G8V Star System Generated (Seed: 1766170309)
Star Details
Spectral Class: G2V
Temperature: 5,800 K
Mass: 1.05 sol
Luminosity: 1.19 lux
Habitable Zone (HZ)
Inner Boundary: 1.04 AU
Outer Boundary: 1.5 AU
Physical Limits
Snow Line: 5.24 AU
Max System Radius: 20.5 AU
Planetary System (6 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 1.68 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 4.8
Radius: 1.87
Gravity: 1.37 G
Time & Orbit
Eccentricity (e): 0.217
Orbit Range: 1.32 AU - 2.04 AU
Year: 776 Days
Day: 17.6 Hours
Environment
Temp: -41 °C
Axial Tilt: 15 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Satellites (1)
Outer Limit: 57,496,387 km
- M1: 213,626 km (0.074 R)
Planet 2 - Gas Giant
Semi-Major Axis: 5.31 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 158
Radius: 8.9
Gravity: 1.99 G
Time & Orbit
Eccentricity (e): 0.173
Orbit Range: 4.39 AU - 6.23 AU
Year: 4362 Days
Day: 13.4 Hours
Environment
Temp: -145 °C
Axial Tilt: 34.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (77)
Outer Limit: 57,496,387 km
- M1: 116,686 km (0.116 R)
- M2: 173,085 km (0.094 R)
- M3: 230,231 km (0.1 R)
- M4: 287,378 km (0.053 R)
- M5: 388,954 km (0.08 R)
- M6: 512,373 km (0.09 R)
- M7: 657,782 km (0.104 R)
- M8: 765,642 km (0.082 R)
- M9: 925,263 km (0.112 R)
- M10: 990,488 km (0.075 R)
- M11: 1,319,304 km (0.112 R)
- M12: 1,501,663 km (0.093 R)
- M13: 1,867,430 km (0.117 R)
- M14: 2,085,394 km (0.079 R)
- M15: 2,159,894 km (0.076 R)
- M16: 2,273,439 km (0.117 R)
- M17: 2,401,943 km (0.045 R)
- M18: 3,051,797 km (0.062 R)
- M19: 3,179,553 km (0.05 R)
- M20: 3,280,233 km (0.102 R)
- M21: 3,338,127 km (0.068 R)
- M22: 3,455,112 km (0.08 R)
- M23: 3,723,491 km (0.099 R)
- M24: 3,783,929 km (0.119 R)
- M25: 3,921,409 km (0.108 R)
- M26: 4,169,891 km (0.092 R)
- M27: 4,264,437 km (0.105 R)
- M28: 4,536,107 km (0.118 R)
- M29: 4,747,788 km (0.065 R)
- M30: 4,813,461 km (0.077 R)
- M31: 5,012,725 km (0.09 R)
- M32: 5,214,533 km (0.059 R)
- M33: 5,591,669 km (0.1 R)
- M34: 5,959,979 km (0.109 R)
- M35: 6,499,728 km (0.066 R)
- M36: 6,572,882 km (0.093 R)
- M37: 6,849,638 km (0.086 R)
- M38: 7,243,529 km (0.103 R)
- M39: 7,568,007 km (0.101 R)
- M40: 7,799,734 km (0.049 R)
- M41: 7,897,122 km (0.078 R)
- M42: 8,112,543 km (0.053 R)
- M43: 8,230,875 km (0.073 R)
- M44: 8,290,265 km (0.111 R)
- M45: 8,589,311 km (0.111 R)
- M46: 9,054,860 km (0.11 R)
- M47: 9,177,680 km (0.095 R)
- M48: 9,301,098 km (0.107 R)
- M49: 9,674,494 km (0.077 R)
