Star System Generated (Seed: 1768774982)
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: 0.94 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 783.7
Radius: 10.2
Gravity: 7.53 G
Time & Orbit
Eccentricity (e): 0.195
Orbit Range: 0.76 AU - 1.12 AU
Year: 608 Days
Day: 8.2 Hours
Environment
Temp: -175 °C
Axial Tilt: 20.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (54)
Outer Limit: 61,975,479 km
- M1: 150,047 km (0.107 R)
- M2: 230,530 km (0.095 R)
- M3: 299,345 km (0.116 R)
- M4: 364,271 km (0.045 R)
- M5: 428,000 km (0.1 R)
- M6: 560,842 km (0.12 R)
- M7: 656,435 km (0.078 R)
- M8: 723,605 km (0.08 R)
- M9: 798,404 km (0.099 R)
- M10: 924,216 km (0.113 R)
- M11: 1,000,810 km (0.096 R)
- M12: 1,131,558 km (0.101 R)
- M13: 1,226,104 km (0.118 R)
- M14: 1,423,424 km (0.058 R)
- M15: 1,493,735 km (0.103 R)
- M16: 1,618,051 km (0.062 R)
- M17: 1,698,385 km (0.112 R)
- M18: 1,849,329 km (0.087 R)
- M19: 1,947,764 km (0.092 R)
- M20: 2,194,302 km (0.111 R)
- M21: 2,291,241 km (0.055 R)
- M22: 2,397,306 km (0.099 R)
- M23: 2,466,270 km (0.043 R)
- M24: 2,598,665 km (0.062 R)
- M25: 2,669,724 km (0.03 R)
- M26: 2,757,388 km (0.066 R)
- M27: 3,176,860 km (0.12 R)
- M28: 3,244,479 km (0.11 R)
- M29: 3,321,222 km (0.041 R)
- M30: 3,563,720 km (0.048 R)
- M31: 3,722,743 km (0.043 R)
- M32: 3,902,260 km (0.054 R)
- M33: 4,130,696 km (0.06 R)
- M34: 4,260,547 km (0.074 R)
- M35: 4,354,046 km (0.087 R)
- M36: 4,610,158 km (0.074 R)
- M37: 4,687,051 km (0.061 R)
- M38: 4,793,415 km (0.097 R)
- M39: 4,871,355 km (0.116 R)
- M40: 4,969,342 km (0.113 R)
- M41: 5,097,697 km (0.101 R)
- M42: 5,307,284 km (0.09 R)
- M43: 5,448,654 km (0.11 R)
- M44: 5,519,862 km (0.046 R)
- M45: 5,611,865 km (0.096 R)
- M46: 5,755,928 km (0.099 R)
- M47: 6,005,756 km (0.119 R)
- M48: 6,355,067 km (0.119 R)
- M49: 6,602,502 km (0.068 R)
- M50: 6,711,110 km (0.108 R)
- M51: 6,996,244 km (0.066 R)
- M52: 7,296,636 km (0.088 R)
- M53: 7,442,793 km (0.066 R)
- M54: 7,749,319 km (0.104 R)
Planet 2 - Gas Giant
Semi-Major Axis: 1.05 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 277.1
Radius: 11.6
Gravity: 2.06 G
Time & Orbit
Eccentricity (e): 0.126
Orbit Range: 0.92 AU - 1.18 AU
Year: 717 Days
Day: 7.1 Hours
Environment
Temp: -182 °C
Axial Tilt: 48.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (42)
Outer Limit: 61,975,479 km
- M1: 150,196 km (0.06 R)
- M2: 247,884 km (0.078 R)
- M3: 338,989 km (0.068 R)
- M4: 457,321 km (0.115 R)
- M5: 537,655 km (0.101 R)
- M6: 627,563 km (0.079 R)
