Star System Generated (Seed: 1767992758)
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 (6 Planets)
Asteroid Belt
Center: 0.51 AU
Composition
Type: Main (Rocky/Icy Mix)
A dense region of planetesimals and debris.
Boundary
Planet 1 - Gas Giant
Semi-Major Axis: 1.01 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 648.1
Radius: 11.4
Gravity: 4.99 G
Time & Orbit
Eccentricity (e): 0.244
Orbit Range: 0.76 AU - 1.26 AU
Year: 688 Days
Day: 9.7 Hours
Environment
Temp: -179 °C
Axial Tilt: 0 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (53)
Outer Limit: 41,248,605 km
- M1: 154,684 km (0.102 R)
- M2: 241,900 km (0.099 R)
- M3: 444,455 km (0.109 R)
- M4: 539,749 km (0.08 R)
- M5: 615,446 km (0.077 R)
- M6: 705,204 km (0.072 R)
- M7: 810,222 km (0.052 R)
- M8: 992,432 km (0.102 R)
- M9: 1,094,608 km (0.115 R)
- M10: 1,182,721 km (0.114 R)
- M11: 1,316,611 km (0.101 R)
- M12: 1,430,006 km (0.061 R)
- M13: 1,694,345 km (0.059 R)
- M14: 1,797,568 km (0.117 R)
- M15: 1,895,854 km (0.087 R)
- M16: 1,974,542 km (0.06 R)
- M17: 2,046,948 km (0.118 R)
- M18: 2,120,251 km (0.095 R)
- M19: 2,224,520 km (0.044 R)
- M20: 2,307,697 km (0.065 R)
- M21: 2,384,291 km (0.099 R)
- M22: 2,461,633 km (0.068 R)
- M23: 2,563,659 km (0.118 R)
- M24: 2,739,436 km (0.097 R)
- M25: 3,027,412 km (0.097 R)
- M26: 3,136,918 km (0.046 R)
- M27: 3,368,645 km (0.078 R)
- M28: 3,464,687 km (0.096 R)
- M29: 3,731,420 km (0.12 R)
- M30: 4,041,985 km (0.075 R)
- M31: 4,144,160 km (0.083 R)
- M32: 4,237,958 km (0.112 R)
- M33: 4,649,053 km (0.053 R)
- M34: 4,726,994 km (0.1 R)
- M35: 4,854,601 km (0.049 R)
- M36: 4,943,611 km (0.095 R)
- M37: 5,083,186 km (0.087 R)
- M38: 5,163,520 km (0.055 R)
- M39: 5,254,476 km (0.097 R)
- M40: 5,417,388 km (0.096 R)
- M41: 5,520,161 km (0.093 R)
- M42: 5,748,448 km (0.083 R)
- M43: 5,979,726 km (0.089 R)
- M44: 6,149,968 km (0.083 R)
- M45: 6,225,067 km (0.104 R)
- M46: 6,506,311 km (0.092 R)
- M47: 6,615,517 km (0.08 R)
- M48: 6,824,954 km (0.12 R)
- M49: 7,069,995 km (0.098 R)
- M50: 7,216,302 km (0.044 R)
- M51: 7,374,876 km (0.101 R)
- M52: 7,523,277 km (0.086 R)
- M53: 7,718,801 km (0.105 R)
Planet 2 - Gas Giant
Semi-Major Axis: 1.55 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 247.7
Radius: 11.8
Gravity: 1.78 G
Time & Orbit
Eccentricity (e): 0.121
Orbit Range: 1.36 AU - 1.74 AU
Year: 1309 Days
Day: 14.3 Hours
Environment
Temp: -203 °C
Axial Tilt: 9.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (53)
Outer Limit: 41,248,605 km
- M1: 148,999 km (0.048 R)
