Star System Generated (Seed: 1766452493)
Star Details
Spectral Class: M6V
Temperature: 2,833 K
Mass: 0.29 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: 10.8 AU
Planetary System (7 Planets)
Planet 1 - Gas Giant
Semi-Major Axis: 0.75 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 929.5
Radius: 12.1
Gravity: 6.35 G
Time & Orbit
Eccentricity (e): 0.103
Orbit Range: 0.67 AU - 0.83 AU
Year: 441 Days
Day: 5.2 Hours
Environment
Temp: -164 °C
Axial Tilt: 45.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (49)
Outer Limit: 29,594,142 km
- M1: 156,031 km (0.117 R)
- M2: 240,853 km (0.118 R)
- M3: 319,391 km (0.084 R)
- M4: 432,936 km (0.063 R)
- M5: 533,765 km (0.104 R)
- M6: 611,855 km (0.116 R)
- M7: 694,733 km (0.092 R)
- M8: 818,001 km (0.064 R)
- M9: 939,774 km (0.064 R)
- M10: 1,022,950 km (0.038 R)
- M11: 1,114,055 km (0.074 R)
- M12: 1,218,774 km (0.1 R)
- M13: 1,305,092 km (0.092 R)
- M14: 1,707,809 km (0.092 R)
- M15: 1,805,347 km (0.037 R)
- M16: 1,892,413 km (0.056 R)
- M17: 2,025,555 km (0.098 R)
- M18: 2,122,794 km (0.08 R)
- M19: 2,458,192 km (0.036 R)
- M20: 2,541,219 km (0.105 R)
- M21: 2,753,199 km (0.079 R)
- M22: 2,839,517 km (0.114 R)
- M23: 3,000,484 km (0.093 R)
- M24: 3,179,404 km (0.056 R)
- M25: 3,392,880 km (0.116 R)
- M26: 3,666,345 km (0.085 R)
- M27: 3,801,880 km (0.098 R)
- M28: 3,947,140 km (0.084 R)
- M29: 4,061,433 km (0.085 R)
- M30: 4,160,317 km (0.074 R)
- M31: 4,343,724 km (0.113 R)
- M32: 4,419,420 km (0.083 R)
- M33: 4,632,448 km (0.099 R)
- M34: 4,761,850 km (0.028 R)
- M35: 4,901,125 km (0.106 R)
- M36: 5,148,411 km (0.082 R)
- M37: 5,273,624 km (0.063 R)
- M38: 5,372,658 km (0.107 R)
- M39: 5,454,189 km (0.098 R)
- M40: 5,581,796 km (0.051 R)
- M41: 5,664,374 km (0.12 R)
- M42: 5,840,151 km (0.097 R)
- M43: 5,970,750 km (0.059 R)
- M44: 6,083,547 km (0.106 R)
- M45: 6,168,668 km (0.077 R)
- M46: 6,263,513 km (0.054 R)
- M47: 6,416,552 km (0.118 R)
- M48: 6,522,467 km (0.092 R)
- M49: 6,599,809 km (0.112 R)
Planet 2 - Gas Giant
Semi-Major Axis: 1.34 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 884.4
Radius: 12
Gravity: 6.14 G
Time & Orbit
Eccentricity (e): 0.183
Orbit Range: 1.09 AU - 1.59 AU
Year: 1052 Days
Day: 13 Hours
Environment
Temp: -191 °C
Axial Tilt: 110.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (56)
Outer Limit: 29,594,142 km
- M1: 227,688 km (0.117 R)
- M2: 305,479 km (0.096 R)
- M3: 428,747 km (0.045 R)
- M4: 545,583 km (0.083 R)
- M5: 644,617 km (0.094 R)
- M6: 763,697 km (0.03 R)
- M7: 968,347 km (0.089 R)
