Star System Generated (Seed: 1767193338)
Star Details
Spectral Class: M3V
Temperature: 3,267 K
Mass: 0.31 sol
Luminosity: 0.02 lux
Habitable Zone (HZ)
Inner Boundary: 0.13 AU
Outer Boundary: 0.19 AU
Physical Limits
Snow Line: 0.68 AU
Max System Radius: 11.1 AU
Planetary System (6 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 0.65 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 2.45
Radius: 1.43
Gravity: 1.2 G
Time & Orbit
Eccentricity (e): 0.063
Orbit Range: 0.61 AU - 0.69 AU
Year: 344 Days
Day: 47.9 Hours
Environment
Temp: -130 °C
Axial Tilt: 63.9 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Satellites (2)
Outer Limit: 82,486,006 km
- M1: 465,848 km (0.092 R)
- M2: 714,629 km (0.076 R)
Planet 2 - Gas Giant
Semi-Major Axis: 2.28 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 401.5
Radius: 13.2
Gravity: 2.3 G
Time & Orbit
Eccentricity (e): 0.18
Orbit Range: 1.87 AU - 2.69 AU
Year: 2258 Days
Day: 10.2 Hours
Environment
Temp: -203 °C
Axial Tilt: 8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (68)
Outer Limit: 82,486,006 km
- M1: 169,345 km (0.12 R)
- M2: 295,306 km (0.114 R)
- M3: 402,418 km (0.04 R)
- M4: 594,951 km (0.092 R)
- M5: 686,355 km (0.09 R)
- M6: 1,018,911 km (0.077 R)
- M7: 1,159,234 km (0.078 R)
- M8: 1,334,862 km (0.109 R)
- M9: 1,489,995 km (0.081 R)
- M10: 1,672,055 km (0.111 R)
- M11: 1,776,475 km (0.065 R)
- M12: 1,883,138 km (0.028 R)
- M13: 2,297,524 km (0.087 R)
- M14: 2,557,525 km (0.099 R)
- M15: 2,839,966 km (0.093 R)
- M16: 2,991,359 km (0.072 R)
- M17: 3,171,475 km (0.034 R)
- M18: 3,395,124 km (0.057 R)
- M19: 3,556,241 km (0.073 R)
- M20: 3,651,385 km (0.115 R)
- M21: 3,928,141 km (0.088 R)
- M22: 4,054,850 km (0.067 R)
- M23: 4,341,629 km (0.1 R)
- M24: 4,620,181 km (0.103 R)
- M25: 5,303,544 km (0.055 R)
- M26: 5,428,308 km (0.058 R)
- M27: 5,840,899 km (0.102 R)
- M28: 6,018,622 km (0.109 R)
- M29: 6,165,227 km (0.103 R)
- M30: 6,247,357 km (0.105 R)
- M31: 6,329,636 km (0.091 R)
- M32: 6,428,968 km (0.103 R)
- M33: 6,629,280 km (0.12 R)
- M34: 6,730,259 km (0.091 R)
- M35: 6,950,766 km (0.12 R)
- M36: 7,294,542 km (0.114 R)
- M37: 7,416,314 km (0.038 R)
- M38: 7,538,685 km (0.034 R)
- M39: 7,626,499 km (0.114 R)
- M40: 7,838,629 km (0.099 R)
- M41: 7,945,442 km (0.12 R)
- M42: 8,250,921 km (0.06 R)
- M43: 8,596,791 km (0.102 R)
- M44: 8,762,246 km (0.091 R)
- M45: 9,040,499 km (0.109 R)
- M46: 9,359,441 km (0.11 R)
- M47: 9,453,837 km (0.105 R)
- M48: 9,681,974 km (0.093 R)
- M49: 10,221,424 km (0.082 R)
- M50: 10,338,260 km (0.109 R)
- M51: 10,612,772 km (0.047 R)
- M52: 10,829,988 km (0.117 R)
- M53: 10,989,011 km (0.108 R)
- M54: 11,289,254 km (0.06 R)
- M55: 11,450,520 km (0.107 R)
- M56: 11,693,766 km (0.097 R)
- M57: 11,816,137 km (0.116 R)
- M58: 11,938,808 km (0.11 R)
- M59: 12,164,850 km (0.103 R)
- M60: 12,268,222 km (0.036 R)
- M61: 12,475,565 km (0.082 R)