- M2: 229,334 km (0.104 R)
- M3: 680,072 km (0.058 R)
- M4: 796,758 km (0.119 R)
- M5: 956,080 km (0.11 R)
- M6: 1,058,255 km (0.104 R)
- M7: 1,202,916 km (0.079 R)
- M8: 1,281,156 km (0.085 R)
- M9: 1,429,258 km (0.11 R)
- M10: 1,519,615 km (0.111 R)
- M11: 1,698,983 km (0.098 R)
- M12: 1,795,174 km (0.118 R)
- M13: 2,039,917 km (0.054 R)
- M14: 2,320,263 km (0.06 R)
- M15: 2,461,035 km (0.099 R)
- M16: 2,545,109 km (0.068 R)
- M17: 2,647,434 km (0.049 R)
- M18: 2,856,272 km (0.106 R)
- M19: 2,998,540 km (0.059 R)
- M20: 3,088,598 km (0.118 R)
- M21: 3,225,629 km (0.097 R)
- M22: 3,308,806 km (0.082 R)
- M23: 3,439,554 km (0.12 R)
- M24: 3,667,990 km (0.109 R)
- M25: 3,754,907 km (0.075 R)
- M26: 3,921,110 km (0.047 R)
- M27: 4,019,994 km (0.05 R)
- M28: 4,301,388 km (0.068 R)
- M29: 4,393,091 km (0.1 R)
- M30: 4,506,337 km (0.044 R)
- M31: 4,641,274 km (0.074 R)
- M32: 4,745,992 km (0.062 R)
- M33: 4,830,515 km (0.086 R)
- M34: 5,043,692 km (0.11 R)
- M35: 5,249,090 km (0.037 R)
- M36: 5,358,297 km (0.101 R)
- M37: 5,523,602 km (0.104 R)
- M38: 5,657,193 km (0.108 R)
- M39: 6,052,730 km (0.118 R)
- M40: 6,144,433 km (0.107 R)
- M41: 6,259,624 km (0.114 R)
- M42: 6,422,237 km (0.109 R)
- M43: 6,539,222 km (0.12 R)
- M44: 6,990,409 km (0.11 R)
- M45: 7,098,718 km (0.068 R)
- M46: 7,231,860 km (0.103 R)
- M47: 7,537,638 km (0.099 R)
- M48: 7,723,289 km (0.093 R)
- M49: 8,136,778 km (0.035 R)
- M50: 8,225,489 km (0.12 R)
- M51: 8,531,866 km (0.096 R)
- M52: 8,647,804 km (0.098 R)
- M53: 8,803,087 km (0.115 R)
Planet 3 - Gas Giant
Semi-Major Axis: 1.61 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 618.6
Radius: 10.9
Gravity: 5.21 G
Time & Orbit
Eccentricity (e): 0.091
Orbit Range: 1.46 AU - 1.76 AU
Year: 1386 Days
Day: 14.5 Hours
Environment
Temp: -199 °C
Axial Tilt: 6.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (69)
Outer Limit: 41,248,605 km
- M1: 158,125 km (0.116 R)
- M2: 241,152 km (0.077 R)
- M3: 315,951 km (0.079 R)
- M4: 407,953 km (0.115 R)
- M5: 589,266 km (0.112 R)
- M6: 658,380 km (0.075 R)
- M7: 750,981 km (0.104 R)
- M8: 913,445 km (0.065 R)
- M9: 1,010,833 km (0.108 R)
- M10: 1,096,104 km (0.095 R)
- M11: 1,333,216 km (0.103 R)
- M12: 1,506,750 km (0.119 R)
- M13: 1,687,763 km (0.104 R)
- M14: 1,809,386 km (0.027 R)
- M15: 1,924,427 km (0.086 R)
- M16: 2,012,241 km (0.118 R)
- M17: 2,304,854 km (0.101 R)
- M18: 2,493,497 km (0.104 R)
- M19: 2,643,694 km (0.115 R)
- M20: 2,752,900 km (0.066 R)
- M21: 3,044,017 km (0.116 R)
- M22: 3,286,366 km (0.114 R)
- M23: 3,451,522 km (0.099 R)