- M8: 1,048,083 km (0.052 R)
- M9: 1,160,879 km (0.069 R)
- M10: 1,342,192 km (0.066 R)
- M11: 1,499,270 km (0.054 R)
- M12: 1,619,098 km (0.103 R)
- M13: 1,760,169 km (0.076 R)
- M14: 1,951,803 km (0.093 R)
- M15: 2,045,452 km (0.112 R)
- M16: 2,198,640 km (0.118 R)
- M17: 2,306,201 km (0.047 R)
- M18: 2,526,858 km (0.097 R)
- M19: 2,892,325 km (0.08 R)
- M20: 3,219,047 km (0.088 R)
- M21: 3,297,137 km (0.04 R)
- M22: 3,743,388 km (0.08 R)
- M23: 3,825,517 km (0.096 R)
- M24: 4,208,936 km (0.064 R)
- M25: 4,355,991 km (0.082 R)
- M26: 4,542,240 km (0.097 R)
- M27: 4,680,469 km (0.101 R)
- M28: 4,769,180 km (0.109 R)
- M29: 4,922,668 km (0.11 R)
- M30: 5,025,890 km (0.064 R)
- M31: 5,142,876 km (0.096 R)
- M32: 5,300,253 km (0.085 R)
- M33: 5,619,943 km (0.111 R)
- M34: 5,863,788 km (0.105 R)
- M35: 6,014,582 km (0.089 R)
- M36: 6,264,112 km (0.047 R)
- M37: 6,390,223 km (0.073 R)
- M38: 6,531,293 km (0.071 R)
- M39: 7,267,016 km (0.081 R)
- M40: 7,953,221 km (0.104 R)
- M41: 8,135,581 km (0.111 R)
- M42: 8,304,028 km (0.04 R)
- M43: 8,411,888 km (0.085 R)
- M44: 8,597,689 km (0.096 R)
- M45: 9,547,635 km (0.119 R)
- M46: 9,628,418 km (0.091 R)
- M47: 9,969,651 km (0.114 R)
- M48: 10,182,977 km (0.088 R)
- M49: 10,447,616 km (0.047 R)
- M50: 10,630,873 km (0.108 R)
- M51: 10,714,499 km (0.117 R)
- M52: 10,983,625 km (0.057 R)
- M53: 11,068,298 km (0.079 R)
- M54: 11,340,416 km (0.066 R)
- M55: 11,460,094 km (0.077 R)
- M56: 11,580,371 km (0.109 R)
Planet 3 - Gas Giant
Semi-Major Axis: 1.55 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 220.4
Radius: 12.2
Gravity: 1.48 G
Time & Orbit
Eccentricity (e): 0.212
Orbit Range: 1.22 AU - 1.88 AU
Year: 1309 Days
Day: 7 Hours
Environment
Temp: -202 °C
Axial Tilt: 36.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (46)
Outer Limit: 29,594,142 km
- M1: 152,440 km (0.091 R)
- M2: 332,855 km (0.09 R)
- M3: 455,077 km (0.096 R)
- M4: 582,684 km (0.048 R)
- M5: 664,065 km (0.104 R)
- M6: 770,878 km (0.098 R)
- M7: 940,522 km (0.106 R)
- M8: 1,123,330 km (0.118 R)
- M9: 1,497,624 km (0.093 R)
- M10: 1,586,934 km (0.064 R)
- M11: 1,735,186 km (0.099 R)
- M12: 1,903,184 km (0.083 R)
- M13: 2,122,644 km (0.082 R)
- M14: 2,545,707 km (0.106 R)
- M15: 2,762,923 km (0.068 R)
- M16: 2,934,362 km (0.083 R)
- M17: 3,074,087 km (0.117 R)
- M18: 3,305,814 km (0.094 R)
- M19: 3,387,494 km (0.117 R)
- M20: 3,488,174 km (0.111 R)
- M21: 3,589,900 km (0.107 R)
- M22: 3,730,223 km (0.086 R)
- M23: 4,074,448 km (0.096 R)
- M24: 4,299,892 km (0.1 R)
- M25: 4,379,328 km (0.064 R)
