km (0.118 R)
- M14: 1,603,540 km (0.065 R)
- M15: 1,733,839 km (0.086 R)
- M16: 1,802,954 km (0.094 R)
- M17: 1,884,036 km (0.047 R)
- M18: 1,999,525 km (0.107 R)
- M19: 2,111,873 km (0.112 R)
- M20: 2,197,443 km (0.101 R)
- M21: 2,266,707 km (0.092 R)
- M22: 2,336,868 km (0.111 R)
- M23: 2,419,596 km (0.066 R)
- M24: 2,545,557 km (0.048 R)
- M25: 2,704,580 km (0.039 R)
- M26: 2,766,663 km (0.048 R)
- M27: 2,848,044 km (0.096 R)
- M28: 2,936,606 km (0.095 R)
- M29: 3,045,364 km (0.045 R)
- M30: 3,201,394 km (0.061 R)
- M31: 3,260,486 km (0.106 R)
- M32: 3,346,654 km (0.102 R)
- M33: 3,420,107 km (0.115 R)
- M34: 3,541,580 km (0.101 R)
- M35: 3,671,281 km (0.077 R)
- M36: 3,761,040 km (0.103 R)
- M37: 3,823,422 km (0.036 R)
- M38: 3,935,471 km (0.104 R)
- M39: 4,034,505 km (0.114 R)
- M40: 4,155,679 km (0.087 R)
- M41: 4,314,552 km (0.118 R)
- M42: 4,409,248 km (0.102 R)
- M43: 4,497,361 km (0.111 R)
- M44: 4,615,693 km (0.108 R)
- M45: 4,675,382 km (0.114 R)
- M46: 4,863,128 km (0.107 R)
- M47: 4,977,121 km (0.103 R)
- M48: 5,068,974 km (0.055 R)
- M49: 5,130,459 km (0.07 R)
- M50: 5,238,768 km (0.084 R)
Planet 3 - Gas Giant
Semi-Major Axis: 0.66 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 417.6
Radius: 12.3
Gravity: 2.76 G
Time & Orbit
Eccentricity (e): 0.099
Orbit Range: 0.59 AU - 0.73 AU
Year: 358 Days
Day: 11.6 Hours
Environment
Temp: -149 °C
Axial Tilt: 37.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (37)
Outer Limit: 16,664,679 km
- M1: 170,841 km (0.069 R)
- M2: 247,584 km (0.106 R)
- M3: 341,083 km (0.107 R)
- M4: 459,415 km (0.084 R)
- M5: 568,622 km (0.072 R)
- M6: 650,452 km (0.049 R)
- M7: 743,801 km (0.096 R)
- M8: 835,205 km (0.095 R)
- M9: 1,049,878 km (0.094 R)
- M10: 1,126,921 km (0.105 R)
- M11: 1,242,410 km (0.098 R)
- M12: 1,328,579 km (0.108 R)
- M13: 1,446,911 km (0.111 R)
- M14: 1,613,563 km (0.098 R)
- M15: 1,754,334 km (0.101 R)
- M16: 1,923,081 km (0.116 R)
- M17: 2,033,933 km (0.111 R)
- M18: 2,166,776 km (0.112 R)
- M19: 2,363,946 km (0.115 R)
- M20: 2,509,205 km (0.057 R)
- M21: 2,625,443 km (0.045 R)
- M22: 2,836,226 km (0.118 R)
- M23: 2,940,945 km (0.025 R)
- M24: 3,018,885 km (0.117 R)
- M25: 3,103,258 km (0.082 R)
- M26: 3,205,583 km (0.095 R)
- M27: 3,326,458 km (0.066 R)
- M28: 3,431,177 km (0.088 R)
- M29: 3,525,423 km (0.045 R)
- M30: 3,602,466 km (0.079 R)
- M31: 3,686,092 km (0.08 R)
- M32: 3,776,598 km (0.117 R)
- M33: 3,965,840 km (0.081 R)
- M34: 4,120,823 km (0.095 R)
- M35: 4,221,054 km (0.097 R)
- M36: 4,315,749 km (0.029 R)
- M37: 4,411,192 km (0.106 R)
Planet 4 - Gas Giant