- M50: 9,800,007 km (0.074 R)
- M51: 9,926,118 km (0.085 R)
- M52: 10,543,209 km (0.03 R)
- M53: 10,694,153 km (0.117 R)
- M54: 11,636,321 km (0.068 R)
- M55: 11,725,332 km (0.053 R)
- M56: 11,926,391 km (0.086 R)
- M57: 12,038,589 km (0.104 R)
- M58: 12,196,266 km (0.119 R)
- M59: 12,264,033 km (0.077 R)
- M60: 12,536,451 km (0.094 R)
- M61: 13,133,646 km (0.106 R)
- M62: 13,295,960 km (0.093 R)
- M63: 13,412,347 km (0.027 R)
- M64: 13,505,696 km (0.043 R)
- M65: 13,881,186 km (0.066 R)
- M66: 14,023,005 km (0.107 R)
- M67: 14,141,337 km (0.114 R)
- M68: 14,331,626 km (0.045 R)
- M69: 14,403,283 km (0.072 R)
- M70: 15,198,246 km (0.116 R)
- M71: 15,271,250 km (0.098 R)
- M72: 15,515,394 km (0.117 R)
- M73: 15,711,666 km (0.083 R)
- M74: 16,007,571 km (0.073 R)
- M75: 16,404,903 km (0.109 R)
- M76: 16,529,817 km (0.059 R)
- M77: 16,780,393 km (0.095 R)
Planet 3 - Gas Giant
Semi-Major Axis: 6.78 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 880.6
Radius: 10.3
Gravity: 8.3 G
Time & Orbit
Eccentricity (e): 0.047
Orbit Range: 6.46 AU - 7.1 AU
Year: 6293 Days
Day: 7.3 Hours
Environment
Temp: -146 °C
Axial Tilt: 2.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (82)
Outer Limit: 57,496,387 km
- M1: 367,263 km (0.092 R)
- M2: 633,547 km (0.115 R)
- M3: 731,234 km (0.045 R)
- M4: 864,975 km (0.097 R)
- M5: 1,298,360 km (0.1 R)
- M6: 1,793,678 km (0.053 R)
- M7: 1,999,226 km (0.09 R)
- M8: 2,169,169 km (0.119 R)
- M9: 2,256,085 km (0.103 R)
- M10: 2,433,359 km (0.102 R)
- M11: 2,661,496 km (0.118 R)
- M12: 2,731,358 km (0.068 R)
- M13: 3,065,410 km (0.063 R)
- M14: 4,037,347 km (0.098 R)
- M15: 4,171,985 km (0.118 R)
- M16: 4,363,022 km (0.113 R)
- M17: 5,243,555 km (0.04 R)
- M18: 5,479,620 km (0.096 R)
- M19: 5,599,000 km (0.082 R)
- M20: 5,809,933 km (0.034 R)
- M21: 6,146,827 km (0.042 R)
- M22: 6,239,877 km (0.078 R)
- M23: 6,364,641 km (0.062 R)
- M24: 6,553,284 km (0.03 R)
- M25: 7,195,508 km (0.065 R)
- M26: 7,491,113 km (0.079 R)
- M27: 7,590,446 km (0.06 R)
- M28: 7,757,248 km (0.072 R)
- M29: 7,925,097 km (0.087 R)
- M30: 8,574,202 km (0.094 R)
- M31: 9,923,126 km (0.098 R)
- M32: 9,995,980 km (0.077 R)
- M33: 10,142,137 km (0.085 R)
- M34: 10,473,646 km (0.028 R)
- M35: 10,996,491 km (0.058 R)
- M36: 11,261,129 km (0.088 R)
- M37: 12,184,298 km (0.104 R)
- M38: 12,340,478 km (0.103 R)
- M39: 12,418,867 km (0.118 R)
- M40: 12,497,406 km (0.118 R)
- M41: 12,852,851 km (0.107 R)
- M42: 13,614,304 km (0.108 R)
- M43: 14,143,581 km (0.083 R)