- M26: 4,509,329 km (0.073 R)
- M27: 4,691,539 km (0.059 R)
- M28: 4,773,369 km (0.088 R)
- M29: 4,876,292 km (0.065 R)
- M30: 5,084,383 km (0.077 R)
- M31: 5,263,751 km (0.052 R)
- M32: 5,380,736 km (0.112 R)
- M33: 5,487,998 km (0.069 R)
- M34: 5,596,008 km (0.118 R)
- M35: 5,835,963 km (0.073 R)
- M36: 5,946,216 km (0.081 R)
- M37: 6,057,068 km (0.034 R)
- M38: 6,281,016 km (0.034 R)
- M39: 6,587,841 km (0.076 R)
- M40: 6,887,785 km (0.116 R)
- M41: 7,180,548 km (0.069 R)
- M42: 7,382,057 km (0.11 R)
- M43: 7,513,403 km (0.085 R)
- M44: 7,609,445 km (0.046 R)
- M45: 7,693,818 km (0.12 R)
- M46: 8,181,807 km (0.108 R)
Planet 4 - Gas Giant
Semi-Major Axis: 1.91 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 95.6
Radius: 14.7
Gravity: 0.44 G
Time & Orbit
Eccentricity (e): 0.231
Orbit Range: 1.47 AU - 2.35 AU
Year: 1790 Days
Day: 13.8 Hours
Environment
Temp: -195 °C
Axial Tilt: 144 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (43)
Outer Limit: 29,594,142 km
- M1: 213,327 km (0.105 R)
- M2: 464,352 km (0.109 R)
- M3: 557,102 km (0.117 R)
- M4: 786,735 km (0.111 R)
- M5: 968,048 km (0.047 R)
- M6: 1,061,696 km (0.102 R)
- M7: 1,271,283 km (0.089 R)
- M8: 1,393,953 km (0.066 R)
- M9: 1,533,827 km (0.072 R)
- M10: 1,752,988 km (0.103 R)
- M11: 1,933,253 km (0.078 R)
- M12: 2,098,110 km (0.097 R)
- M13: 2,193,404 km (0.082 R)
- M14: 2,613,475 km (0.087 R)
- M15: 2,772,647 km (0.091 R)
- M16: 2,869,736 km (0.092 R)
- M17: 3,075,882 km (0.116 R)
- M18: 3,176,561 km (0.088 R)
- M19: 3,295,491 km (0.108 R)
- M20: 3,555,493 km (0.101 R)
- M21: 3,768,520 km (0.086 R)
- M22: 3,949,234 km (0.082 R)
- M23: 4,068,314 km (0.084 R)
- M24: 4,160,766 km (0.089 R)
- M25: 4,282,089 km (0.114 R)
- M26: 4,404,461 km (0.099 R)
- M27: 4,537,752 km (0.098 R)
- M28: 4,681,965 km (0.118 R)
- M29: 4,837,546 km (0.041 R)
- M30: 5,044,440 km (0.055 R)
- M31: 5,153,946 km (0.09 R)
- M32: 5,264,349 km (0.059 R)
- M33: 5,528,389 km (0.086 R)
- M34: 5,713,741 km (0.032 R)
- M35: 6,037,920 km (0.117 R)
- M36: 6,519,326 km (0.081 R)
- M37: 6,660,696 km (0.118 R)
- M38: 6,759,131 km (0.115 R)
- M39: 7,013,148 km (0.082 R)
- M40: 7,292,896 km (0.076 R)
- M41: 7,451,021 km (0.111 R)
- M42: 7,553,496 km (0.036 R)
- M43: 7,759,492 km (0.089 R)
Planet 5 - Gas Giant
Semi-Major Axis: 2.23 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 985.6
Radius: 12.7
Gravity: 6.11 G
Time & Orbit
Eccentricity (e): 0.079
Orbit Range: 2.05 AU - 2.41 AU
Year: 2259 Days
Day: 10.7 Hours
Environment
Temp: -214 °C