Semi-Major Axis: 0.93 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 535.1
Radius: 9.9
Gravity: 5.46 G
Time & Orbit
Eccentricity (e): 0.076
Orbit Range: 0.86 AU - 1 AU
Year: 598 Days
Day: 14.1 Hours
Environment
Temp: -167 °C
Axial Tilt: 10 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (51)
Outer Limit: 16,664,679 km
- M1: 137,780 km (0.099 R)
- M2: 204,051 km (0.094 R)
- M3: 273,166 km (0.063 R)
- M4: 338,989 km (0.1 R)
- M5: 409,001 km (0.119 R)
- M6: 504,294 km (0.067 R)
- M7: 608,415 km (0.115 R)
- M8: 751,879 km (0.064 R)
- M9: 907,311 km (0.098 R)
- M10: 1,022,202 km (0.117 R)
- M11: 1,094,608 km (0.063 R)
- M12: 1,158,187 km (0.043 R)
- M13: 1,228,647 km (0.11 R)
- M14: 1,356,853 km (0.096 R)
- M15: 1,448,706 km (0.036 R)
- M16: 1,590,674 km (0.04 R)
- M17: 1,688,062 km (0.117 R)
- M18: 1,774,829 km (0.068 R)
- M19: 1,837,810 km (0.081 R)
- M20: 1,914,404 km (0.071 R)
- M21: 1,979,030 km (0.111 R)
- M22: 2,044,405 km (0.109 R)
- M23: 2,480,632 km (0.112 R)
- M24: 2,558,572 km (0.105 R)
- M25: 2,644,442 km (0.093 R)
- M26: 2,789,851 km (0.107 R)
- M27: 2,871,082 km (0.084 R)
- M28: 2,968,022 km (0.042 R)
- M29: 3,119,265 km (0.112 R)
- M30: 3,335,434 km (0.082 R)
- M31: 3,413,823 km (0.047 R)
- M32: 3,484,882 km (0.029 R)
- M33: 3,580,625 km (0.072 R)
- M34: 3,685,044 km (0.051 R)
- M35: 3,790,660 km (0.04 R)
- M36: 4,013,262 km (0.11 R)
- M37: 4,155,679 km (0.057 R)
- M38: 4,282,688 km (0.098 R)
- M39: 4,445,450 km (0.026 R)
- M40: 4,636,487 km (0.07 R)
- M41: 4,910,401 km (0.118 R)
- M42: 4,981,908 km (0.046 R)
- M43: 5,116,995 km (0.077 R)
- M44: 5,280,655 km (0.109 R)
- M45: 5,409,309 km (0.043 R)
- M46: 5,991,096 km (0.12 R)
- M47: 6,057,966 km (0.116 R)
- M48: 6,163,731 km (0.075 R)
- M49: 6,289,543 km (0.113 R)
- M50: 6,484,619 km (0.102 R)
- M51: 6,622,399 km (0.11 R)
Planet 5 - Gas Giant
Semi-Major Axis: 1.59 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 272.2
Radius: 12.3
Gravity: 1.8 G
Time & Orbit
Eccentricity (e): 0.075
Orbit Range: 1.47 AU - 1.71 AU
Year: 1337 Days
Day: 9.1 Hours
Environment
Temp: -203 °C
Axial Tilt: 21.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (51)
Outer Limit: 16,664,679 km
- M1: 248,183 km (0.096 R)
- M2: 335,398 km (0.082 R)
- M3: 414,087 km (0.112 R)
- M4: 492,626 km (0.047 R)
- M5: 577,747 km (0.055 R)
- M6: 668,852 km (0.088 R)
- M7: 749,186 km (0.076 R)
- M8: 945,309 km (0.06 R)
- M9: 1,043,744 km (0.118 R)
- M10: 1,126,472 km (0.074 R)
- M11: 1,245,103 km (0.081 R)
- M12: 1,502,711 km (0.104 R)
- M13: 1,590,076 km (0.102 R)
- M14: 1,800,859 km (0.118 R)
- M15: 1,925,624 km (0.114 R)
