Star System Generated (Seed: 1768752781)
Star Details
Spectral Class: M1V
Temperature: 3,483 K
Mass: 0.32 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: 11.3 AU
Planetary System (8 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 0.63 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 2.32
Radius: 1.4
Gravity: 1.18 G
Time & Orbit
Eccentricity (e): 0.121
Orbit Range: 0.55 AU - 0.71 AU
Year: 323 Days
Day: 39.4 Hours
Environment
Temp: -134 °C
Axial Tilt: 36.7 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Satellites (1)
Outer Limit: 44,141,560 km
- M1: 170,242 km (0.115 R)
Planet 2 - Gas Giant
Semi-Major Axis: 0.88 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 606.9
Radius: 10.7
Gravity: 5.3 G
Time & Orbit
Eccentricity (e): 0.18
Orbit Range: 0.72 AU - 1.04 AU
Year: 533 Days
Day: 14.6 Hours
Environment
Temp: -152 °C
Axial Tilt: 29.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (54)
Outer Limit: 44,141,560 km
- M1: 140,472 km (0.104 R)
- M2: 224,546 km (0.069 R)
- M3: 302,636 km (0.09 R)
- M4: 398,529 km (0.085 R)
- M5: 467,643 km (0.117 R)
- M6: 568,921 km (0.114 R)
- M7: 662,120 km (0.115 R)
- M8: 747,690 km (0.103 R)
- M9: 860,637 km (0.094 R)
- M10: 955,482 km (0.107 R)
- M11: 1,039,107 km (0.068 R)
- M12: 1,151,305 km (0.092 R)
- M13: 1,262,307 km (0.067 R)
- M14: 1,338,452 km (0.076 R)
- M15: 1,506,899 km (0.067 R)
- M16: 1,599,800 km (0.117 R)
- M17: 1,676,693 km (0.103 R)
- M18: 1,785,451 km (0.105 R)
- M19: 1,871,619 km (0.057 R)
- M20: 2,041,861 km (0.065 R)
- M21: 2,145,383 km (0.095 R)
- M22: 2,237,236 km (0.046 R)
- M23: 2,350,781 km (0.086 R)
- M24: 2,418,399 km (0.105 R)
- M25: 2,500,528 km (0.12 R)
- M26: 2,576,674 km (0.059 R)
- M27: 2,646,536 km (0.11 R)
- M28: 2,752,601 km (0.091 R)
- M29: 2,867,342 km (0.06 R)
- M30: 2,969,069 km (0.109 R)
- M31: 3,049,852 km (0.11 R)
- M32: 3,168,632 km (0.093 R)
- M33: 3,388,093 km (0.069 R)
- M34: 3,534,549 km (0.058 R)
- M35: 3,635,976 km (0.058 R)
- M36: 3,786,023 km (0.103 R)
- M37: 3,994,712 km (0.107 R)
- M38: 4,067,865 km (0.073 R)
- M39: 4,182,607 km (0.09 R)
- M40: 4,273,413 km (0.077 R)
- M41: 4,474,024 km (0.117 R)
- M42: 4,541,492 km (0.102 R)
- M43: 4,772,172 km (0.092 R)
- M44: 4,884,520 km (0.03 R)
- M45: 4,962,909 km (0.071 R)
- M46: 5,050,424 km (0.026 R)
- M47: 5,200,471 km (0.043 R)
- M48: 5,352,013 km (0.109 R)
- M49: 5,459,873 km (0.108 R)
- M50: 5,541,255 km (0.082 R)
- M51: 5,732,740 km (0.107 R)
- M52: 6,150,268 km (0.083 R)
- M53: 6,339,210 km (0.118 R)
- M54: 6,453,353 km (0.057 R)