- M62: 13,423,118 km (0.091 R)
- M63: 13,658,286 km (0.113 R)
- M64: 13,851,716 km (0.1 R)
- M65: 14,241,418 km (0.039 R)
- M66: 14,372,017 km (0.1 R)
- M67: 14,722,525 km (0.06 R)
- M68: 14,854,620 km (0.115 R)
Planet 3 - Gas Giant
Semi-Major Axis: 2.42 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 910.6
Radius: 12.3
Gravity: 6.02 G
Time & Orbit
Eccentricity (e): 0.032
Orbit Range: 2.34 AU - 2.5 AU
Year: 2470 Days
Day: 13.8 Hours
Environment
Temp: -194 °C
Axial Tilt: 12.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (73)
Outer Limit: 82,486,006 km
- M1: 153,637 km (0.109 R)
- M2: 287,826 km (0.106 R)
- M3: 390,151 km (0.097 R)
- M4: 502,200 km (0.117 R)
- M5: 672,293 km (0.097 R)
- M6: 775,067 km (0.113 R)
- M7: 893,997 km (0.081 R)
- M8: 1,063,042 km (0.093 R)
- M9: 1,231,639 km (0.026 R)
- M10: 1,397,543 km (0.118 R)
- M11: 1,660,536 km (0.083 R)
- M12: 1,765,105 km (0.091 R)
- M13: 1,953,599 km (0.109 R)
- M14: 2,134,762 km (0.103 R)
- M15: 2,321,609 km (0.107 R)
- M16: 2,409,723 km (0.12 R)
- M17: 2,696,202 km (0.063 R)
- M18: 2,978,194 km (0.093 R)
- M19: 3,335,733 km (0.087 R)
- M20: 3,724,538 km (0.066 R)
- M21: 3,828,359 km (0.082 R)
- M22: 4,056,795 km (0.118 R)
- M23: 4,235,565 km (0.093 R)
- M24: 5,265,247 km (0.111 R)
- M25: 5,362,635 km (0.091 R)
- M26: 5,939,335 km (0.089 R)
- M27: 6,040,762 km (0.039 R)
- M28: 6,307,345 km (0.062 R)
- M29: 6,514,987 km (0.035 R)
- M30: 6,661,743 km (0.104 R)
- M31: 7,281,377 km (0.105 R)
- M32: 7,609,146 km (0.09 R)
- M33: 7,941,852 km (0.064 R)
- M34: 8,053,751 km (0.092 R)
- M35: 8,415,628 km (0.052 R)
- M36: 8,667,401 km (0.118 R)
- M37: 8,991,730 km (0.105 R)
- M38: 9,652,055 km (0.102 R)
- M39: 9,747,648 km (0.1 R)
- M40: 9,939,881 km (0.088 R)
- M41: 10,157,695 km (0.089 R)
- M42: 11,044,512 km (0.073 R)
- M43: 11,144,443 km (0.069 R)
- M44: 11,624,054 km (0.119 R)
- M45: 11,751,362 km (0.083 R)
- M46: 12,213,469 km (0.088 R)
- M47: 12,472,872 km (0.118 R)
- M48: 12,551,112 km (0.028 R)
- M49: 12,681,711 km (0.089 R)
- M50: 13,475,028 km (0.119 R)
- M51: 13,555,213 km (0.077 R)
- M52: 13,716,180 km (0.104 R)
- M53: 13,850,818 km (0.1 R)
- M54: 14,121,291 km (0.093 R)
- M55: 14,257,275 km (0.117 R)
- M56: 14,832,928 km (0.074 R)
- M57: 14,915,805 km (0.109 R)
- M58: 15,388,235 km (0.061 R)
- M59: 15,640,308 km (0.072 R)
- M60: 15,865,602 km (0.095 R)
- M61: 16,035,246 km (0.085 R)
- M62: 16,605,214 km (0.06 R)
- M63: 16,806,274 km (0.096 R)
- M64: 17,326,874 km (0.068 R)
- M65: 17,853,010 km (0.092 R)
- M66: 18,147,418 km (0.1 R)
- M67: 18,473,243 km (0.104 R)
- M68: 18,711,402 km (0.074 R)
- M69: 18,801,012 km (0.066 R)
- M70: 19,100,656 km (0.1 R)
- M71: 19,643,996 km (0.09 R)
- M72: 20,039,682 km (0.12 R)
- M73: 20,376,427 km (0.118 R)
Asteroid Belt
Center: 5.33 AU
Composition
Type: Outer System (Icy)
A dense region of planetesimals and debris.
