G9V Star System Generated (Seed: 1766627930)
Star Details
Spectral Class: G0V
Temperature: 5,920 K
Mass: 1.08 sol
Luminosity: 1.31 lux
Habitable Zone (HZ)
Inner Boundary: 1.09 AU
Outer Boundary: 1.57 AU
Physical Limits
Snow Line: 5.49 AU
Max System Radius: 20.8 AU
Planetary System (7 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 0.83 AU
Status: Inner (Hot)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 1.08
Radius: 1.03
Gravity: 1.02 G
Time & Orbit
Eccentricity (e): 0.202
Orbit Range: 0.66 AU - 1 AU
Year: 266 Days
Day: 15 Hours
Environment
Temp: 122 °C
Axial Tilt: 11.6 °
Atmosphere: Dense COâ‚‚
Biome: Volcanic/Barren
Satellites (1)
Outer Limit: 82,039,324 km
- M1: 224,247 km (0.111 R)
Planet 2 - Terrestrial
Semi-Major Axis: 3.72 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 0.1
Radius: 0.4
Gravity: 0.63 G
Time & Orbit
Eccentricity (e): 0.024
Orbit Range: 3.63 AU - 3.81 AU
Year: 2522 Days
Day: 47.6 Hours
Environment
Temp: -104 °C
Axial Tilt: 37.4 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Planet 3 - Gas Giant
Semi-Major Axis: 9.65 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 240.4
Radius: 8.5
Gravity: 3.33 G
Time & Orbit
Eccentricity (e): 0.225
Orbit Range: 7.48 AU - 11.82 AU
Year: 10536 Days
Day: 11.7 Hours
Environment
Temp: -158 °C
Axial Tilt: 11.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (63)
Outer Limit: 82,039,324 km
- M1: 278,102 km (0.11 R)
- M2: 374,443 km (0.116 R)
- M3: 449,990 km (0.044 R)
- M4: 543,639 km (0.08 R)
- M5: 808,277 km (0.12 R)
- M6: 1,344,436 km (0.119 R)
- M7: 1,704,069 km (0.069 R)
- M8: 2,402,542 km (0.078 R)
- M9: 2,617,065 km (0.094 R)
- M10: 3,042,073 km (0.059 R)
- M11: 3,204,087 km (0.086 R)
- M12: 3,731,719 km (0.062 R)
- M13: 3,830,603 km (0.083 R)
- M14: 4,468,488 km (0.054 R)
- M15: 4,732,828 km (0.066 R)
- M16: 5,138,986 km (0.117 R)
- M17: 5,332,267 km (0.111 R)
- M18: 6,158,944 km (0.114 R)
- M19: 7,239,789 km (0.099 R)
- M20: 8,410,841 km (0.105 R)
- M21: 9,101,235 km (0.109 R)
- M22: 9,234,976 km (0.117 R)
- M23: 9,912,654 km (0.112 R)
- M24: 10,050,135 km (0.067 R)
- M25: 10,361,747 km (0.06 R)
- M26: 10,536,328 km (0.098 R)
- M27: 10,923,637 km (0.112 R)
- M28: 11,136,963 km (0.11 R)
- M29: 12,630,847 km (0.062 R)
- M30: 13,230,884 km (0.112 R)
- M31: 13,306,431 km (0.067 R)
- M32: 13,382,278 km (0.073 R)
- M33: 13,955,387 km (0.117 R)
- M34: 14,303,052 km (0.06 R)
- M35: 14,380,694 km (0.033 R)
- M36: 16,856,688 km (0.107 R)
- M37: 17,808,131 km (0.093 R)
- M38: 18,480,423 km (0.105 R)
- M39: 19,676,608 km (0.11 R)
- M40: 20,109,843 km (0.107 R)