Planet 3 - Gas Giant
Semi-Major Axis: 1.01 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 896.1
Radius: 11.3
Gravity: 7.02 G
Time & Orbit
Eccentricity (e): 0.209
Orbit Range: 0.8 AU - 1.22 AU
Year: 655 Days
Day: 10.4 Hours
Environment
Temp: -167 °C
Axial Tilt: 25 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (57)
Outer Limit: 44,141,560 km
- M1: 202,556 km (0.12 R)
- M2: 295,755 km (0.115 R)
- M3: 425,756 km (0.048 R)
- M4: 515,365 km (0.109 R)
- M5: 637,137 km (0.09 R)
- M6: 712,535 km (0.04 R)
- M7: 862,282 km (0.082 R)
- M8: 1,017,116 km (0.08 R)
- M9: 1,119,740 km (0.058 R)
- M10: 1,207,105 km (0.066 R)
- M11: 1,422,377 km (0.093 R)
- M12: 1,686,267 km (0.054 R)
- M13: 1,794,726 km (0.104 R)
- M14: 1,898,247 km (0.102 R)
- M15: 2,072,828 km (0.056 R)
- M16: 2,158,248 km (0.107 R)
- M17: 2,316,673 km (0.096 R)
- M18: 2,603,302 km (0.105 R)
- M19: 2,841,013 km (0.088 R)
- M20: 2,927,630 km (0.066 R)
- M21: 3,023,971 km (0.112 R)
- M22: 3,121,509 km (0.096 R)
- M23: 3,265,123 km (0.079 R)
- M24: 3,512,558 km (0.082 R)
- M25: 3,587,058 km (0.117 R)
- M26: 4,025,978 km (0.102 R)
- M27: 4,182,607 km (0.091 R)
- M28: 4,301,537 km (0.079 R)
- M29: 4,471,929 km (0.105 R)
- M30: 4,552,862 km (0.05 R)
- M31: 4,624,070 km (0.103 R)
- M32: 4,736,867 km (0.115 R)
- M33: 4,892,000 km (0.042 R)
- M34: 4,996,569 km (0.048 R)
- M35: 5,154,544 km (0.104 R)
- M36: 5,260,908 km (0.119 R)
- M37: 5,389,413 km (0.111 R)
- M38: 5,551,577 km (0.099 R)
- M39: 5,627,722 km (0.101 R)
- M40: 5,737,378 km (0.106 R)
- M41: 5,869,622 km (0.118 R)
- M42: 6,115,112 km (0.116 R)
- M43: 6,193,801 km (0.109 R)
- M44: 6,329,636 km (0.089 R)
- M45: 6,420,890 km (0.08 R)
- M46: 6,592,928 km (0.094 R)
- M47: 6,754,793 km (0.104 R)
- M48: 6,859,661 km (0.072 R)
- M49: 7,071,043 km (0.061 R)
- M50: 7,153,770 km (0.085 R)
- M51: 7,224,979 km (0.113 R)
- M52: 7,404,047 km (0.056 R)
- M53: 7,488,121 km (0.105 R)
- M54: 7,560,377 km (0.079 R)
- M55: 7,717,904 km (0.072 R)
- M56: 7,900,862 km (0.106 R)
- M57: 8,433,730 km (0.095 R)
Planet 4 - Gas Giant
Semi-Major Axis: 1.08 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 54.6
Radius: 10.8
Gravity: 0.47 G
Time & Orbit
Eccentricity (e): 0.054
Orbit Range: 1.02 AU - 1.14 AU
Year: 725 Days
Day: 9.7 Hours
Environment
Temp: -156 °C
Axial Tilt: 24.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (33)
Outer Limit: 44,141,560 km
- M1: 135,984 km (0.093 R)
- M2: 210,933 km (0.106 R)
- M3: 279,598 km (0.114 R)
- M4: 355,145 km (0.082 R)
- M5: 445,353 km (0.097 R)