- M7: 773,720 km (0.113 R)
- M8: 900,280 km (0.096 R)
- M9: 982,708 km (0.055 R)
- M10: 1,170,903 km (0.038 R)
- M11: 1,381,836 km (0.059 R)
- M12: 1,467,705 km (0.086 R)
- M13: 1,639,293 km (0.073 R)
- M14: 1,742,067 km (0.118 R)
- M15: 1,817,764 km (0.084 R)
- M16: 1,924,427 km (0.102 R)
- M17: 2,063,852 km (0.115 R)
- M18: 2,188,018 km (0.057 R)
- M19: 2,263,715 km (0.12 R)
- M20: 2,463,428 km (0.074 R)
- M21: 2,582,059 km (0.058 R)
- M22: 2,750,207 km (0.119 R)
- M23: 2,915,064 km (0.09 R)
- M24: 3,076,181 km (0.079 R)
- M25: 3,283,524 km (0.102 R)
- M26: 3,370,739 km (0.105 R)
- M27: 3,473,513 km (0.062 R)
- M28: 3,555,044 km (0.107 R)
- M29: 3,682,202 km (0.114 R)
- M30: 3,780,488 km (0.067 R)
- M31: 4,182,607 km (0.084 R)
- M32: 4,404,909 km (0.066 R)
- M33: 4,753,772 km (0.119 R)
- M34: 4,827,972 km (0.113 R)
- M35: 5,069,722 km (0.11 R)
- M36: 5,187,905 km (0.059 R)
- M37: 5,264,349 km (0.082 R)
- M38: 5,349,769 km (0.105 R)
- M39: 5,792,430 km (0.105 R)
- M40: 5,898,345 km (0.054 R)
- M41: 5,978,230 km (0.101 R)
- M42: 6,094,168 km (0.114 R)
Planet 3 - Gas Giant
Semi-Major Axis: 1.18 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 72.3
Radius: 8.2
Gravity: 1.08 G
Time & Orbit
Eccentricity (e): 0.16
Orbit Range: 0.99 AU - 1.37 AU
Year: 855 Days
Day: 13 Hours
Environment
Temp: -180 °C
Axial Tilt: 13.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (43)
Outer Limit: 61,975,479 km
- M1: 105,616 km (0.111 R)
- M2: 158,873 km (0.095 R)
- M3: 214,075 km (0.101 R)
- M4: 267,182 km (0.119 R)
- M5: 324,478 km (0.11 R)
- M6: 381,923 km (0.054 R)
- M7: 471,682 km (0.084 R)
- M8: 544,985 km (0.069 R)
- M9: 629,059 km (0.114 R)
- M10: 727,943 km (0.074 R)
- M11: 814,560 km (0.104 R)
- M12: 890,107 km (0.1 R)
- M13: 994,826 km (0.072 R)
- M14: 1,048,831 km (0.115 R)
- M15: 1,107,772 km (0.108 R)
- M16: 1,254,079 km (0.091 R)
- M17: 1,363,734 km (0.119 R)
- M18: 1,472,193 km (0.107 R)
- M19: 1,633,609 km (0.089 R)
- M20: 1,698,085 km (0.083 R)
- M21: 1,805,796 km (0.058 R)
- M22: 1,862,793 km (0.092 R)
- M23: 1,998,478 km (0.115 R)
- M24: 2,082,552 km (0.103 R)
- M25: 2,157,650 km (0.088 R)
- M26: 2,218,387 km (0.099 R)
- M27: 2,336,420 km (0.068 R)
- M28: 2,393,716 km (0.114 R)
- M29: 2,611,231 km (0.056 R)
- M30: 2,719,689 km (0.115 R)
- M31: 2,901,899 km (0.076 R)
- M32: 3,036,986 km (0.031 R)
- M33: 3,139,760 km (0.117 R)
- M34: 3,354,583 km (0.078 R)
- M35: 3,413,375 km (0.085 R)
- M36: 3,466,781 km (0.105 R)
- M37: 3,544,273 km (0.047 R)
- M38: 3,646,448 km (0.078 R)