Axial Tilt: 35.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (74)
Outer Limit: 29,594,142 km
- M1: 205,996 km (0.049 R)
- M2: 436,078 km (0.041 R)
- M3: 660,175 km (0.066 R)
- M4: 740,958 km (0.104 R)
- M5: 996,023 km (0.097 R)
- M6: 1,167,611 km (0.116 R)
- M7: 1,280,109 km (0.096 R)
- M8: 1,885,681 km (0.12 R)
- M9: 1,965,716 km (0.097 R)
- M10: 2,074,174 km (0.102 R)
- M11: 2,340,010 km (0.036 R)
- M12: 3,092,338 km (0.113 R)
- M13: 3,251,510 km (0.049 R)
- M14: 3,380,762 km (0.117 R)
- M15: 3,578,082 km (0.109 R)
- M16: 3,694,918 km (0.104 R)
- M17: 4,192,780 km (0.09 R)
- M18: 4,621,078 km (0.111 R)
- M19: 4,840,538 km (0.05 R)
- M20: 5,007,490 km (0.118 R)
- M21: 5,119,838 km (0.073 R)
- M22: 5,577,607 km (0.107 R)
- M23: 5,694,293 km (0.109 R)
- M24: 5,850,922 km (0.09 R)
- M25: 6,148,622 km (0.054 R)
- M26: 6,390,372 km (0.093 R)
- M27: 6,532,789 km (0.09 R)
- M28: 6,738,187 km (0.061 R)
- M29: 7,113,379 km (0.078 R)
- M30: 7,324,761 km (0.107 R)
- M31: 7,474,059 km (0.106 R)
- M32: 7,884,257 km (0.045 R)
- M33: 7,993,463 km (0.068 R)
- M34: 8,390,645 km (0.062 R)
- M35: 8,479,806 km (0.074 R)
- M36: 8,726,642 km (0.091 R)
- M37: 8,975,872 km (0.097 R)
- M38: 9,090,015 km (0.103 R)
- M39: 9,273,572 km (0.094 R)
- M40: 9,481,513 km (0.061 R)
- M41: 9,644,276 km (0.076 R)
- M42: 9,808,085 km (0.095 R)
- M43: 10,019,916 km (0.087 R)
- M44: 10,114,611 km (0.116 R)
- M45: 10,713,152 km (0.106 R)
- M46: 10,931,416 km (0.079 R)
- M47: 11,644,848 km (0.117 R)
- M48: 11,919,510 km (0.105 R)
- M49: 12,322,676 km (0.114 R)
- M50: 12,756,061 km (0.061 R)
- M51: 12,858,835 km (0.092 R)
- M52: 13,298,353 km (0.115 R)
- M53: 13,848,125 km (0.108 R)
- M54: 13,980,220 km (0.067 R)
- M55: 14,086,136 km (0.09 R)
- M56: 14,245,457 km (0.1 R)
- M57: 14,566,045 km (0.12 R)
- M58: 14,754,090 km (0.1 R)
- M59: 15,323,310 km (0.074 R)
- M60: 15,459,893 km (0.07 R)
- M61: 15,596,924 km (0.105 R)
- M62: 15,927,386 km (0.093 R)
- M63: 16,371,542 km (0.029 R)
- M64: 16,819,887 km (0.078 R)
- M65: 17,785,840 km (0.118 R)
- M66: 17,958,177 km (0.077 R)
- M67: 18,188,857 km (0.107 R)
- M68: 18,478,628 km (0.079 R)
- M69: 18,740,724 km (0.1 R)
- M70: 18,945,374 km (0.057 R)
- M71: 19,504,720 km (0.088 R)
- M72: 19,623,201 km (0.107 R)
- M73: 19,890,533 km (0.058 R)
- M74: 19,979,992 km (0.086 R)
Planet 6 - Gas Giant
Semi-Major Axis: 3.66 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 391.5
Radius: 13.5
Gravity: 2.15 G
Time & Orbit
Eccentricity (e): 0.212
Orbit Range: 2.88 AU - 4.44 AU
Year: 4749 Days
Day: 6 Hours