- M6: 552,914 km (0.06 R)
- M7: 656,735 km (0.058 R)
- M8: 794,514 km (0.067 R)
- M9: 864,376 km (0.1 R)
- M10: 1,053,618 km (0.083 R)
- M11: 1,183,170 km (0.035 R)
- M12: 1,325,437 km (0.102 R)
- M13: 1,409,810 km (0.061 R)
- M14: 1,565,243 km (0.052 R)
- M15: 1,682,527 km (0.095 R)
- M16: 1,770,491 km (0.054 R)
- M17: 1,847,833 km (0.115 R)
- M18: 1,942,977 km (0.119 R)
- M19: 2,044,105 km (0.058 R)
- M20: 2,116,810 km (0.066 R)
- M21: 2,207,765 km (0.098 R)
- M22: 2,291,391 km (0.11 R)
- M23: 2,402,991 km (0.092 R)
- M24: 2,489,009 km (0.093 R)
- M25: 2,580,713 km (0.049 R)
- M26: 2,655,063 km (0.087 R)
- M27: 2,725,224 km (0.107 R)
- M28: 2,815,133 km (0.1 R)
- M29: 2,978,643 km (0.078 R)
- M30: 3,076,181 km (0.114 R)
- M31: 3,199,749 km (0.069 R)
- M32: 3,355,331 km (0.07 R)
- M33: 3,575,240 km (0.086 R)
Planet 5 - Gas Giant
Semi-Major Axis: 1.35 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 64.7
Radius: 8.5
Gravity: 0.9 G
Time & Orbit
Eccentricity (e): 0.089
Orbit Range: 1.23 AU - 1.47 AU
Year: 1013 Days
Day: 7.7 Hours
Environment
Temp: -182 °C
Axial Tilt: 47.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (31)
Outer Limit: 44,141,560 km
- M1: 112,647 km (0.107 R)
- M2: 177,273 km (0.077 R)
- M3: 235,168 km (0.105 R)
- M4: 372,349 km (0.056 R)
- M5: 445,203 km (0.05 R)
- M6: 558,299 km (0.087 R)
- M7: 829,969 km (0.119 R)
- M8: 1,070,074 km (0.089 R)
- M9: 1,128,267 km (0.032 R)
- M10: 1,239,418 km (0.112 R)
- M11: 1,314,217 km (0.119 R)
- M12: 1,427,014 km (0.066 R)
- M13: 1,696,290 km (0.089 R)
- M14: 1,844,542 km (0.113 R)
- M15: 1,925,474 km (0.092 R)
- M16: 2,028,248 km (0.069 R)
- M17: 2,101,252 km (0.108 R)
- M18: 2,217,938 km (0.114 R)
- M19: 2,597,767 km (0.025 R)
- M20: 2,798,378 km (0.077 R)
- M21: 2,868,240 km (0.048 R)
- M22: 2,968,321 km (0.056 R)
- M23: 3,129,737 km (0.112 R)
- M24: 3,306,412 km (0.092 R)
- M25: 3,618,623 km (0.065 R)
- M26: 3,682,202 km (0.074 R)
- M27: 3,739,797 km (0.119 R)
- M28: 3,836,288 km (0.115 R)
- M29: 3,953,423 km (0.098 R)
- M30: 4,590,710 km (0.09 R)
- M31: 4,735,969 km (0.104 R)
Planet 6 - Gas Giant
Semi-Major Axis: 3.2 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 318.1
Radius: 10.6
Gravity: 2.83 G
Time & Orbit
Eccentricity (e): 0.144
Orbit Range: 2.74 AU - 3.66 AU
Year: 3696 Days
Day: 9.4 Hours
Environment
Temp: -197 °C
Axial Tilt: 15.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (53)
Outer Limit: 44,141,560 km
- M1: 133,591 km (0.115 R)
- M2: 344,075 km (0.095 R)
- M3: 670,198 km (0.082 R)