- M44: 14,971,157 km (0.055 R)
- M45: 15,348,742 km (0.054 R)
- M46: 15,729,468 km (0.104 R)
- M47: 16,027,617 km (0.11 R)
- M48: 16,456,963 km (0.099 R)
- M49: 17,635,046 km (0.103 R)
- M50: 17,856,151 km (0.099 R)
- M51: 18,345,935 km (0.09 R)
- M52: 19,156,755 km (0.042 R)
- M53: 19,979,394 km (0.087 R)
- M54: 20,534,253 km (0.075 R)
- M55: 20,767,027 km (0.07 R)
- M56: 21,801,197 km (0.088 R)
- M57: 23,093,124 km (0.095 R)
- M58: 23,432,262 km (0.071 R)
- M59: 23,675,359 km (0.066 R)
- M60: 24,804,673 km (0.117 R)
- M61: 25,251,373 km (0.097 R)
- M62: 25,450,787 km (0.095 R)
- M63: 25,650,799 km (0.111 R)
- M64: 25,951,640 km (0.033 R)
- M65: 27,166,674 km (0.093 R)
- M66: 27,268,849 km (0.11 R)
- M67: 27,524,662 km (0.062 R)
- M68: 27,781,222 km (0.116 R)
- M69: 28,090,142 km (0.098 R)
- M70: 28,555,840 km (0.07 R)
- M71: 28,867,602 km (0.105 R)
- M72: 31,188,613 km (0.099 R)
- M73: 31,348,982 km (0.097 R)
- M74: 33,459,509 km (0.117 R)
- M75: 33,788,175 km (0.089 R)
- M76: 34,062,986 km (0.088 R)
- M77: 35,058,261 km (0.07 R)
- M78: 35,392,163 km (0.097 R)
- M79: 36,063,110 km (0.081 R)
- M80: 36,512,801 km (0.109 R)
- M81: 36,681,996 km (0.083 R)
- M82: 38,101,231 km (0.088 R)
Planet 4 - Gas Giant
Semi-Major Axis: 10.39 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 586.3
Radius: 11
Gravity: 4.85 G
Time & Orbit
Eccentricity (e): 0.242
Orbit Range: 7.88 AU - 12.9 AU
Year: 11938 Days
Day: 11.7 Hours
Environment
Temp: -173 °C
Axial Tilt: 18.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (87)
Outer Limit: 57,496,387 km
- M1: 160,519 km (0.077 R)
- M2: 270,623 km (0.063 R)
- M3: 363,373 km (0.101 R)
- M4: 576,401 km (0.119 R)
- M5: 673,938 km (0.11 R)
- M6: 925,263 km (0.12 R)
- M7: 1,825,244 km (0.075 R)
- M8: 2,000,273 km (0.071 R)
- M9: 2,077,017 km (0.094 R)
- M10: 3,133,776 km (0.093 R)
- M11: 3,685,344 km (0.093 R)
- M12: 3,940,408 km (0.083 R)
- M13: 4,433,931 km (0.115 R)
- M14: 4,602,827 km (0.078 R)
- M15: 4,843,081 km (0.117 R)
- M16: 4,912,345 km (0.086 R)
- M17: 5,734,086 km (0.089 R)
- M18: 6,104,790 km (0.108 R)
- M19: 6,908,280 km (0.068 R)
- M20: 7,144,046 km (0.085 R)
- M21: 7,990,022 km (0.071 R)
- M22: 8,113,590 km (0.1 R)
- M23: 9,513,078 km (0.096 R)
- M24: 9,687,809 km (0.104 R)
- M25: 9,775,622 km (0.083 R)
- M26: 10,487,110 km (0.113 R)
- M27: 12,338,384 km (0.109 R)
- M28: 13,204,106 km (0.107 R)
- M29: 13,301,495 km (0.08 R)
- M30: 13,399,182 km (0.118 R)
- M31: 13,644,223 km (0.109 R)