- M39: 3,743,537 km (0.091 R)
- M40: 3,804,723 km (0.075 R)
- M41: 3,940,408 km (0.067 R)
- M42: 4,002,491 km (0.063 R)
- M43: 4,216,566 km (0.052 R)
Planet 4 - Gas Giant
Semi-Major Axis: 1.34 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 529
Radius: 8.1
Gravity: 8.06 G
Time & Orbit
Eccentricity (e): 0.163
Orbit Range: 1.12 AU - 1.56 AU
Year: 1034 Days
Day: 11.3 Hours
Environment
Temp: -180 °C
Axial Tilt: 14.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (58)
Outer Limit: 61,975,479 km
- M1: 103,223 km (0.025 R)
- M2: 158,275 km (0.094 R)
- M3: 231,278 km (0.104 R)
- M4: 282,142 km (0.047 R)
- M5: 346,768 km (0.108 R)
- M6: 417,677 km (0.09 R)
- M7: 469,887 km (0.097 R)
- M8: 571,165 km (0.085 R)
- M9: 624,721 km (0.099 R)
- M10: 796,758 km (0.095 R)
- M11: 907,461 km (0.052 R)
- M12: 1,070,074 km (0.06 R)
- M13: 1,278,015 km (0.116 R)
- M14: 1,394,103 km (0.093 R)
- M15: 1,613,862 km (0.103 R)
- M16: 1,788,143 km (0.063 R)
- M17: 1,985,164 km (0.066 R)
- M18: 2,276,580 km (0.061 R)
- M19: 2,563,210 km (0.056 R)
- M20: 2,776,536 km (0.112 R)
- M21: 2,995,548 km (0.101 R)
- M22: 3,131,682 km (0.038 R)
- M23: 3,400,060 km (0.119 R)
- M24: 3,624,308 km (0.092 R)
- M25: 3,675,919 km (0.119 R)
- M26: 3,727,829 km (0.106 R)
- M27: 4,065,771 km (0.102 R)
- M28: 4,151,790 km (0.1 R)
- M29: 4,216,715 km (0.067 R)
- M30: 4,314,851 km (0.071 R)
- M31: 4,424,656 km (0.078 R)
- M32: 4,861,931 km (0.066 R)
- M33: 4,999,262 km (0.088 R)
- M34: 5,126,270 km (0.09 R)
- M35: 5,301,150 km (0.087 R)
- M36: 5,777,320 km (0.115 R)
- M37: 5,910,761 km (0.106 R)
- M38: 6,008,449 km (0.077 R)
- M39: 6,479,533 km (0.107 R)
- M40: 6,605,494 km (0.086 R)
- M41: 7,039,926 km (0.106 R)
- M42: 7,339,122 km (0.088 R)
- M43: 7,404,646 km (0.117 R)
- M44: 7,496,798 km (0.111 R)
- M45: 7,576,085 km (0.064 R)
- M46: 7,642,357 km (0.112 R)
- M47: 8,179,712 km (0.091 R)
- M48: 8,673,685 km (0.087 R)
- M49: 8,743,098 km (0.095 R)
- M50: 8,840,486 km (0.076 R)
- M51: 8,910,348 km (0.091 R)
- M52: 9,022,397 km (0.1 R)
- M53: 9,078,646 km (0.093 R)
- M54: 9,233,929 km (0.033 R)
- M55: 9,404,321 km (0.077 R)
- M56: 9,461,317 km (0.088 R)
- M57: 9,575,610 km (0.057 R)
- M58: 9,633,056 km (0.063 R)
Planet 5 - Gas Giant
Semi-Major Axis: 2.23 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 384.6
Radius: 8.9
Gravity: 4.86 G
Time & Orbit
Eccentricity (e): 0.084
Orbit Range: 2.04 AU - 2.42 AU
Year: 2221 Days
Day: 10.3 Hours
Environment
Temp: -208 °C