- M4: 950,844 km (0.115 R)
- M5: 1,052,720 km (0.081 R)
- M6: 1,147,715 km (0.033 R)
- M7: 1,279,211 km (0.114 R)
- M8: 1,509,742 km (0.079 R)
- M9: 1,998,179 km (0.118 R)
- M10: 2,185,176 km (0.116 R)
- M11: 2,253,393 km (0.048 R)
- M12: 3,127,493 km (0.109 R)
- M13: 3,314,042 km (0.073 R)
- M14: 3,633,134 km (0.119 R)
- M15: 3,995,759 km (0.093 R)
- M16: 4,062,929 km (0.107 R)
- M17: 4,421,963 km (0.113 R)
- M18: 4,561,538 km (0.063 R)
- M19: 5,043,243 km (0.102 R)
- M20: 5,317,905 km (0.113 R)
- M21: 5,635,202 km (0.082 R)
- M22: 5,958,633 km (0.099 R)
- M23: 6,249,152 km (0.117 R)
- M24: 6,504,665 km (0.107 R)
- M25: 7,374,427 km (0.047 R)
- M26: 7,917,916 km (0.092 R)
- M27: 8,366,411 km (0.119 R)
- M28: 8,561,187 km (0.079 R)
- M29: 8,977,368 km (0.096 R)
- M30: 9,176,782 km (0.084 R)
- M31: 9,265,943 km (0.087 R)
- M32: 9,422,571 km (0.103 R)
- M33: 9,715,783 km (0.106 R)
- M34: 10,334,520 km (0.092 R)
- M35: 11,851,592 km (0.076 R)
- M36: 12,046,069 km (0.072 R)
- M37: 12,364,563 km (0.081 R)
- M38: 12,760,100 km (0.116 R)
- M39: 13,260,505 km (0.065 R)
- M40: 13,336,201 km (0.105 R)
- M41: 13,946,411 km (0.083 R)
- M42: 14,229,001 km (0.117 R)
- M43: 14,931,064 km (0.107 R)
- M44: 15,088,591 km (0.106 R)
- M45: 15,591,090 km (0.091 R)
- M46: 15,777,639 km (0.072 R)
- M47: 15,911,230 km (0.093 R)
- M48: 17,021,695 km (0.109 R)
- M49: 17,103,824 km (0.096 R)
- M50: 17,544,689 km (0.108 R)
- M51: 18,269,042 km (0.101 R)
- M52: 18,889,574 km (0.1 R)
- M53: 19,116,962 km (0.085 R)
Planet 7 - Gas Giant
Semi-Major Axis: 3.3 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 770.8
Radius: 8.4
Gravity: 10.92 G
Time & Orbit
Eccentricity (e): 0.083
Orbit Range: 3.03 AU - 3.57 AU
Year: 3871 Days
Day: 11.6 Hours
Environment
Temp: -205 °C
Axial Tilt: 34.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (82)
Outer Limit: 44,141,560 km
- M1: 127,009 km (0.09 R)
- M2: 196,422 km (0.075 R)
- M3: 408,253 km (0.109 R)
- M4: 582,534 km (0.042 R)
- M5: 926,011 km (0.095 R)
- M6: 1,146,518 km (0.06 R)
- M7: 1,369,419 km (0.119 R)
- M8: 1,500,915 km (0.075 R)
- M9: 1,560,755 km (0.094 R)
- M10: 1,856,210 km (0.073 R)
- M11: 2,018,823 km (0.116 R)
- M12: 2,428,273 km (0.102 R)
- M13: 3,263,777 km (0.111 R)
- M14: 3,381,510 km (0.058 R)
- M15: 3,580,924 km (0.049 R)
- M16: 3,702,398 km (0.119 R)
- M17: 4,287,475 km (0.114 R)
- M18: 4,656,832 km (0.082 R)
- M19: 4,991,183 km (0.093 R)
- M20: 5,172,646 km (0.109 R)
- M21: 5,241,311 km (0.109 R)
- M22: 5,659,587 km (0.116 R)
- M23: 5,730,346 km (0.111 R)