- M24: 3,535,297 km (0.1 R)
- M25: 3,753,560 km (0.086 R)
- M26: 3,827,312 km (0.086 R)
- M27: 3,926,346 km (0.084 R)
- M28: 4,076,692 km (0.116 R)
- M29: 4,228,833 km (0.106 R)
- M30: 4,473,724 km (0.089 R)
- M31: 4,896,787 km (0.105 R)
- M32: 5,113,255 km (0.076 R)
- M33: 5,222,611 km (0.095 R)
- M34: 5,457,630 km (0.087 R)
- M35: 5,924,076 km (0.082 R)
- M36: 6,067,839 km (0.035 R)
- M37: 6,169,267 km (0.104 R)
- M38: 6,285,953 km (0.106 R)
- M39: 6,432,708 km (0.085 R)
- M40: 6,804,609 km (0.112 R)
- M41: 6,940,294 km (0.112 R)
- M42: 7,460,895 km (0.108 R)
- M43: 7,694,566 km (0.069 R)
- M44: 7,788,664 km (0.094 R)
- M45: 7,994,061 km (0.113 R)
- M46: 8,233,268 km (0.066 R)
- M47: 8,393,937 km (0.061 R)
- M48: 8,882,523 km (0.052 R)
- M49: 9,030,924 km (0.104 R)
- M50: 9,246,794 km (0.03 R)
- M51: 9,413,895 km (0.118 R)
- M52: 9,615,852 km (0.12 R)
- M53: 10,006,901 km (0.045 R)
- M54: 10,127,028 km (0.088 R)
- M55: 10,247,604 km (0.071 R)
- M56: 10,333,922 km (0.054 R)
- M57: 10,438,042 km (0.088 R)
- M58: 10,524,958 km (0.115 R)
- M59: 10,717,042 km (0.074 R)
- M60: 10,839,862 km (0.045 R)
- M61: 11,033,890 km (0.12 R)
- M62: 11,497,195 km (0.105 R)
- M63: 11,569,002 km (0.106 R)
- M64: 11,677,011 km (0.028 R)
- M65: 11,749,267 km (0.106 R)
- M66: 12,003,135 km (0.045 R)
- M67: 12,112,491 km (0.106 R)
- M68: 12,185,644 km (0.117 R)
- M69: 12,332,250 km (0.085 R)
Planet 4 - Gas Giant
Semi-Major Axis: 4.54 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 654.8
Radius: 10
Gravity: 6.55 G
Time & Orbit
Eccentricity (e): 0.138
Orbit Range: 3.91 AU - 5.17 AU
Year: 6561 Days
Day: 10.9 Hours
Environment
Temp: -220 °C
Axial Tilt: 25 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (85)
Outer Limit: 41,248,605 km
- M1: 217,366 km (0.119 R)
- M2: 387,608 km (0.078 R)
- M3: 1,036,115 km (0.098 R)
- M4: 1,197,681 km (0.098 R)
- M5: 1,367,923 km (0.108 R)
- M6: 1,713,344 km (0.106 R)
- M7: 2,355,718 km (0.078 R)
- M8: 2,483,923 km (0.044 R)
- M9: 2,614,672 km (0.049 R)
- M10: 2,792,394 km (0.097 R)
- M11: 3,020,381 km (0.077 R)
- M12: 3,136,768 km (0.068 R)
- M13: 3,422,051 km (0.075 R)
- M14: 3,815,494 km (0.117 R)
- M15: 3,890,891 km (0.1 R)
- M16: 4,353,896 km (0.107 R)
- M17: 4,432,884 km (0.036 R)
- M18: 4,672,390 km (0.036 R)
- M19: 5,108,767 km (0.113 R)
- M20: 5,933,052 km (0.075 R)
- M21: 6,405,482 km (0.085 R)
- M22: 6,495,390 km (0.093 R)
- M23: 6,585,747 km (0.102 R)
- M24: 6,767,808 km (0.084 R)
- M25: 6,890,029 km (0.043 R)
- M26: 7,355,129 km (0.077 R)