Boundary
Planet 4 - Ice Giant
Semi-Major Axis: 8.24 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 581.5
Radius: 6.1
Gravity: 15.63 G
Time & Orbit
Eccentricity (e): 0.213
Orbit Range: 6.48 AU - 10 AU
Year: 15517 Days
Day: 23.9 Hours
Environment
Temp: -235 °C
Axial Tilt: 14.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (92)
Outer Limit: 82,486,006 km
- M1: 301,739 km (0.037 R)
- M2: 617,540 km (0.064 R)
- M3: 734,825 km (0.076 R)
- M4: 775,665 km (0.03 R)
- M5: 880,982 km (0.109 R)
- M6: 1,554,920 km (0.078 R)
- M7: 2,055,026 km (0.108 R)
- M8: 2,292,288 km (0.111 R)
- M9: 2,353,025 km (0.076 R)
- M10: 2,569,942 km (0.11 R)
- M11: 2,825,605 km (0.084 R)
- M12: 3,676,218 km (0.076 R)
- M13: 4,000,696 km (0.086 R)
- M14: 4,371,998 km (0.104 R)
- M15: 4,485,543 km (0.102 R)
- M16: 5,267,191 km (0.043 R)
- M17: 5,307,433 km (0.118 R)
- M18: 5,550,679 km (0.083 R)
- M19: 6,174,802 km (0.089 R)
- M20: 6,259,773 km (0.093 R)
- M21: 6,345,044 km (0.119 R)
- M22: 6,821,065 km (0.104 R)
- M23: 6,952,860 km (0.107 R)
- M24: 7,174,564 km (0.116 R)
- M25: 7,533,898 km (0.112 R)
- M26: 7,624,704 km (0.108 R)
- M27: 9,909,513 km (0.042 R)
- M28: 10,259,123 km (0.106 R)
- M29: 10,309,388 km (0.069 R)
- M30: 11,022,072 km (0.095 R)
- M31: 12,333,746 km (0.111 R)
- M32: 12,387,302 km (0.084 R)
- M33: 12,655,830 km (0.068 R)
- M34: 13,089,664 km (0.03 R)
- M35: 13,638,688 km (0.076 R)
- M36: 13,804,892 km (0.082 R)
- M37: 14,759,176 km (0.098 R)
- M38: 15,445,681 km (0.084 R)
- M39: 16,730,876 km (0.104 R)
- M40: 17,626,818 km (0.068 R)
- M41: 18,293,576 km (0.111 R)
- M42: 18,783,808 km (0.095 R)
- M43: 18,968,711 km (0.118 R)
- M44: 19,278,229 km (0.04 R)
- M45: 21,362,726 km (0.118 R)
- M46: 21,491,380 km (0.052 R)
- M47: 21,814,062 km (0.036 R)
- M48: 22,073,315 km (0.09 R)
- M49: 22,268,541 km (0.091 R)
- M50: 23,120,800 km (0.114 R)
- M51: 26,842,645 km (0.073 R)
- M52: 27,259,724 km (0.087 R)
- M53: 27,469,161 km (0.112 R)
- M54: 27,749,208 km (0.088 R)
- M55: 29,091,999 km (0.069 R)
- M56: 29,448,939 km (0.115 R)
- M57: 29,735,419 km (0.099 R)
- M58: 30,673,248 km (0.101 R)
- M59: 31,401,042 km (0.119 R)
- M60: 33,171,233 km (0.108 R)
- M61: 33,320,233 km (0.115 R)
- M62: 33,843,227 km (0.114 R)
- M63: 34,143,470 km (0.091 R)
- M64: 34,897,742 km (0.103 R)
- M65: 34,973,439 km (0.063 R)
- M66: 35,809,990 km (0.052 R)
- M67: 37,580,481 km (0.1 R)
- M68: 38,437,228 km (0.088 R)