- M41: 20,327,807 km (0.093 R)
- M42: 21,919,080 km (0.027 R)
- M43: 22,053,569 km (0.093 R)
- M44: 22,413,351 km (0.083 R)
- M45: 22,639,244 km (0.088 R)
- M46: 22,956,691 km (0.113 R)
- M47: 24,102,461 km (0.107 R)
- M48: 24,892,338 km (0.063 R)
- M49: 25,079,335 km (0.117 R)
- M50: 25,784,988 km (0.09 R)
- M51: 26,069,224 km (0.11 R)
- M52: 26,354,358 km (0.072 R)
- M53: 26,449,502 km (0.061 R)
- M54: 26,784,003 km (0.114 R)
- M55: 27,601,854 km (0.076 R)
- M56: 27,795,434 km (0.074 R)
- M57: 27,989,462 km (0.086 R)
- M58: 28,232,709 km (0.091 R)
- M59: 29,905,362 km (0.071 R)
- M60: 30,104,328 km (0.103 R)
- M61: 30,853,962 km (0.11 R)
- M62: 34,069,419 km (0.096 R)
- M63: 34,641,631 km (0.046 R)
Planet 4 - Gas Giant
Semi-Major Axis: 10.55 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 212.9
Radius: 8.5
Gravity: 2.95 G
Time & Orbit
Eccentricity (e): 0.015
Orbit Range: 10.39 AU - 10.71 AU
Year: 12044 Days
Day: 9.9 Hours
Environment
Temp: -167 °C
Axial Tilt: 38.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (76)
Outer Limit: 82,039,324 km
- M1: 122,670 km (0.119 R)
- M2: 398,828 km (0.115 R)
- M3: 527,781 km (0.103 R)
- M4: 657,782 km (0.102 R)
- M5: 769,980 km (0.073 R)
- M6: 919,429 km (0.064 R)
- M7: 981,960 km (0.102 R)
- M8: 1,497,774 km (0.06 R)
- M9: 2,363,796 km (0.094 R)
- M10: 2,927,780 km (0.044 R)
- M11: 2,998,241 km (0.104 R)
- M12: 3,964,942 km (0.086 R)
- M13: 4,253,965 km (0.069 R)
- M14: 5,105,177 km (0.076 R)
- M15: 5,304,441 km (0.091 R)
- M16: 5,419,632 km (0.116 R)
- M17: 5,769,840 km (0.096 R)
- M18: 6,339,509 km (0.1 R)
- M19: 6,431,212 km (0.104 R)
- M20: 6,584,849 km (0.103 R)
- M21: 6,801,916 km (0.113 R)
- M22: 7,021,526 km (0.077 R)
- M23: 7,339,272 km (0.085 R)
- M24: 7,499,790 km (0.084 R)
- M25: 7,922,853 km (0.06 R)
- M26: 8,187,192 km (0.106 R)
- M27: 9,481,513 km (0.094 R)
- M28: 9,621,387 km (0.062 R)
- M29: 10,152,310 km (0.117 R)
- M30: 10,295,475 km (0.115 R)
- M31: 10,511,494 km (0.106 R)
- M32: 11,279,380 km (0.118 R)
- M33: 11,353,431 km (0.077 R)
- M34: 11,576,631 km (0.114 R)
- M35: 11,651,430 km (0.107 R)
- M36: 11,838,876 km (0.095 R)
- M37: 13,374,947 km (0.118 R)
- M38: 13,571,220 km (0.106 R)
- M39: 13,729,045 km (0.114 R)
- M40: 14,086,435 km (0.097 R)
- M41: 14,688,566 km (0.068 R)
- M42: 16,043,025 km (0.057 R)
- M43: 16,293,602 km (0.118 R)
- M44: 17,565,632 km (0.12 R)
- M45: 17,910,306 km (0.114 R)
- M46: 18,300,607 km (0.067 R)
- M47: 18,387,822 km (0.115 R)
- M48: 18,518,720 km (0.09 R)
- M49: 18,649,918 km (0.09 R)
- M50: 18,869,378 km (0.111 R)
- M51: 20,114,182 km (0.049 R)