- M24: 5,801,405 km (0.108 R)
- M25: 6,016,378 km (0.07 R)
- M26: 6,331,580 km (0.103 R)
- M27: 6,602,502 km (0.104 R)
- M28: 6,826,899 km (0.074 R)
- M29: 7,053,988 km (0.104 R)
- M30: 7,309,202 km (0.061 R)
- M31: 7,489,617 km (0.119 R)
- M32: 7,907,594 km (0.071 R)
- M33: 7,986,731 km (0.104 R)
- M34: 8,279,494 km (0.1 R)
- M35: 8,630,002 km (0.054 R)
- M36: 8,848,116 km (0.079 R)
- M37: 8,930,394 km (0.1 R)
- M38: 9,068,174 km (0.09 R)
- M39: 9,178,727 km (0.07 R)
- M40: 10,108,777 km (0.077 R)
- M41: 10,194,796 km (0.097 R)
- M42: 10,425,476 km (0.118 R)
- M43: 10,628,630 km (0.031 R)
- M44: 11,424,789 km (0.106 R)
- M45: 11,754,653 km (0.096 R)
- M46: 12,362,469 km (0.084 R)
- M47: 12,546,773 km (0.114 R)
- M48: 12,855,992 km (0.054 R)
- M49: 13,136,488 km (0.064 R)
- M50: 13,324,533 km (0.118 R)
- M51: 13,862,487 km (0.057 R)
- M52: 14,666,276 km (0.111 R)
- M53: 14,828,739 km (0.097 R)
- M54: 15,254,345 km (0.102 R)
- M55: 16,083,865 km (0.06 R)
- M56: 16,453,522 km (0.117 R)
- M57: 17,752,031 km (0.107 R)
- M58: 17,821,295 km (0.076 R)
- M59: 18,238,673 km (0.104 R)
- M60: 18,413,553 km (0.051 R)
- M61: 18,553,726 km (0.118 R)
- M62: 19,331,785 km (0.085 R)
- M63: 19,438,747 km (0.088 R)
- M64: 19,940,199 km (0.042 R)
- M65: 20,373,584 km (0.058 R)
- M66: 20,627,751 km (0.03 R)
- M67: 20,700,605 km (0.105 R)
- M68: 21,988,793 km (0.101 R)
- M69: 22,286,792 km (0.11 R)
- M70: 22,361,591 km (0.103 R)
- M71: 22,511,338 km (0.096 R)
- M72: 23,151,318 km (0.11 R)
- M73: 24,179,953 km (0.091 R)
- M74: 24,487,675 km (0.083 R)
- M75: 24,564,718 km (0.108 R)
- M76: 24,796,595 km (0.093 R)
- M77: 24,912,833 km (0.099 R)
- M78: 25,145,756 km (0.102 R)
- M79: 25,692,088 km (0.101 R)
- M80: 25,927,405 km (0.066 R)
- M81: 26,242,309 km (0.12 R)
- M82: 26,439,778 km (0.066 R)
Planet 8 - Gas Giant
Semi-Major Axis: 5.53 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 758.8
Radius: 8.6
Gravity: 10.26 G
Time & Orbit
Eccentricity (e): 0.115
Orbit Range: 4.89 AU - 6.17 AU
Year: 8397 Days
Day: 5.5 Hours
Environment
Temp: -223 °C
Axial Tilt: 39.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (91)
Outer Limit: 44,141,560 km
- M1: 132,693 km (0.028 R)
- M2: 196,123 km (0.113 R)
- M3: 420,370 km (0.062 R)
- M4: 659,577 km (0.039 R)
- M5: 1,198,129 km (0.095 R)
- M6: 1,376,001 km (0.073 R)
- M7: 1,583,793 km (0.112 R)
- M8: 1,937,442 km (0.075 R)
- M9: 2,006,556 km (0.119 R)
- M10: 2,170,964 km (0.046 R)
- M11: 2,291,091 km (0.101 R)
- M12: 2,388,928 km (0.108 R)
- M13: 3,058,229 km (0.042 R)