- M69: 40,408,330 km (0.082 R)
- M70: 43,956,342 km (0.086 R)
- M71: 45,023,574 km (0.117 R)
- M72: 45,106,002 km (0.031 R)
- M73: 45,271,158 km (0.06 R)
- M74: 45,684,647 km (0.059 R)
- M75: 46,182,508 km (0.049 R)
- M76: 46,432,038 km (0.056 R)
- M77: 47,602,790 km (0.102 R)
- M78: 49,207,078 km (0.095 R)
- M79: 49,377,021 km (0.093 R)
- M80: 51,431,000 km (0.038 R)
- M81: 53,600,169 km (0.06 R)
- M82: 53,862,564 km (0.079 R)
- M83: 54,212,922 km (0.117 R)
- M84: 54,476,214 km (0.096 R)
- M85: 54,651,992 km (0.097 R)
- M86: 56,954,004 km (0.067 R)
- M87: 57,221,784 km (0.094 R)
- M88: 57,400,404 km (0.094 R)
- M89: 58,027,219 km (0.054 R)
- M90: 58,296,495 km (0.091 R)
- M91: 59,016,809 km (0.086 R)
- M92: 59,197,373 km (0.103 R)
Planet 5 - Ice Giant
Semi-Major Axis: 9.33 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 833
Radius: 3.9
Gravity: 54.77 G
Time & Orbit
Eccentricity (e): 0.148
Orbit Range: 7.95 AU - 10.71 AU
Year: 18695 Days
Day: 18.6 Hours
Environment
Temp: -228 °C
Axial Tilt: 39.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (93)
Outer Limit: 82,486,006 km
- M1: 114,742 km (0.073 R)
- M2: 301,739 km (0.106 R)
- M3: 646,113 km (0.107 R)
- M4: 814,112 km (0.11 R)
- M5: 1,076,805 km (0.116 R)
- M6: 1,132,306 km (0.074 R)
- M7: 1,246,449 km (0.093 R)
- M8: 1,275,471 km (0.053 R)
- M9: 2,613,475 km (0.096 R)
- M10: 3,395,722 km (0.111 R)
- M11: 3,560,429 km (0.101 R)
- M12: 3,983,193 km (0.093 R)
- M13: 4,113,193 km (0.105 R)
- M14: 4,829,468 km (0.095 R)
- M15: 5,061,195 km (0.114 R)
- M16: 5,108,019 km (0.115 R)
- M17: 5,680,381 km (0.111 R)
- M18: 5,826,687 km (0.092 R)
- M19: 6,678,797 km (0.096 R)
- M20: 6,884,943 km (0.095 R)
- M21: 7,145,542 km (0.042 R)
- M22: 7,198,051 km (0.103 R)
- M23: 7,356,326 km (0.105 R)
- M24: 7,569,203 km (0.097 R)
- M25: 8,055,546 km (0.107 R)
- M26: 8,330,058 km (0.066 R)
- M27: 9,114,849 km (0.1 R)
- M28: 9,228,842 km (0.096 R)
- M29: 9,343,434 km (0.118 R)
- M30: 9,981,619 km (0.067 R)
- M31: 11,606,850 km (0.096 R)
- M32: 11,854,434 km (0.12 R)
- M33: 12,103,964 km (0.096 R)
- M34: 12,798,696 km (0.071 R)
- M35: 13,897,642 km (0.091 R)
- M36: 14,028,989 km (0.102 R)
- M37: 15,161,295 km (0.12 R)
- M38: 16,530,565 km (0.047 R)
- M39: 17,867,371 km (0.077 R)
- M40: 18,081,745 km (0.036 R)
- M41: 18,153,253 km (0.107 R)
- M42: 18,225,060 km (0.085 R)
- M43: 19,019,873 km (0.092 R)
- M44: 20,643,459 km (0.102 R)
- M45: 20,868,155 km (0.101 R)