- M52: 20,701,054 km (0.085 R)
- M53: 22,402,132 km (0.085 R)
- M54: 22,588,680 km (0.064 R)
- M55: 23,057,520 km (0.119 R)
- M56: 24,052,196 km (0.081 R)
- M57: 24,291,104 km (0.115 R)
- M58: 25,254,514 km (0.079 R)
- M59: 25,985,449 km (0.072 R)
- M60: 26,970,551 km (0.118 R)
- M61: 27,119,401 km (0.051 R)
- M62: 28,018,185 km (0.112 R)
- M63: 28,471,168 km (0.095 R)
- M64: 29,742,301 km (0.117 R)
- M65: 30,152,947 km (0.047 R)
- M66: 30,256,020 km (0.096 R)
- M67: 30,720,671 km (0.043 R)
- M68: 31,239,925 km (0.111 R)
- M69: 31,396,255 km (0.038 R)
- M70: 31,552,734 km (0.066 R)
- M71: 34,146,911 km (0.074 R)
- M72: 34,954,590 km (0.063 R)
- M73: 35,496,583 km (0.074 R)
- M74: 35,605,340 km (0.086 R)
- M75: 36,314,734 km (0.114 R)
- M76: 36,643,699 km (0.042 R)
Planet 5 - Gas Giant
Semi-Major Axis: 10.79 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 674.9
Radius: 9
Gravity: 8.33 G
Time & Orbit
Eccentricity (e): 0.101
Orbit Range: 9.7 AU - 11.88 AU
Year: 12457 Days
Day: 9.4 Hours
Environment
Temp: -178 °C
Axial Tilt: 23 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (87)
Outer Limit: 82,039,324 km
- M1: 151,393 km (0.097 R)
- M2: 384,018 km (0.11 R)
- M3: 765,343 km (0.092 R)
- M4: 842,236 km (0.029 R)
- M5: 901,626 km (0.072 R)
- M6: 983,307 km (0.042 R)
- M7: 1,089,072 km (0.104 R)
- M8: 1,266,496 km (0.085 R)
- M9: 1,358,797 km (0.092 R)
- M10: 1,725,462 km (0.1 R)
- M11: 1,880,744 km (0.069 R)
- M12: 2,095,118 km (0.087 R)
- M13: 2,754,695 km (0.086 R)
- M14: 3,572,846 km (0.104 R)
- M15: 4,748,087 km (0.06 R)
- M16: 5,415,144 km (0.092 R)
- M17: 5,529,137 km (0.117 R)
- M18: 5,605,582 km (0.037 R)
- M19: 6,032,534 km (0.071 R)
- M20: 6,190,509 km (0.1 R)
- M21: 6,672,364 km (0.115 R)
- M22: 7,000,283 km (0.111 R)
- M23: 7,249,812 km (0.113 R)
- M24: 7,459,997 km (0.118 R)
- M25: 8,189,436 km (0.116 R)
- M26: 8,320,484 km (0.085 R)
- M27: 8,986,494 km (0.102 R)
- M28: 9,257,715 km (0.082 R)
- M29: 9,947,510 km (0.053 R)
- M30: 10,322,103 km (0.099 R)
- M31: 10,463,773 km (0.101 R)
- M32: 11,085,352 km (0.081 R)
- M33: 12,214,068 km (0.11 R)
- M34: 12,766,682 km (0.084 R)
- M35: 13,122,725 km (0.118 R)
- M36: 13,948,655 km (0.082 R)
- M37: 14,262,661 km (0.107 R)
- M38: 14,791,340 km (0.119 R)
- M39: 15,542,172 km (0.07 R)
- M40: 15,759,088 km (0.109 R)
- M41: 16,913,685 km (0.095 R)
- M42: 17,360,833 km (0.06 R)
- M43: 18,209,502 km (0.102 R)
- M44: 18,438,087 km (0.106 R)
- M45: 19,888,289 km (0.089 R)
- M46: 20,005,873 km (0.03 R)
- M47: 20,954,922 km (0.117 R)
- M48: 21,194,578 km (0.043 R)
- M49: 21,615,995 km (0.117 R)