Axial Tilt: 13.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (73)
Outer Limit: 61,975,479 km
- M1: 111,899 km (0.059 R)
- M2: 170,990 km (0.12 R)
- M3: 248,033 km (0.112 R)
- M4: 306,526 km (0.083 R)
- M5: 371,452 km (0.093 R)
- M6: 565,779 km (0.094 R)
- M7: 628,610 km (0.102 R)
- M8: 754,272 km (0.116 R)
- M9: 864,526 km (0.083 R)
- M10: 1,031,627 km (0.119 R)
- M11: 1,200,523 km (0.069 R)
- M12: 1,349,822 km (0.094 R)
- M13: 1,465,910 km (0.085 R)
- M14: 1,770,940 km (0.064 R)
- M15: 1,963,771 km (0.073 R)
- M16: 2,073,726 km (0.118 R)
- M17: 2,140,746 km (0.116 R)
- M18: 2,242,771 km (0.069 R)
- M19: 2,346,443 km (0.12 R)
- M20: 2,416,454 km (0.116 R)
- M21: 2,475,246 km (0.118 R)
- M22: 2,776,836 km (0.116 R)
- M23: 2,900,852 km (0.09 R)
- M24: 3,001,382 km (0.119 R)
- M25: 3,628,945 km (0.113 R)
- M26: 3,751,167 km (0.113 R)
- M27: 3,874,734 km (0.065 R)
- M28: 4,027,623 km (0.119 R)
- M29: 4,083,723 km (0.098 R)
- M30: 4,182,457 km (0.098 R)
- M31: 4,396,831 km (0.076 R)
- M32: 4,512,769 km (0.11 R)
- M33: 4,585,624 km (0.057 R)
- M34: 4,986,247 km (0.07 R)
- M35: 5,137,490 km (0.096 R)
- M36: 5,244,303 km (0.115 R)
- M37: 5,460,023 km (0.1 R)
- M38: 5,852,717 km (0.04 R)
- M39: 6,270,844 km (0.049 R)
- M40: 6,336,068 km (0.075 R)
- M41: 6,434,204 km (0.119 R)
- M42: 6,615,667 km (0.073 R)
- M43: 6,731,904 km (0.043 R)
- M44: 6,832,135 km (0.034 R)
- M45: 6,932,964 km (0.115 R)
- M46: 7,101,860 km (0.09 R)
- M47: 7,289,455 km (0.092 R)
- M48: 7,617,075 km (0.114 R)
- M49: 7,791,506 km (0.061 R)
- M50: 7,879,170 km (0.119 R)
- M51: 8,126,605 km (0.046 R)
- M52: 8,286,974 km (0.117 R)
- M53: 8,556,549 km (0.034 R)
- M54: 8,719,761 km (0.061 R)
- M55: 8,865,768 km (0.119 R)
- M56: 9,049,175 km (0.073 R)
- M57: 9,104,526 km (0.102 R)
- M58: 9,890,663 km (0.114 R)
- M59: 10,023,805 km (0.092 R)
- M60: 10,601,253 km (0.116 R)
- M61: 11,467,574 km (0.103 R)
- M62: 11,687,633 km (0.118 R)
- M63: 11,747,921 km (0.063 R)
- M64: 11,990,120 km (0.091 R)
- M65: 12,397,325 km (0.078 R)
- M66: 12,829,813 km (0.072 R)
- M67: 12,912,839 km (0.112 R)
- M68: 12,996,016 km (0.09 R)
- M69: 13,162,817 km (0.094 R)
- M70: 13,330,217 km (0.108 R)
- M71: 13,688,654 km (0.09 R)
- M72: 13,858,298 km (0.052 R)
- M73: 14,457,886 km (0.091 R)
Planet 6 - Gas Giant
Semi-Major Axis: 2.61 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 691.1
Radius: 14.1
Gravity: 3.48 G
Time & Orbit
Eccentricity (e): 0.069
Orbit Range: 2.43 AU - 2.79 AU
Year: 2812 Days
Day: 12 Hours
Environment
Temp: -208 °C