Environment
Temp: -225 °C
Axial Tilt: 13.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (69)
Outer Limit: 29,594,142 km
- M1: 185,053 km (0.069 R)
- M2: 318,643 km (0.09 R)
- M3: 428,747 km (0.07 R)
- M4: 584,928 km (0.101 R)
- M5: 806,333 km (0.085 R)
- M6: 939,774 km (0.076 R)
- M7: 1,217,876 km (0.039 R)
- M8: 1,413,999 km (0.066 R)
- M9: 1,523,056 km (0.06 R)
- M10: 1,706,762 km (0.095 R)
- M11: 1,823,598 km (0.116 R)
- M12: 2,785,662 km (0.067 R)
- M13: 2,889,632 km (0.112 R)
- M14: 3,227,873 km (0.105 R)
- M15: 3,485,331 km (0.101 R)
- M16: 3,654,526 km (0.066 R)
- M17: 4,278,050 km (0.099 R)
- M18: 4,479,858 km (0.065 R)
- M19: 5,601,543 km (0.081 R)
- M20: 6,069,335 km (0.087 R)
- M21: 6,296,724 km (0.034 R)
- M22: 6,457,392 km (0.116 R)
- M23: 6,573,181 km (0.083 R)
- M24: 7,138,062 km (0.075 R)
- M25: 7,866,305 km (0.072 R)
- M26: 8,139,321 km (0.064 R)
- M27: 8,339,932 km (0.119 R)
- M28: 8,592,902 km (0.09 R)
- M29: 9,002,949 km (0.112 R)
- M30: 10,083,046 km (0.083 R)
- M31: 10,244,462 km (0.029 R)
- M32: 10,352,621 km (0.071 R)
- M33: 10,679,493 km (0.064 R)
- M34: 11,511,257 km (0.097 R)
- M35: 11,793,249 km (0.088 R)
- M36: 12,134,631 km (0.116 R)
- M37: 12,249,074 km (0.057 R)
- M38: 12,392,688 km (0.12 R)
- M39: 12,681,711 km (0.099 R)
- M40: 13,681,024 km (0.077 R)
- M41: 13,800,254 km (0.059 R)
- M42: 13,889,863 km (0.117 R)
- M43: 14,280,613 km (0.062 R)
- M44: 14,674,953 km (0.111 R)
- M45: 14,797,025 km (0.066 R)
- M46: 14,888,878 km (0.099 R)
- M47: 15,381,653 km (0.105 R)
- M48: 15,474,553 km (0.117 R)
- M49: 15,692,218 km (0.094 R)
- M50: 15,879,664 km (0.095 R)
- M51: 16,193,670 km (0.077 R)
- M52: 16,573,350 km (0.052 R)
- M53: 16,987,736 km (0.072 R)
- M54: 17,180,268 km (0.041 R)
- M55: 17,341,236 km (0.05 R)
- M56: 17,599,741 km (0.057 R)
- M57: 17,794,517 km (0.069 R)
- M58: 17,990,042 km (0.047 R)
- M59: 18,284,600 km (0.102 R)
- M60: 18,613,865 km (0.054 R)
- M61: 19,411,820 km (0.108 R)
- M62: 20,085,459 km (0.097 R)
- M63: 20,425,196 km (0.117 R)
- M64: 20,595,737 km (0.096 R)
- M65: 20,835,393 km (0.106 R)
- M66: 21,317,248 km (0.115 R)
- M67: 21,455,626 km (0.102 R)
- M68: 21,802,992 km (0.088 R)
- M69: 22,820,557 km (0.103 R)
Planet 7 - Gas Giant
Semi-Major Axis: 4.17 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 483.3
Radius: 14.8
Gravity: 2.21 G
Time & Orbit
Eccentricity (e): 0.169
Orbit Range: 3.47 AU - 4.87 AU
Year: 5776 Days
Day: 5.3 Hours
Environment
Temp: -210 °C
Axial Tilt: 32.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (78)