- M27: 7,480,941 km (0.079 R)
- M28: 7,926,742 km (0.082 R)
- M29: 8,152,785 km (0.096 R)
- M30: 8,348,309 km (0.073 R)
- M31: 8,413,983 km (0.103 R)
- M32: 8,512,568 km (0.07 R)
- M33: 8,910,797 km (0.083 R)
- M34: 9,011,477 km (0.111 R)
- M35: 9,112,306 km (0.097 R)
- M36: 9,485,702 km (0.064 R)
- M37: 9,863,885 km (0.116 R)
- M38: 10,352,621 km (0.055 R)
- M39: 11,100,461 km (0.036 R)
- M40: 11,718,600 km (0.079 R)
- M41: 12,347,808 km (0.114 R)
- M42: 12,497,556 km (0.1 R)
- M43: 13,446,605 km (0.066 R)
- M44: 13,755,225 km (0.037 R)
- M45: 14,066,239 km (0.111 R)
- M46: 15,052,837 km (0.065 R)
- M47: 15,292,942 km (0.113 R)
- M48: 15,615,175 km (0.093 R)
- M49: 16,061,725 km (0.118 R)
- M50: 18,485,510 km (0.109 R)
- M51: 18,571,080 km (0.093 R)
- M52: 18,742,818 km (0.058 R)
- M53: 18,828,687 km (0.101 R)
- M54: 19,130,725 km (0.098 R)
- M55: 19,304,109 km (0.063 R)
- M56: 19,870,936 km (0.068 R)
- M57: 20,620,421 km (0.09 R)
- M58: 20,842,723 km (0.104 R)
- M59: 21,110,354 km (0.098 R)
- M60: 21,514,119 km (0.113 R)
- M61: 21,739,563 km (0.049 R)
- M62: 22,056,411 km (0.025 R)
- M63: 22,374,755 km (0.097 R)
- M64: 22,557,414 km (0.075 R)
- M65: 23,154,459 km (0.113 R)
- M66: 23,803,116 km (0.07 R)
- M67: 23,896,315 km (0.105 R)
- M68: 24,270,160 km (0.088 R)
- M69: 25,355,792 km (0.077 R)
- M70: 25,832,710 km (0.044 R)
- M71: 26,024,345 km (0.107 R)
- M72: 27,135,259 km (0.062 R)
- M73: 27,770,002 km (0.062 R)
- M74: 27,966,424 km (0.107 R)
- M75: 28,805,818 km (0.102 R)
- M76: 29,303,381 km (0.065 R)
- M77: 29,453,278 km (0.116 R)
- M78: 31,016,575 km (0.073 R)
- M79: 31,629,029 km (0.092 R)
- M80: 31,988,064 km (0.056 R)
- M81: 32,813,844 km (0.093 R)
- M82: 33,177,367 km (0.094 R)
- M83: 34,961,920 km (0.078 R)
- M84: 35,333,222 km (0.098 R)
- M85: 35,545,950 km (0.045 R)
Planet 5 - Gas Giant
Semi-Major Axis: 5.33 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 500
Radius: 8.5
Gravity: 6.92 G
Time & Orbit
Eccentricity (e): 0.137
Orbit Range: 4.6 AU - 6.06 AU
Year: 8346 Days
Day: 5.7 Hours
Environment
Temp: -220 °C
Axial Tilt: 34.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (88)
Outer Limit: 41,248,605 km
- M1: 109,057 km (0.047 R)
- M2: 175,777 km (0.11 R)
- M3: 858,243 km (0.03 R)
- M4: 1,018,014 km (0.045 R)
- M5: 1,632,562 km (0.096 R)
- M6: 1,914,703 km (0.113 R)
- M7: 2,040,365 km (0.097 R)
- M8: 2,104,244 km (0.053 R)
- M9: 2,388,928 km (0.107 R)
- M10: 2,570,391 km (0.109 R)
- M11: 2,639,505 km (0.026 R)
- M12: 2,898,758 km (0.057 R)
- M13: 3,116,872 km (0.074 R)