- M50: 21,736,870 km (0.032 R)
- M51: 22,222,913 km (0.056 R)
- M52: 22,896,852 km (0.106 R)
- M53: 24,076,880 km (0.105 R)
- M54: 24,265,074 km (0.106 R)
- M55: 25,467,841 km (0.064 R)
- M56: 26,819,607 km (0.087 R)
- M57: 28,062,765 km (0.094 R)
- M58: 28,724,586 km (0.066 R)
- M59: 28,791,008 km (0.097 R)
- M60: 29,391,494 km (0.083 R)
- M61: 30,198,574 km (0.106 R)
- M62: 32,041,022 km (0.091 R)
- M63: 32,247,915 km (0.111 R)
- M64: 32,663,199 km (0.052 R)
- M65: 33,289,416 km (0.089 R)
- M66: 33,429,140 km (0.06 R)
- M67: 34,483,057 km (0.109 R)
- M68: 35,405,178 km (0.063 R)
- M69: 36,335,528 km (0.081 R)
- M70: 37,418,915 km (0.098 R)
- M71: 37,782,438 km (0.115 R)
- M72: 38,074,004 km (0.073 R)
- M73: 38,366,468 km (0.056 R)
- M74: 38,512,925 km (0.089 R)
- M75: 39,469,603 km (0.088 R)
- M76: 39,913,759 km (0.109 R)
- M77: 40,583,060 km (0.069 R)
- M78: 40,732,359 km (0.108 R)
- M79: 43,145,073 km (0.111 R)
- M80: 43,831,877 km (0.084 R)
- M81: 43,985,065 km (0.119 R)
- M82: 45,062,020 km (0.105 R)
- M83: 49,216,951 km (0.105 R)
- M84: 51,218,870 km (0.082 R)
- M85: 52,026,998 km (0.102 R)
- M86: 54,066,017 km (0.085 R)
- M87: 54,312,405 km (0.044 R)
Planet 6 - Ice Giant
Semi-Major Axis: 16.45 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 968.3
Radius: 3.3
Gravity: 88.92 G
Time & Orbit
Eccentricity (e): 0.229
Orbit Range: 12.68 AU - 20.22 AU
Year: 23449 Days
Day: 23.9 Hours
Environment
Temp: -186 °C
Axial Tilt: 17.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (92)
Outer Limit: 82,039,324 km
- M1: 215,421 km (0.087 R)
- M2: 251,474 km (0.061 R)
- M3: 828,922 km (0.028 R)
- M4: 1,166,415 km (0.028 R)
- M5: 1,332,618 km (0.119 R)
- M6: 1,366,726 km (0.105 R)
- M7: 1,401,134 km (0.056 R)
- M8: 1,435,840 km (0.039 R)
- M9: 1,506,151 km (0.09 R)
- M10: 1,687,015 km (0.071 R)
- M11: 2,188,617 km (0.082 R)
- M12: 2,518,630 km (0.111 R)
- M13: 2,776,237 km (0.105 R)
- M14: 3,598,427 km (0.067 R)
- M15: 3,646,149 km (0.094 R)
- M16: 4,489,582 km (0.081 R)
- M17: 5,335,707 km (0.111 R)
- M18: 5,444,764 km (0.104 R)
- M19: 5,499,667 km (0.104 R)
- M20: 6,634,815 km (0.09 R)
- M21: 6,693,458 km (0.116 R)
- M22: 6,752,249 km (0.083 R)
- M23: 8,088,158 km (0.105 R)
- M24: 8,657,528 km (0.103 R)
- M25: 8,721,556 km (0.119 R)
- M26: 9,968,454 km (0.079 R)
- M27: 10,373,565 km (0.09 R)
- M28: 10,922,141 km (0.106 R)
- M29: 14,939,591 km (0.081 R)
- M30: 15,402,746 km (0.105 R)
- M31: 15,636,119 km (0.084 R)
- M32: 15,792,299 km (0.097 R)
- M33: 15,948,928 km (0.046 R)
- M34: 16,106,156 km (0.091 R)
- M35: 16,900,071 km (0.113 R)