Outer Limit: 29,594,142 km
- M1: 344,524 km (0.118 R)
- M2: 446,250 km (0.11 R)
- M3: 553,063 km (0.104 R)
- M4: 682,765 km (0.116 R)
- M5: 887,265 km (0.085 R)
- M6: 1,031,627 km (0.1 R)
- M7: 1,301,202 km (0.065 R)
- M8: 1,626,727 km (0.074 R)
- M9: 1,926,970 km (0.103 R)
- M10: 2,048,743 km (0.092 R)
- M11: 2,191,160 km (0.086 R)
- M12: 2,337,168 km (0.053 R)
- M13: 2,974,006 km (0.097 R)
- M14: 3,364,905 km (0.103 R)
- M15: 3,794,400 km (0.104 R)
- M16: 4,015,805 km (0.072 R)
- M17: 4,196,071 km (0.101 R)
- M18: 4,776,959 km (0.069 R)
- M19: 4,968,444 km (0.108 R)
- M20: 5,113,554 km (0.069 R)
- M21: 5,532,877 km (0.049 R)
- M22: 5,734,086 km (0.103 R)
- M23: 6,117,805 km (0.119 R)
- M24: 6,457,392 km (0.075 R)
- M25: 6,776,335 km (0.11 R)
- M26: 7,155,117 km (0.043 R)
- M27: 7,680,205 km (0.097 R)
- M28: 8,160,713 km (0.08 R)
- M29: 9,002,949 km (0.072 R)
- M30: 9,509,637 km (0.09 R)
- M31: 9,630,213 km (0.092 R)
- M32: 10,644,487 km (0.075 R)
- M33: 10,864,097 km (0.114 R)
- M34: 11,148,632 km (0.101 R)
- M35: 11,275,790 km (0.115 R)
- M36: 12,212,871 km (0.068 R)
- M37: 12,541,837 km (0.09 R)
- M38: 13,546,237 km (0.065 R)
- M39: 13,750,288 km (0.097 R)
- M40: 13,852,613 km (0.082 R)
- M41: 14,680,937 km (0.111 R)
- M42: 16,132,934 km (0.116 R)
- M43: 16,385,305 km (0.119 R)
- M44: 16,566,468 km (0.096 R)
- M45: 16,857,735 km (0.106 R)
- M46: 17,004,042 km (0.116 R)
- M47: 17,150,648 km (0.08 R)
- M48: 17,297,852 km (0.081 R)
- M49: 17,890,409 km (0.052 R)
- M50: 18,039,708 km (0.092 R)
- M51: 18,151,906 km (0.112 R)
- M52: 18,301,804 km (0.099 R)
- M53: 18,414,600 km (0.101 R)
- M54: 18,943,728 km (0.092 R)
- M55: 19,746,769 km (0.095 R)
- M56: 20,327,209 km (0.029 R)
- M57: 20,444,045 km (0.115 R)
- M58: 20,639,121 km (0.062 R)
- M59: 21,307,225 km (0.098 R)
- M60: 21,425,856 km (0.109 R)
- M61: 21,584,280 km (0.075 R)
- M62: 21,782,946 km (0.039 R)
- M63: 22,463,167 km (0.077 R)
- M64: 22,583,893 km (0.075 R)
- M65: 22,866,483 km (0.11 R)
- M66: 23,313,033 km (0.1 R)
- M67: 23,598,615 km (0.119 R)
- M68: 23,762,425 km (0.109 R)
- M69: 24,214,659 km (0.107 R)
- M70: 24,421,104 km (0.12 R)
- M71: 25,546,380 km (0.108 R)
- M72: 25,714,528 km (0.033 R)
- M73: 26,688,559 km (0.095 R)
- M74: 27,933,812 km (0.103 R)
- M75: 28,237,196 km (0.067 R)
- M76: 28,934,921 km (0.08 R)
- M77: 29,154,082 km (0.058 R)
- M78: 29,505,936 km (0.112 R)
Kuiper Belt
Range: 30 - 57 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 443 - 16,312 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.