- M14: 3,315,388 km (0.111 R)
- M15: 3,751,017 km (0.087 R)
- M16: 4,123,366 km (0.03 R)
- M17: 4,396,532 km (0.049 R)
- M18: 4,703,955 km (0.098 R)
- M19: 4,874,647 km (0.106 R)
- M20: 5,222,162 km (0.07 R)
- M21: 5,280,805 km (0.099 R)
- M22: 5,369,217 km (0.072 R)
- M23: 5,547,687 km (0.099 R)
- M24: 5,758,321 km (0.099 R)
- M25: 5,940,980 km (0.119 R)
- M26: 6,343,399 km (0.116 R)
- M27: 6,722,629 km (0.105 R)
- M28: 7,076,727 km (0.084 R)
- M29: 7,338,075 km (0.051 R)
- M30: 7,404,047 km (0.032 R)
- M31: 7,702,794 km (0.028 R)
- M32: 8,005,431 km (0.114 R)
- M33: 8,073,348 km (0.102 R)
- M34: 8,415,179 km (0.052 R)
- M35: 8,622,672 km (0.108 R)
- M36: 8,761,947 km (0.11 R)
- M37: 10,084,991 km (0.061 R)
- M38: 10,194,945 km (0.079 R)
- M39: 12,516,704 km (0.074 R)
- M40: 12,595,393 km (0.067 R)
- M41: 12,832,805 km (0.113 R)
- M42: 13,715,881 km (0.117 R)
- M43: 14,452,949 km (0.07 R)
- M44: 14,701,581 km (0.079 R)
- M45: 14,951,559 km (0.081 R)
- M46: 15,922,749 km (0.044 R)
- M47: 16,870,750 km (0.105 R)
- M48: 18,506,005 km (0.108 R)
- M49: 18,730,850 km (0.109 R)
- M50: 18,956,593 km (0.054 R)
- M51: 19,092,578 km (0.099 R)
- M52: 19,319,667 km (0.096 R)
- M53: 19,547,804 km (0.088 R)
- M54: 20,052,847 km (0.1 R)
- M55: 20,237,450 km (0.035 R)
- M56: 21,310,516 km (0.109 R)
- M57: 21,925,064 km (0.069 R)
- M58: 22,163,074 km (0.074 R)
- M59: 23,317,072 km (0.076 R)
- M60: 23,462,631 km (0.119 R)
- M61: 23,852,483 km (0.095 R)
- M62: 24,441,151 km (0.106 R)
- M63: 24,985,088 km (0.106 R)
- M64: 25,383,168 km (0.098 R)
- M65: 25,482,950 km (0.065 R)
- M66: 25,733,227 km (0.034 R)
- M67: 26,034,517 km (0.1 R)
- M68: 26,185,611 km (0.032 R)
- M69: 26,387,568 km (0.107 R)
- M70: 26,589,974 km (0.11 R)
- M71: 26,945,419 km (0.067 R)
- M72: 27,712,407 km (0.092 R)
- M73: 28,850,398 km (0.116 R)
- M74: 29,268,075 km (0.09 R)
- M75: 31,171,858 km (0.043 R)
- M76: 31,332,376 km (0.083 R)
- M77: 32,625,800 km (0.108 R)
- M78: 32,680,104 km (0.084 R)
- M79: 33,170,037 km (0.063 R)
- M80: 34,487,994 km (0.081 R)
- M81: 34,598,696 km (0.061 R)
- M82: 34,875,752 km (0.075 R)
- M83: 35,767,205 km (0.096 R)
- M84: 35,879,254 km (0.094 R)
- M85: 36,047,402 km (0.07 R)
- M86: 36,722,687 km (0.105 R)
- M87: 37,288,616 km (0.117 R)
- M88: 37,800,390 km (0.107 R)
Planet 6 - Ice Giant
Semi-Major Axis: 6.71 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 314.1
Radius: 6.3
Gravity: 7.91 G
Time & Orbit
Eccentricity (e): 0.105
Orbit Range: 6.01 AU - 7.41 AU
Year: 11789 Days
Day: 22.1 Hours
Environment