- M16: 2,053,380 km (0.07 R)
- M17: 2,267,156 km (0.1 R)
- M18: 2,402,392 km (0.088 R)
- M19: 2,479,734 km (0.075 R)
- M20: 2,636,962 km (0.072 R)
- M21: 3,100,565 km (0.113 R)
- M22: 3,213,512 km (0.118 R)
- M23: 3,443,444 km (0.107 R)
- M24: 3,580,176 km (0.06 R)
- M25: 4,021,490 km (0.091 R)
- M26: 4,145,058 km (0.093 R)
- M27: 4,259,351 km (0.086 R)
- M28: 4,480,456 km (0.108 R)
- M29: 4,770,526 km (0.07 R)
- M30: 5,022,449 km (0.086 R)
- M31: 5,111,161 km (0.035 R)
- M32: 5,189,101 km (0.067 R)
- M33: 5,267,491 km (0.071 R)
- M34: 5,436,985 km (0.099 R)
- M35: 5,723,315 km (0.094 R)
- M36: 5,839,403 km (0.06 R)
- M37: 5,944,421 km (0.087 R)
- M38: 6,311,085 km (0.048 R)
- M39: 6,454,999 km (0.12 R)
- M40: 6,992,204 km (0.085 R)
- M41: 7,203,736 km (0.104 R)
- M42: 7,379,513 km (0.096 R)
- M43: 7,493,208 km (0.112 R)
- M44: 7,722,392 km (0.084 R)
- M45: 7,799,285 km (0.113 R)
- M46: 7,953,969 km (0.091 R)
- M47: 8,148,746 km (0.099 R)
- M48: 8,305,674 km (0.117 R)
- M49: 8,862,926 km (0.103 R)
- M50: 8,970,487 km (0.116 R)
- M51: 9,132,651 km (0.046 R)
Planet 6 - Gas Giant
Semi-Major Axis: 3.39 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 744
Radius: 14
Gravity: 3.8 G
Time & Orbit
Eccentricity (e): 0.147
Orbit Range: 2.89 AU - 3.89 AU
Year: 4162 Days
Day: 7 Hours
Environment
Temp: -213 °C
Axial Tilt: 161 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (71)
Outer Limit: 16,664,679 km
- M1: 210,035 km (0.066 R)
- M2: 400,623 km (0.106 R)
- M3: 555,307 km (0.094 R)
- M4: 723,455 km (0.087 R)
- M5: 1,280,408 km (0.081 R)
- M6: 1,409,362 km (0.057 R)
- M7: 1,497,923 km (0.11 R)
- M8: 1,603,839 km (0.033 R)
- M9: 1,728,155 km (0.06 R)
- M10: 1,970,204 km (0.081 R)
- M11: 2,310,689 km (0.09 R)
- M12: 2,524,314 km (0.11 R)
- M13: 3,106,400 km (0.106 R)
- M14: 3,263,478 km (0.112 R)
- M15: 3,688,635 km (0.11 R)
- M16: 3,813,399 km (0.09 R)
- M17: 3,960,753 km (0.05 R)
- M18: 4,131,594 km (0.076 R)
- M19: 4,348,511 km (0.066 R)
- M20: 4,502,746 km (0.1 R)
- M21: 4,748,835 km (0.076 R)
- M22: 5,022,300 km (0.043 R)
- M23: 5,537,365 km (0.07 R)
- M24: 5,704,765 km (0.087 R)
- M25: 6,217,437 km (0.078 R)
- M26: 6,694,056 km (0.113 R)
- M27: 6,821,513 km (0.059 R)
- M28: 7,418,110 km (0.037 R)
- M29: 8,167,146 km (0.09 R)
- M30: 9,421,225 km (0.102 R)
- M31: 9,823,643 km (0.12 R)
- M32: 10,556,374 km (0.056 R)
- M33: 10,824,453 km (0.072 R)
- M34: 11,185,433 km (0.071 R)
- M35: 11,337,125 km (0.065 R)
- M36: 11,458,898 km (0.102 R)
- M37: 11,795,942 km (0.075 R)
- M38: 11,981,293 km (0.094 R)
- M39: 12,417,371 km (0.113 R)
- M40: 12,795,405 km (0.105 R)