- M32: 14,438,738 km (0.117 R)
- M33: 14,791,041 km (0.111 R)
- M34: 15,401,550 km (0.102 R)
- M35: 15,504,024 km (0.078 R)
- M36: 15,658,409 km (0.044 R)
- M37: 15,916,615 km (0.059 R)
- M38: 16,542,233 km (0.117 R)
- M39: 16,963,800 km (0.074 R)
- M40: 17,602,733 km (0.066 R)
- M41: 18,630,470 km (0.064 R)
- M42: 18,904,234 km (0.113 R)
- M43: 19,179,195 km (0.094 R)
- M44: 19,289,598 km (0.072 R)
- M45: 19,677,655 km (0.096 R)
- M46: 19,956,356 km (0.112 R)
- M47: 20,068,255 km (0.074 R)
- M48: 20,630,743 km (0.055 R)
- M49: 22,815,171 km (0.107 R)
- M50: 23,402,193 km (0.074 R)
- M51: 24,172,772 km (0.117 R)
- M52: 24,351,691 km (0.104 R)
- M53: 24,471,220 km (0.1 R)
- M54: 25,434,929 km (0.109 R)
- M55: 25,616,990 km (0.113 R)
- M56: 26,043,493 km (0.114 R)
- M57: 27,151,116 km (0.046 R)
- M58: 28,148,485 km (0.103 R)
- M59: 28,273,998 km (0.039 R)
- M60: 29,348,409 km (0.085 R)
- M61: 30,823,295 km (0.1 R)
- M62: 31,732,850 km (0.092 R)
- M63: 32,453,612 km (0.103 R)
- M64: 33,312,454 km (0.105 R)
- M65: 34,312,665 km (0.067 R)
- M66: 34,782,851 km (0.082 R)
- M67: 35,119,895 km (0.12 R)
- M68: 36,001,625 km (0.043 R)
- M69: 36,206,125 km (0.084 R)
- M70: 36,753,205 km (0.055 R)
- M71: 37,027,867 km (0.102 R)
- M72: 39,600,352 km (0.118 R)
- M73: 40,093,426 km (0.117 R)
- M74: 40,872,532 km (0.088 R)
- M75: 41,228,276 km (0.052 R)
- M76: 41,299,484 km (0.076 R)
- M77: 41,370,842 km (0.087 R)
- M78: 42,805,785 km (0.087 R)
- M79: 44,257,034 km (0.066 R)
- M80: 45,798,191 km (0.111 R)
- M81: 46,909,853 km (0.066 R)
- M82: 47,282,352 km (0.064 R)
- M83: 48,255,336 km (0.092 R)
- M84: 48,330,434 km (0.054 R)
- M85: 48,405,682 km (0.073 R)
- M86: 50,831,412 km (0.097 R)
- M87: 51,137,489 km (0.074 R)
Planet 5 - Gas Giant
Semi-Major Axis: 10.78 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 877.1
Radius: 8.8
Gravity: 11.33 G
Time & Orbit
Eccentricity (e): 0.09
Orbit Range: 9.81 AU - 11.75 AU
Year: 12616 Days
Day: 9.8 Hours
Environment
Temp: -177 °C
Axial Tilt: 44.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (91)
Outer Limit: 57,496,387 km
- M1: 119,379 km (0.107 R)
- M2: 378,632 km (0.12 R)
- M3: 489,783 km (0.119 R)
- M4: 613,052 km (0.044 R)
- M5: 688,449 km (0.101 R)
- M6: 1,330,523 km (0.118 R)
- M7: 1,405,622 km (0.098 R)
- M8: 1,857,706 km (0.042 R)
- M9: 2,413,762 km (0.034 R)
- M10: 3,018,735 km (0.049 R)
- M11: 3,253,155 km (0.113 R)
- M12: 3,739,797 km (0.076 R)
- M13: 3,847,208 km (0.102 R)
- M14: 4,323,977 km (0.087 R)