- M46: 22,157,389 km (0.036 R)
- M47: 22,387,471 km (0.071 R)
- M48: 22,541,407 km (0.065 R)
- M49: 23,785,164 km (0.072 R)
- M50: 24,415,270 km (0.108 R)
- M51: 24,891,440 km (0.034 R)
- M52: 24,971,176 km (0.084 R)
- M53: 26,582,195 km (0.053 R)
- M54: 26,990,149 km (0.098 R)
- M55: 27,400,346 km (0.063 R)
- M56: 27,482,475 km (0.074 R)
- M57: 28,977,257 km (0.083 R)
- M58: 29,988,240 km (0.058 R)
- M59: 32,044,761 km (0.103 R)
- M60: 32,740,392 km (0.11 R)
- M61: 33,177,517 km (0.118 R)
- M62: 34,057,900 km (0.053 R)
- M63: 34,678,582 km (0.055 R)
- M64: 34,945,763 km (0.033 R)
- M65: 37,198,707 km (0.077 R)
- M66: 38,849,669 km (0.113 R)
- M67: 39,963,575 km (0.118 R)
- M68: 41,654,031 km (0.097 R)
- M69: 44,522,720 km (0.116 R)
- M70: 45,980,850 km (0.108 R)
- M71: 46,764,893 km (0.046 R)
- M72: 46,961,614 km (0.029 R)
- M73: 47,060,049 km (0.119 R)
- M74: 47,553,274 km (0.073 R)
- M75: 48,246,809 km (0.088 R)
- M76: 49,443,443 km (0.048 R)
- M77: 49,744,134 km (0.073 R)
- M78: 52,886,438 km (0.06 R)
- M79: 54,223,244 km (0.104 R)
- M80: 56,615,464 km (0.084 R)
- M81: 59,893,602 km (0.041 R)
- M82: 60,535,227 km (0.045 R)
- M83: 62,581,876 km (0.116 R)
- M84: 63,668,106 km (0.092 R)
- M85: 65,309,194 km (0.072 R)
- M86: 66,742,641 km (0.116 R)
- M87: 68,521,061 km (0.059 R)
- M88: 68,968,059 km (0.079 R)
- M89: 69,079,958 km (0.112 R)
- M90: 70,653,130 km (0.115 R)
- M91: 72,124,425 km (0.111 R)
- M92: 73,834,627 km (0.087 R)
- M93: 77,062,501 km (0.117 R)
Planet 6 - Ice Giant
Semi-Major Axis: 9.57 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 925.5
Radius: 5.2
Gravity: 34.23 G
Time & Orbit
Eccentricity (e): 0.164
Orbit Range: 8 AU - 11.14 AU
Year: 19421 Days
Day: 21.2 Hours
Environment
Temp: -232 °C
Axial Tilt: 22.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (95)
Outer Limit: 82,486,006 km
- M1: 67,319 km (0.109 R)
- M2: 297,849 km (0.057 R)
- M3: 581,337 km (0.104 R)
- M4: 724,054 km (0.036 R)
- M5: 1,127,818 km (0.058 R)
- M6: 1,186,311 km (0.042 R)
- M7: 1,399,189 km (0.104 R)
- M8: 1,526,197 km (0.088 R)
- M9: 1,964,669 km (0.084 R)
- M10: 2,327,294 km (0.096 R)
- M11: 4,475,071 km (0.105 R)
- M12: 4,568,569 km (0.025 R)
- M13: 5,639,092 km (0.114 R)
- M14: 5,841,797 km (0.088 R)
- M15: 6,464,124 km (0.093 R)
- M16: 6,569,890 km (0.116 R)
- M17: 7,827,110 km (0.117 R)
- M18: 8,396,330 km (0.094 R)
- M19: 8,744,145 km (0.084 R)
- M20: 9,156,138 km (0.116 R)