- M41: 12,922,264 km (0.1 R)
- M42: 13,241,207 km (0.05 R)
- M43: 13,433,889 km (0.025 R)
- M44: 13,724,557 km (0.033 R)
- M45: 13,984,708 km (0.065 R)
- M46: 14,642,340 km (0.086 R)
- M47: 15,142,147 km (0.108 R)
- M48: 15,309,996 km (0.09 R)
- M49: 15,410,974 km (0.101 R)
- M50: 15,546,061 km (0.107 R)
- M51: 16,295,846 km (0.092 R)
- M52: 16,571,405 km (0.103 R)
- M53: 16,918,023 km (0.084 R)
- M54: 17,512,824 km (0.101 R)
- M55: 17,759,810 km (0.109 R)
- M56: 18,400,089 km (0.114 R)
- M57: 20,812,205 km (0.033 R)
- M58: 21,449,492 km (0.066 R)
- M59: 21,638,135 km (0.083 R)
- M60: 22,017,067 km (0.039 R)
- M61: 22,207,505 km (0.087 R)
- M62: 22,360,095 km (0.08 R)
- M63: 22,666,471 km (0.099 R)
- M64: 23,593,978 km (0.116 R)
- M65: 23,749,709 km (0.04 R)
- M66: 23,983,979 km (0.059 R)
- M67: 25,685,805 km (0.07 R)
- M68: 25,926,358 km (0.1 R)
- M69: 26,369,317 km (0.115 R)
- M70: 26,855,361 km (0.082 R)
- M71: 27,467,216 km (0.086 R)
Planet 7 - Gas Giant
Semi-Major Axis: 4.47 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 638.6
Radius: 13.9
Gravity: 3.31 G
Time & Orbit
Eccentricity (e): 0.043
Orbit Range: 4.28 AU - 4.66 AU
Year: 6302 Days
Day: 13.9 Hours
Environment
Temp: -230 °C
Axial Tilt: 25.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (78)
Outer Limit: 16,664,679 km
- M1: 324,777 km (0.029 R)
- M2: 426,504 km (0.111 R)
- M3: 521,797 km (0.095 R)
- M4: 651,200 km (0.083 R)
- M5: 1,006,644 km (0.09 R)
- M6: 1,239,568 km (0.115 R)
- M7: 1,422,227 km (0.067 R)
- M8: 1,561,054 km (0.114 R)
- M9: 1,650,214 km (0.108 R)
- M10: 1,759,570 km (0.074 R)
- M11: 1,928,466 km (0.12 R)
- M12: 2,788,205 km (0.12 R)
- M13: 3,121,808 km (0.086 R)
- M14: 3,213,063 km (0.103 R)
- M15: 3,468,576 km (0.106 R)
- M16: 3,586,908 km (0.09 R)
- M17: 5,604,385 km (0.119 R)
- M18: 5,743,960 km (0.076 R)
- M19: 6,227,460 km (0.095 R)
- M20: 6,401,293 km (0.063 R)
- M21: 6,932,515 km (0.111 R)
- M22: 7,508,616 km (0.117 R)
- M23: 7,974,464 km (0.1 R)
- M24: 8,195,121 km (0.085 R)
- M25: 9,065,182 km (0.058 R)
- M26: 9,196,529 km (0.063 R)
- M27: 9,461,317 km (0.074 R)
- M28: 10,787,802 km (0.118 R)
- M29: 10,962,083 km (0.071 R)
- M30: 11,243,028 km (0.103 R)
- M31: 11,704,388 km (0.104 R)
- M32: 12,135,978 km (0.111 R)
- M33: 12,462,999 km (0.086 R)
- M34: 12,682,758 km (0.079 R)
- M35: 12,903,714 km (0.083 R)
- M36: 13,237,616 km (0.098 R)
- M37: 14,794,481 km (0.092 R)
- M38: 15,143,942 km (0.107 R)
- M39: 15,930,378 km (0.115 R)
- M40: 16,328,757 km (0.103 R)
- M41: 16,609,403 km (0.117 R)
- M42: 17,094,399 km (0.048 R)
- M43: 17,338,692 km (0.044 R)