- M14: 3,275,595 km (0.119 R)
- M15: 3,497,897 km (0.104 R)
- M16: 3,554,146 km (0.098 R)
- M17: 4,284,184 km (0.069 R)
- M18: 4,344,621 km (0.053 R)
- M19: 4,435,726 km (0.064 R)
- M20: 4,496,762 km (0.11 R)
- M21: 4,650,848 km (0.04 R)
- M22: 4,806,580 km (0.116 R)
- M23: 5,059,550 km (0.075 R)
- M24: 5,219,769 km (0.1 R)
- M25: 5,381,783 km (0.095 R)
- M26: 5,479,770 km (0.109 R)
- M27: 6,012,338 km (0.053 R)
- M28: 6,701,237 km (0.096 R)
- M29: 7,966,236 km (0.095 R)
- M30: 8,303,280 km (0.116 R)
- M31: 8,454,673 km (0.089 R)
- M32: 9,342,387 km (0.109 R)
- M33: 9,737,625 km (0.064 R)
- M34: 9,857,153 km (0.064 R)
- M35: 9,937,188 km (0.081 R)
- M36: 11,498,541 km (0.048 R)
- M37: 11,667,288 km (0.094 R)
- M38: 11,836,932 km (0.077 R)
- M39: 12,007,323 km (0.114 R)
- M40: 12,827,868 km (0.084 R)
- M41: 13,399,631 km (0.118 R)
- M42: 14,477,184 km (0.108 R)
- M43: 14,750,799 km (0.055 R)
- M44: 16,666,549 km (0.119 R)
- M45: 16,761,993 km (0.101 R)
- M46: 16,857,586 km (0.112 R)
- M47: 17,386,863 km (0.053 R)
- M48: 17,532,122 km (0.103 R)
- M49: 18,313,771 km (0.069 R)
- M50: 20,572,400 km (0.115 R)
- M51: 21,448,296 km (0.092 R)
- M52: 22,336,308 km (0.095 R)
- M53: 23,396,509 km (0.105 R)
- M54: 23,717,695 km (0.093 R)
- M55: 24,364,556 km (0.12 R)
- M56: 24,418,711 km (0.115 R)
- M57: 24,635,777 km (0.115 R)
- M58: 25,126,608 km (0.116 R)
- M59: 26,953,497 km (0.069 R)
- M60: 27,233,993 km (0.09 R)
- M61: 27,684,881 km (0.111 R)
- M62: 27,911,223 km (0.075 R)
- M63: 28,251,857 km (0.081 R)
- M64: 28,479,695 km (0.049 R)
- M65: 28,880,019 km (0.083 R)
- M66: 29,744,096 km (0.12 R)
- M67: 30,208,298 km (0.096 R)
- M68: 31,438,441 km (0.104 R)
- M69: 31,911,470 km (0.073 R)
- M70: 32,804,419 km (0.09 R)
- M71: 32,984,087 km (0.114 R)
- M72: 33,766,184 km (0.111 R)
- M73: 33,826,472 km (0.119 R)
- M74: 34,920,033 km (0.114 R)
- M75: 35,225,960 km (0.09 R)
- M76: 35,287,146 km (0.117 R)
- M77: 35,471,151 km (0.055 R)
- M78: 35,717,090 km (0.115 R)
- M79: 36,025,262 km (0.088 R)
- M80: 36,830,547 km (0.082 R)
- M81: 37,641,667 km (0.112 R)
- M82: 38,080,886 km (0.103 R)
- M83: 39,854,818 km (0.086 R)
- M84: 39,918,696 km (0.078 R)
- M85: 41,073,891 km (0.081 R)
- M86: 41,720,453 km (0.066 R)
- M87: 41,850,154 km (0.101 R)
- M88: 42,435,381 km (0.077 R)
- M89: 42,827,178 km (0.116 R)
- M90: 43,023,450 km (0.12 R)
- M91: 43,811,681 km (0.072 R)
Kuiper Belt
Range: 30 - 55 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 437 - 12,888 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.