Temp: -221 °C
Axial Tilt: 23.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (75)
Outer Limit: 41,248,605 km
- M1: 161,715 km (0.101 R)
- M2: 511,326 km (0.075 R)
- M3: 609,462 km (0.069 R)
- M4: 1,360,742 km (0.116 R)
- M5: 1,726,060 km (0.09 R)
- M6: 1,768,396 km (0.102 R)
- M7: 1,985,912 km (0.107 R)
- M8: 2,304,705 km (0.082 R)
- M9: 2,446,224 km (0.082 R)
- M10: 2,542,266 km (0.096 R)
- M11: 3,170,128 km (0.102 R)
- M12: 4,068,613 km (0.105 R)
- M13: 4,297,797 km (0.114 R)
- M14: 4,828,421 km (0.103 R)
- M15: 4,949,296 km (0.118 R)
- M16: 6,775,736 km (0.107 R)
- M17: 6,911,122 km (0.087 R)
- M18: 8,240,449 km (0.055 R)
- M19: 8,530,220 km (0.096 R)
- M20: 8,603,224 km (0.03 R)
- M21: 8,860,233 km (0.034 R)
- M22: 9,082,536 km (0.114 R)
- M23: 10,965,823 km (0.11 R)
- M24: 11,364,651 km (0.112 R)
- M25: 11,930,879 km (0.089 R)
- M26: 12,094,389 km (0.105 R)
- M27: 12,797,499 km (0.105 R)
- M28: 14,416,448 km (0.11 R)
- M29: 14,896,956 km (0.057 R)
- M30: 15,161,445 km (0.109 R)
- M31: 15,739,491 km (0.077 R)
- M32: 15,963,738 km (0.099 R)
- M33: 16,234,211 km (0.116 R)
- M34: 16,324,718 km (0.101 R)
- M35: 17,285,136 km (0.082 R)
- M36: 17,377,588 km (0.074 R)
- M37: 17,423,963 km (0.071 R)
- M38: 18,878,653 km (0.109 R)
- M39: 19,500,232 km (0.03 R)
- M40: 20,763,586 km (0.107 R)
- M41: 20,910,940 km (0.071 R)
- M42: 21,504,245 km (0.11 R)
- M43: 21,802,992 km (0.117 R)
- M44: 21,852,958 km (0.12 R)
- M45: 22,153,350 km (0.107 R)
- M46: 22,354,260 km (0.116 R)
- M47: 23,011,593 km (0.109 R)
- M48: 24,035,291 km (0.109 R)
- M49: 24,241,886 km (0.077 R)
- M50: 25,230,878 km (0.066 R)
- M51: 25,283,387 km (0.117 R)
- M52: 25,335,746 km (0.104 R)
- M53: 26,979,826 km (0.078 R)
- M54: 27,033,382 km (0.055 R)
- M55: 27,248,205 km (0.109 R)
- M56: 28,494,206 km (0.038 R)
- M57: 29,096,636 km (0.051 R)
- M58: 29,206,591 km (0.072 R)
- M59: 29,261,643 km (0.051 R)
- M60: 29,980,311 km (0.104 R)
- M61: 30,537,264 km (0.119 R)
- M62: 31,830,837 km (0.086 R)
- M63: 32,285,016 km (0.106 R)
- M64: 35,230,149 km (0.113 R)
- M65: 35,817,620 km (0.041 R)
- M66: 36,171,718 km (0.082 R)
- M67: 36,289,900 km (0.092 R)
- M68: 36,823,815 km (0.083 R)
- M69: 37,002,285 km (0.094 R)
- M70: 37,181,055 km (0.103 R)
- M71: 37,599,480 km (0.08 R)
- M72: 38,440,818 km (0.105 R)
- M73: 39,531,686 km (0.111 R)
- M74: 40,571,242 km (0.104 R)
- M75: 41,125,203 km (0.09 R)
Kuiper Belt
Range: 30 - 56 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 349 - 16,973 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.