- M15: 5,292,922 km (0.069 R)
- M16: 5,373,256 km (0.096 R)
- M17: 5,657,791 km (0.117 R)
- M18: 5,905,526 km (0.09 R)
- M19: 6,072,776 km (0.119 R)
- M20: 7,556,188 km (0.115 R)
- M21: 9,145,516 km (0.074 R)
- M22: 9,534,171 km (0.065 R)
- M23: 9,977,729 km (0.083 R)
- M24: 10,630,574 km (0.103 R)
- M25: 11,193,661 km (0.1 R)
- M26: 11,400,854 km (0.037 R)
- M27: 11,661,603 km (0.088 R)
- M28: 12,562,780 km (0.09 R)
- M29: 13,103,427 km (0.087 R)
- M30: 13,984,259 km (0.095 R)
- M31: 14,263,409 km (0.045 R)
- M32: 14,488,105 km (0.115 R)
- M33: 15,169,074 km (0.112 R)
- M34: 15,283,666 km (0.092 R)
- M35: 15,513,449 km (0.09 R)
- M36: 15,628,938 km (0.114 R)
- M37: 16,503,338 km (0.088 R)
- M38: 18,299,560 km (0.087 R)
- M39: 19,655,814 km (0.077 R)
- M40: 19,968,473 km (0.084 R)
- M41: 20,156,967 km (0.116 R)
- M42: 21,556,754 km (0.087 R)
- M43: 23,582,010 km (0.102 R)
- M44: 23,914,416 km (0.107 R)
- M45: 24,114,429 km (0.101 R)
- M46: 24,718,206 km (0.082 R)
- M47: 24,785,674 km (0.112 R)
- M48: 25,803,838 km (0.094 R)
- M49: 25,872,204 km (0.095 R)
- M50: 26,628,122 km (0.093 R)
- M51: 26,697,236 km (0.102 R)
- M52: 26,904,878 km (0.082 R)
- M53: 27,252,095 km (0.082 R)
- M54: 29,295,302 km (0.029 R)
- M55: 32,488,020 km (0.079 R)
- M56: 32,561,921 km (0.1 R)
- M57: 33,750,925 km (0.053 R)
- M58: 34,576,556 km (0.108 R)
- M59: 35,257,077 km (0.064 R)
- M60: 35,865,790 km (0.042 R)
- M61: 35,942,085 km (0.041 R)
- M62: 37,093,390 km (0.101 R)
- M63: 37,170,583 km (0.103 R)
- M64: 37,867,559 km (0.035 R)
- M65: 38,412,694 km (0.104 R)
- M66: 38,725,354 km (0.107 R)
- M67: 39,038,911 km (0.097 R)
- M68: 39,195,989 km (0.063 R)
- M69: 39,747,406 km (0.109 R)
- M70: 40,142,943 km (0.1 R)
- M71: 40,222,080 km (0.07 R)
- M72: 40,698,699 km (0.075 R)
- M73: 42,381,526 km (0.095 R)
- M74: 43,597,307 km (0.113 R)
- M75: 43,923,431 km (0.111 R)
- M76: 44,005,111 km (0.102 R)
- M77: 45,649,042 km (0.119 R)
- M78: 46,895,193 km (0.06 R)
- M79: 47,313,019 km (0.096 R)
- M80: 47,480,569 km (0.067 R)
- M81: 47,984,115 km (0.096 R)
- M82: 48,236,637 km (0.092 R)
- M83: 50,700,065 km (0.027 R)
- M84: 54,339,631 km (0.104 R)
- M85: 54,954,329 km (0.029 R)
- M86: 55,483,157 km (0.071 R)
- M87: 56,102,193 km (0.11 R)
- M88: 57,615,077 km (0.076 R)
- M89: 58,690,985 km (0.07 R)
- M90: 59,954,638 km (0.032 R)
- M91: 60,045,294 km (0.081 R)
Asteroid Belt
Center: 11.49 AU
Composition
Type: Outer System (Icy)
A dense region of planetesimals and debris.