- M21: 9,215,378 km (0.075 R)
- M22: 9,574,264 km (0.099 R)
- M23: 9,755,427 km (0.083 R)
- M24: 10,740,379 km (0.113 R)
- M25: 10,991,704 km (0.087 R)
- M26: 11,563,915 km (0.115 R)
- M27: 11,692,420 km (0.118 R)
- M28: 12,737,212 km (0.109 R)
- M29: 12,936,326 km (0.091 R)
- M30: 13,003,047 km (0.049 R)
- M31: 13,405,166 km (0.04 R)
- M32: 13,607,871 km (0.101 R)
- M33: 14,084,640 km (0.064 R)
- M34: 14,844,896 km (0.108 R)
- M35: 15,265,116 km (0.116 R)
- M36: 16,189,033 km (0.108 R)
- M37: 16,477,009 km (0.093 R)
- M38: 16,549,264 km (0.12 R)
- M39: 16,912,039 km (0.042 R)
- M40: 17,277,507 km (0.11 R)
- M41: 17,498,014 km (0.101 R)
- M42: 18,840,655 km (0.093 R)
- M43: 19,067,595 km (0.115 R)
- M44: 19,371,727 km (0.083 R)
- M45: 20,061,673 km (0.112 R)
- M46: 21,229,284 km (0.098 R)
- M47: 21,465,499 km (0.104 R)
- M48: 22,418,887 km (0.07 R)
- M49: 22,820,258 km (0.071 R)
- M50: 29,204,945 km (0.096 R)
- M51: 30,792,627 km (0.06 R)
- M52: 30,881,638 km (0.085 R)
- M53: 30,970,798 km (0.12 R)
- M54: 31,866,590 km (0.087 R)
- M55: 31,956,648 km (0.107 R)
- M56: 32,770,910 km (0.101 R)
- M57: 33,043,776 km (0.074 R)
- M58: 33,135,031 km (0.113 R)
- M59: 35,347,434 km (0.099 R)
- M60: 38,466,400 km (0.08 R)
- M61: 40,010,100 km (0.091 R)
- M62: 40,789,505 km (0.078 R)
- M63: 41,475,561 km (0.077 R)
- M64: 44,257,932 km (0.097 R)
- M65: 44,559,521 km (0.03 R)
- M66: 45,671,482 km (0.114 R)
- M67: 48,750,057 km (0.088 R)
- M68: 52,425,527 km (0.111 R)
- M69: 54,135,131 km (0.081 R)
- M70: 56,080,203 km (0.066 R)
- M71: 56,297,718 km (0.078 R)
- M72: 56,733,646 km (0.046 R)
- M73: 57,499,288 km (0.038 R)
- M74: 57,608,943 km (0.094 R)
- M75: 58,709,086 km (0.05 R)
- M76: 59,594,406 km (0.109 R)
- M77: 62,276,247 km (0.101 R)
- M78: 62,727,135 km (0.114 R)
- M79: 64,085,933 km (0.116 R)
- M80: 64,655,153 km (0.098 R)
- M81: 65,454,604 km (0.105 R)
- M82: 68,568,932 km (0.092 R)
- M83: 69,501,076 km (0.065 R)
- M84: 70,906,848 km (0.12 R)
- M85: 71,142,165 km (0.064 R)
- M86: 71,377,632 km (0.039 R)
- M87: 75,180,560 km (0.09 R)
- M88: 76,382,279 km (0.051 R)
- M89: 76,623,431 km (0.11 R)
- M90: 76,744,156 km (0.036 R)
- M91: 77,227,358 km (0.072 R)
- M92: 77,348,382 km (0.054 R)
- M93: 77,590,581 km (0.103 R)
- M94: 78,561,621 km (0.114 R)
- M95: 81,252,737 km (0.095 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: 468 - 18,982 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.