- M36: 17,140,774 km (0.084 R)
- M37: 17,221,258 km (0.068 R)
- M38: 17,382,525 km (0.088 R)
- M39: 17,544,389 km (0.087 R)
- M40: 17,625,472 km (0.108 R)
- M41: 18,032,827 km (0.05 R)
- M42: 18,114,657 km (0.074 R)
- M43: 24,141,207 km (0.096 R)
- M44: 24,866,008 km (0.11 R)
- M45: 26,429,755 km (0.109 R)
- M46: 26,615,855 km (0.059 R)
- M47: 27,082,899 km (0.109 R)
- M48: 30,427,010 km (0.095 R)
- M49: 34,913,301 km (0.047 R)
- M50: 35,321,852 km (0.109 R)
- M51: 36,144,042 km (0.08 R)
- M52: 38,858,795 km (0.104 R)
- M53: 40,133,818 km (0.073 R)
- M54: 42,724,553 km (0.115 R)
- M55: 46,710,888 km (0.103 R)
- M56: 46,935,734 km (0.087 R)
- M57: 47,161,028 km (0.091 R)
- M58: 48,179,191 km (0.103 R)
- M59: 49,892,236 km (0.089 R)
- M60: 50,467,590 km (0.043 R)
- M61: 50,698,419 km (0.051 R)
- M62: 51,741,266 km (0.076 R)
- M63: 52,557,322 km (0.112 R)
- M64: 53,965,936 km (0.099 R)
- M65: 55,149,405 km (0.091 R)
- M66: 57,421,347 km (0.08 R)
- M67: 57,541,774 km (0.09 R)
- M68: 58,265,977 km (0.086 R)
- M69: 58,629,350 km (0.106 R)
- M70: 60,702,029 km (0.054 R)
- M71: 61,685,635 km (0.09 R)
- M72: 62,426,892 km (0.118 R)
- M73: 64,793,531 km (0.047 R)
- M74: 67,189,191 km (0.118 R)
- M75: 67,316,199 km (0.116 R)
- M76: 68,079,149 km (0.116 R)
- M77: 73,499,977 km (0.108 R)
- M78: 75,865,269 km (0.115 R)
- M79: 76,394,397 km (0.072 R)
- M80: 78,122,102 km (0.117 R)
- M81: 79,191,578 km (0.105 R)
- M82: 79,325,617 km (0.093 R)
- M83: 80,940,078 km (0.104 R)
- M84: 81,480,575 km (0.12 R)
- M85: 82,701,144 km (0.118 R)
- M86: 83,654,681 km (0.112 R)
- M87: 87,089,597 km (0.038 R)
- M88: 87,920,763 km (0.086 R)
- M89: 88,893,897 km (0.057 R)
- M90: 90,430,267 km (0.045 R)
- M91: 91,271,905 km (0.102 R)
- M92: 91,553,149 km (0.079 R)
Planet 7 - Ice Giant
Semi-Major Axis: 16.45 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 624.6
Radius: 6.9
Gravity: 13.12 G
Time & Orbit
Eccentricity (e): 0.023
Orbit Range: 16.07 AU - 16.83 AU
Year: 23449 Days
Day: 20 Hours
Environment
Temp: -200 °C
Axial Tilt: 10.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (95)
Outer Limit: 82,039,324 km
- M1: 167,699 km (0.1 R)
- M2: 371,601 km (0.044 R)
- M3: 555,008 km (0.106 R)
- M4: 622,477 km (0.029 R)
- M5: 894,296 km (0.11 R)
- M6: 1,381,686 km (0.103 R)
- M7: 1,802,954 km (0.107 R)
- M8: 2,372,772 km (0.107 R)
- M9: 2,447,720 km (0.068 R)
- M10: 2,523,417 km (0.089 R)
- M11: 3,075,732 km (0.09 R)
- M12: 3,240,290 km (0.059 R)
- M13: 3,492,512 km (0.03 R)
- M14: 3,707,634 km (0.11 R)
- M15: 4,894,543 km (0.058 R)
- M16: 6,396,655 km (0.078 R)