Boundary
Planet 6 - Gas Giant
Semi-Major Axis: 12.19 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 513.7
Radius: 11.2
Gravity: 4.1 G
Time & Orbit
Eccentricity (e): 0.033
Orbit Range: 11.79 AU - 12.59 AU
Year: 15171 Days
Day: 14.9 Hours
Environment
Temp: -171 °C
Axial Tilt: 18.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (84)
Outer Limit: 57,496,387 km
- M1: 214,673 km (0.117 R)
- M2: 352,602 km (0.104 R)
- M3: 498,909 km (0.076 R)
- M4: 1,067,979 km (0.054 R)
- M5: 1,224,459 km (0.049 R)
- M6: 1,461,571 km (0.11 R)
- M7: 1,611,169 km (0.1 R)
- M8: 2,260,424 km (0.107 R)
- M9: 2,921,347 km (0.107 R)
- M10: 3,404,997 km (0.108 R)
- M11: 3,879,222 km (0.04 R)
- M12: 4,053,654 km (0.11 R)
- M13: 4,302,285 km (0.07 R)
- M14: 4,482,999 km (0.068 R)
- M15: 5,192,692 km (0.039 R)
- M16: 5,308,032 km (0.113 R)
- M17: 5,385,374 km (0.107 R)
- M18: 5,502,060 km (0.061 R)
- M19: 6,631,823 km (0.101 R)
- M20: 6,757,037 km (0.113 R)
- M21: 6,840,961 km (0.087 R)
- M22: 7,743,335 km (0.079 R)
- M23: 7,919,562 km (0.111 R)
- M24: 8,052,554 km (0.109 R)
- M25: 8,186,295 km (0.105 R)
- M26: 8,320,783 km (0.038 R)
- M27: 9,800,605 km (0.1 R)
- M28: 9,943,471 km (0.029 R)
- M29: 10,473,347 km (0.119 R)
- M30: 11,560,624 km (0.062 R)
- M31: 11,812,846 km (0.106 R)
- M32: 11,914,124 km (0.093 R)
- M33: 12,683,655 km (0.112 R)
- M34: 12,995,866 km (0.101 R)
- M35: 13,258,111 km (0.106 R)
- M36: 15,032,192 km (0.046 R)
- M37: 17,569,223 km (0.071 R)
- M38: 18,738,779 km (0.082 R)
- M39: 19,332,982 km (0.044 R)
- M40: 19,452,510 km (0.041 R)
- M41: 20,845,416 km (0.073 R)
- M42: 21,029,421 km (0.115 R)
- M43: 21,275,660 km (0.117 R)
- M44: 21,708,895 km (0.03 R)
- M45: 22,395,699 km (0.11 R)
- M46: 22,773,284 km (0.115 R)
- M47: 23,598,615 km (0.089 R)
- M48: 23,726,372 km (0.03 R)
- M49: 24,433,671 km (0.071 R)
- M50: 25,409,348 km (0.06 R)
- M51: 26,663,277 km (0.064 R)
- M52: 27,869,784 km (0.12 R)
- M53: 28,005,021 km (0.111 R)
- M54: 28,957,211 km (0.103 R)
- M55: 30,823,594 km (0.117 R)
- M56: 31,313,677 km (0.11 R)
- M57: 32,230,861 km (0.086 R)
- M58: 32,301,771 km (0.058 R)
- M59: 33,085,364 km (0.043 R)
- M60: 33,443,651 km (0.086 R)
- M61: 34,671,251 km (0.048 R)
- M62: 35,327,088 km (0.103 R)
- M63: 35,987,114 km (0.113 R)
- M64: 38,141,324 km (0.103 R)
- M65: 38,441,866 km (0.061 R)
- M66: 39,347,681 km (0.09 R)
- M67: 41,411,832 km (0.078 R)
- M68: 41,643,260 km (0.077 R)
- M69: 42,185,104 km (0.116 R)
- M70: 42,651,400 km (0.108 R)
- M71: 43,119,492 km (0.097 R)
- M72: 44,612,778 km (0.088 R)
- M73: 44,850,040 km (0.059 R)
- M74: 45,008,464 km (0.112 R)
- M75: 45,326,060 km (0.096 R)
- M76: 45,803,577 km (0.087 R)
- M77: 47,085,331 km (0.064 R)
- M78: 47,569,131 km (0.039 R)
- M79: 48,948,423 km (0.048 R)
- M80: 51,249,089 km (0.099 R)
- M81: 51,912,855 km (0.078 R)
- M82: 52,412,512 km (0.029 R)
- M83: 55,189,198 km (0.12 R)
- M84: 56,467,063 km (0.077 R)
Kuiper Belt
Range: 30.8 - 48.8 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 185 - 20,113 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.