Axial Tilt: 26.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (66)
Outer Limit: 61,975,479 km
- M1: 175,927 km (0.106 R)
- M2: 303,684 km (0.064 R)
- M3: 453,730 km (0.075 R)
- M4: 682,316 km (0.04 R)
- M5: 812,616 km (0.107 R)
- M6: 952,490 km (0.101 R)
- M7: 1,057,807 km (0.117 R)
- M8: 1,167,611 km (0.09 R)
- M9: 1,328,429 km (0.073 R)
- M10: 1,484,759 km (0.089 R)
- M11: 1,737,729 km (0.053 R)
- M12: 1,896,452 km (0.03 R)
- M13: 2,102,149 km (0.051 R)
- M14: 2,329,688 km (0.111 R)
- M15: 2,565,753 km (0.112 R)
- M16: 2,702,037 km (0.086 R)
- M17: 3,061,520 km (0.094 R)
- M18: 3,353,835 km (0.114 R)
- M19: 3,469,923 km (0.113 R)
- M20: 3,587,507 km (0.093 R)
- M21: 4,177,670 km (0.114 R)
- M22: 4,267,130 km (0.1 R)
- M23: 4,375,289 km (0.11 R)
- M24: 4,761,102 km (0.03 R)
- M25: 4,854,601 km (0.103 R)
- M26: 5,234,878 km (0.073 R)
- M27: 5,546,191 km (0.082 R)
- M28: 5,923,926 km (0.101 R)
- M29: 6,126,033 km (0.06 R)
- M30: 6,289,394 km (0.05 R)
- M31: 6,454,251 km (0.112 R)
- M32: 6,599,809 km (0.041 R)
- M33: 6,830,639 km (0.081 R)
- M34: 7,235,600 km (0.103 R)
- M35: 7,473,610 km (0.107 R)
- M36: 7,957,709 km (0.039 R)
- M37: 8,248,527 km (0.081 R)
- M38: 9,235,425 km (0.055 R)
- M39: 9,423,319 km (0.071 R)
- M40: 9,517,566 km (0.077 R)
- M41: 9,659,834 km (0.103 R)
- M42: 9,778,764 km (0.08 R)
- M43: 10,235,486 km (0.087 R)
- M44: 11,020,426 km (0.118 R)
- M45: 11,395,019 km (0.092 R)
- M46: 12,003,284 km (0.078 R)
- M47: 12,234,114 km (0.069 R)
- M48: 12,388,798 km (0.078 R)
- M49: 12,622,171 km (0.12 R)
- M50: 13,093,105 km (0.101 R)
- M51: 13,810,427 km (0.119 R)
- M52: 13,971,544 km (0.108 R)
- M53: 15,227,866 km (0.048 R)
- M54: 15,450,019 km (0.097 R)
- M55: 15,981,989 km (0.09 R)
- M56: 16,349,402 km (0.112 R)
- M57: 16,576,940 km (0.09 R)
- M58: 16,834,248 km (0.097 R)
- M59: 17,265,838 km (0.115 R)
- M60: 17,701,318 km (0.064 R)
- M61: 17,905,668 km (0.075 R)
- M62: 18,052,125 km (0.119 R)
- M63: 18,346,384 km (0.032 R)
- M64: 18,701,529 km (0.045 R)
- M65: 19,088,838 km (0.078 R)
- M66: 19,508,759 km (0.105 R)
Planet 7 - Ice Giant
Semi-Major Axis: 9.17 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 431.8
Radius: 7.9
Gravity: 6.92 G
Time & Orbit
Eccentricity (e): 0.159
Orbit Range: 7.71 AU - 10.63 AU
Year: 18518 Days
Day: 21.2 Hours
Environment
Temp: -227 °C
Axial Tilt: 31.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (81)
Outer Limit: 61,975,479 km
- M1: 151,094 km (0.104 R)
- M2: 486,193 km (0.068 R)
- M3: 574,755 km (0.066 R)
- M4: 688,898 km (0.095 R)