- M17: 6,554,182 km (0.104 R)
- M18: 7,526,119 km (0.041 R)
- M19: 7,748,272 km (0.119 R)
- M20: 9,008,036 km (0.115 R)
- M21: 10,024,254 km (0.119 R)
- M22: 10,576,869 km (0.107 R)
- M23: 10,763,268 km (0.081 R)
- M24: 10,888,182 km (0.091 R)
- M25: 11,076,376 km (0.098 R)
- M26: 13,619,540 km (0.094 R)
- M27: 13,754,627 km (0.114 R)
- M28: 14,094,363 km (0.081 R)
- M29: 14,368,127 km (0.082 R)
- M30: 16,548,816 km (0.051 R)
- M31: 17,055,354 km (0.071 R)
- M32: 17,787,785 km (0.089 R)
- M33: 18,232,091 km (0.031 R)
- M34: 20,199,752 km (0.114 R)
- M35: 20,431,030 km (0.07 R)
- M36: 20,585,714 km (0.108 R)
- M37: 21,443,658 km (0.064 R)
- M38: 21,758,561 km (0.082 R)
- M39: 23,679,548 km (0.091 R)
- M40: 23,842,161 km (0.113 R)
- M41: 24,578,033 km (0.051 R)
- M42: 25,072,902 km (0.094 R)
- M43: 25,487,737 km (0.08 R)
- M44: 25,570,914 km (0.091 R)
- M45: 25,821,191 km (0.12 R)
- M46: 26,156,141 km (0.098 R)
- M47: 26,240,065 km (0.094 R)
- M48: 27,254,638 km (0.094 R)
- M49: 27,852,431 km (0.096 R)
- M50: 28,109,889 km (0.104 R)
- M51: 28,195,907 km (0.115 R)
- M52: 28,887,050 km (0.087 R)
- M53: 29,758,906 km (0.031 R)
- M54: 31,171,858 km (0.04 R)
- M55: 31,617,809 km (0.061 R)
- M56: 33,970,834 km (0.112 R)
- M57: 34,613,806 km (0.062 R)
- M58: 34,706,108 km (0.036 R)
- M59: 37,699,262 km (0.111 R)
- M60: 39,130,465 km (0.105 R)
- M61: 39,708,062 km (0.064 R)
- M62: 40,191,413 km (0.046 R)
- M63: 41,066,411 km (0.101 R)
- M64: 41,947,692 km (0.068 R)
- M65: 42,934,140 km (0.112 R)
- M66: 43,928,368 km (0.041 R)
- M67: 44,328,093 km (0.093 R)
- M68: 44,628,785 km (0.087 R)
- M69: 46,853,904 km (0.072 R)
- M70: 47,364,780 km (0.105 R)
- M71: 50,886,464 km (0.098 R)
- M72: 52,997,140 km (0.029 R)
- M73: 53,529,260 km (0.112 R)
- M74: 54,277,249 km (0.097 R)
- M75: 54,491,473 km (0.108 R)
- M76: 55,675,391 km (0.053 R)
- M77: 55,783,400 km (0.099 R)
- M78: 57,303,464 km (0.097 R)
- M79: 57,959,002 km (0.111 R)
- M80: 60,828,439 km (0.119 R)
- M81: 61,385,541 km (0.094 R)
- M82: 61,832,390 km (0.041 R)
- M83: 62,280,436 km (0.03 R)
- M84: 63,179,519 km (0.119 R)
- M85: 63,292,316 km (0.085 R)
- M86: 64,083,090 km (0.086 R)
- M87: 68,201,370 km (0.062 R)
- M88: 69,127,979 km (0.109 R)
- M89: 71,697,921 km (0.085 R)
- M90: 73,349,631 km (0.055 R)
- M91: 73,586,594 km (0.065 R)
- M92: 74,894,528 km (0.097 R)
- M93: 75,491,573 km (0.049 R)
- M94: 78,742,784 km (0.032 R)
- M95: 79,958,416 km (0.119 R)
Kuiper Belt
Range: 31.2 - 50.2 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 432 - 19,598 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.