- M44: 18,744,613 km (0.071 R)
- M45: 19,080,760 km (0.104 R)
- M46: 19,461,337 km (0.044 R)
- M47: 19,844,307 km (0.091 R)
- M48: 20,186,886 km (0.089 R)
- M49: 20,834,645 km (0.119 R)
- M50: 21,182,909 km (0.101 R)
- M51: 21,532,968 km (0.102 R)
- M52: 21,840,990 km (0.08 R)
- M53: 21,929,253 km (0.102 R)
- M54: 22,729,003 km (0.046 R)
- M55: 22,863,192 km (0.082 R)
- M56: 23,764,669 km (0.112 R)
- M57: 24,083,013 km (0.08 R)
- M58: 25,185,101 km (0.088 R)
- M59: 25,835,552 km (0.113 R)
- M60: 26,115,899 km (0.091 R)
- M61: 26,538,513 km (0.036 R)
- M62: 26,774,279 km (0.088 R)
- M63: 27,010,793 km (0.087 R)
- M64: 27,438,194 km (0.058 R)
- M65: 28,444,090 km (0.06 R)
- M66: 29,267,178 km (0.084 R)
- M67: 29,950,990 km (0.09 R)
- M68: 30,049,126 km (0.101 R)
- M69: 30,590,670 km (0.095 R)
- M70: 30,738,922 km (0.036 R)
- M71: 31,433,953 km (0.07 R)
- M72: 31,733,448 km (0.118 R)
- M73: 31,883,495 km (0.063 R)
- M74: 32,486,225 km (0.118 R)
- M75: 32,587,054 km (0.118 R)
- M76: 32,839,575 km (0.079 R)
- M77: 33,856,093 km (0.033 R)
- M78: 34,317,004 km (0.082 R)
Planet 8 - Gas Giant
Semi-Major Axis: 4.79 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 58.9
Radius: 13.1
Gravity: 0.34 G
Time & Orbit
Eccentricity (e): 0.037
Orbit Range: 4.61 AU - 4.97 AU
Year: 6991 Days
Day: 12.6 Hours
Environment
Temp: -214 °C
Axial Tilt: 28.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (34)
Outer Limit: 16,664,679 km
- M1: 206,146 km (0.108 R)
- M2: 299,944 km (0.074 R)
- M3: 436,377 km (0.063 R)
- M4: 1,027,289 km (0.117 R)
- M5: 1,278,912 km (0.094 R)
- M6: 2,503,820 km (0.073 R)
- M7: 2,887,987 km (0.078 R)
- M8: 3,276,941 km (0.074 R)
- M9: 3,405,596 km (0.105 R)
- M10: 3,609,198 km (0.06 R)
- M11: 5,094,555 km (0.049 R)
- M12: 5,702,222 km (0.095 R)
- M13: 6,014,732 km (0.038 R)
- M14: 6,584,251 km (0.08 R)
- M15: 6,912,170 km (0.109 R)
- M16: 7,115,324 km (0.068 R)
- M17: 7,208,373 km (0.087 R)
- M18: 7,832,197 km (0.103 R)
- M19: 7,928,238 km (0.112 R)
- M20: 9,744,656 km (0.116 R)
- M21: 10,307,592 km (0.08 R)
- M22: 10,434,152 km (0.077 R)
- M23: 10,731,403 km (0.062 R)
- M24: 12,326,565 km (0.089 R)
- M25: 13,026,235 km (0.104 R)
- M26: 13,948,206 km (0.076 R)
- M27: 14,322,799 km (0.109 R)
- M28: 14,795,828 km (0.058 R)
- M29: 14,962,629 km (0.098 R)
- M30: 15,418,604 km (0.088 R)
- M31: 15,539,180 km (0.105 R)
- M32: 15,708,824 km (0.07 R)
- M33: 16,000,839 km (0.045 R)
- M34: 16,147,594 km (0.05 R)
Kuiper Belt
Range: 30 - 50 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 440 - 14,861 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.