- M5: 1,293,722 km (0.116 R)
- M6: 1,420,282 km (0.065 R)
- M7: 1,524,701 km (0.119 R)
- M8: 1,713,494 km (0.055 R)
- M9: 2,832,785 km (0.096 R)
- M10: 3,514,802 km (0.08 R)
- M11: 3,801,431 km (0.034 R)
- M12: 3,984,390 km (0.102 R)
- M13: 4,058,441 km (0.071 R)
- M14: 4,132,940 km (0.067 R)
- M15: 4,397,130 km (0.074 R)
- M16: 4,589,363 km (0.118 R)
- M17: 4,745,095 km (0.069 R)
- M18: 5,021,851 km (0.104 R)
- M19: 5,385,523 km (0.09 R)
- M20: 5,508,642 km (0.063 R)
- M21: 5,674,247 km (0.117 R)
- M22: 6,010,394 km (0.112 R)
- M23: 6,526,955 km (0.056 R)
- M24: 7,556,188 km (0.04 R)
- M25: 8,876,090 km (0.088 R)
- M26: 9,315,310 km (0.053 R)
- M27: 12,203,596 km (0.058 R)
- M28: 12,801,090 km (0.077 R)
- M29: 13,352,508 km (0.076 R)
- M30: 14,421,534 km (0.064 R)
- M31: 15,928,583 km (0.094 R)
- M32: 16,283,429 km (0.099 R)
- M33: 16,640,818 km (0.114 R)
- M34: 17,667,658 km (0.03 R)
- M35: 18,034,921 km (0.105 R)
- M36: 18,901,691 km (0.101 R)
- M37: 20,163,399 km (0.089 R)
- M38: 21,257,259 km (0.057 R)
- M39: 22,502,362 km (0.067 R)
- M40: 22,767,450 km (0.118 R)
- M41: 23,233,896 km (0.097 R)
- M42: 23,703,483 km (0.088 R)
- M43: 23,770,952 km (0.094 R)
- M44: 26,656,545 km (0.094 R)
- M45: 30,086,974 km (0.097 R)
- M46: 30,525,446 km (0.085 R)
- M47: 31,928,075 km (0.094 R)
- M48: 33,275,952 km (0.106 R)
- M49: 33,351,349 km (0.076 R)
- M50: 34,948,606 km (0.078 R)
- M51: 36,415,114 km (0.076 R)
- M52: 37,038,488 km (0.067 R)
- M53: 37,194,967 km (0.116 R)
- M54: 38,771,131 km (0.047 R)
- M55: 39,407,819 km (0.116 R)
- M56: 39,727,360 km (0.111 R)
- M57: 39,967,614 km (0.04 R)
- M58: 40,047,799 km (0.058 R)
- M59: 40,691,219 km (0.083 R)
- M60: 42,396,635 km (0.064 R)
- M61: 42,478,315 km (0.116 R)
- M62: 42,970,193 km (0.052 R)
- M63: 43,052,322 km (0.079 R)
- M64: 44,125,238 km (0.09 R)
- M65: 44,623,250 km (0.115 R)
- M66: 44,873,078 km (0.079 R)
- M67: 45,541,332 km (0.068 R)
- M68: 45,960,655 km (0.029 R)
- M69: 46,803,190 km (0.114 R)
- M70: 47,311,075 km (0.058 R)
- M71: 49,964,642 km (0.109 R)
- M72: 50,397,129 km (0.12 R)
- M73: 52,314,824 km (0.079 R)
- M74: 54,522,739 km (0.091 R)
- M75: 57,031,645 km (0.113 R)
- M76: 57,574,237 km (0.076 R)
- M77: 58,118,474 km (0.096 R)
- M78: 60,036,617 km (0.093 R)
- M79: 60,220,324 km (0.096 R)
- M80: 60,496,332 km (0.103 R)
- M81: 60,957,392 km (0.092 R)
Kuiper Belt
Range: 30 - 58 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 172 - 10,373 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.