G2V Star System Generated (Seed: 1766764747)
Star Details
Spectral Class: G6V
Temperature: 5,520 K
Mass: 0.98 sol
Luminosity: 0.93 lux
Habitable Zone (HZ)
Inner Boundary: 0.92 AU
Outer Boundary: 1.32 AU
Physical Limits
Snow Line: 4.63 AU
Max System Radius: 19.8 AU
Planetary System (9 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 0.54 AU
Status: Inner (Hot)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 1.96
Radius: 1.31
Gravity: 1.14 G
Time & Orbit
Eccentricity (e): 0.19
Orbit Range: 0.44 AU - 0.64 AU
Year: 146 Days
Day: 18.9 Hours
Environment
Temp: 202 °C
Axial Tilt: 8.3 °
Atmosphere: Dense COâ‚‚
Biome: Volcanic/Barren
Planet 2 - Terrestrial
Semi-Major Axis: 0.66 AU
Status: Inner (Hot)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 1
Radius: 1
Gravity: 1 G
Time & Orbit
Eccentricity (e): 0.031
Orbit Range: 0.64 AU - 0.68 AU
Year: 198 Days
Day: 29.1 Hours
Environment
Temp: 196 °C
Axial Tilt: 21.1 °
Atmosphere: Dense COâ‚‚
Biome: Volcanic/Barren
Satellites (1)
Outer Limit: 83,643,447 km
- M1: 45,029 km (0.114 R)
Planet 3 - Terrestrial
Semi-Major Axis: 0.79 AU
Status: Inner (Hot)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 2.5
Radius: 1.44
Gravity: 1.21 G
Time & Orbit
Eccentricity (e): 0.025
Orbit Range: 0.77 AU - 0.81 AU
Year: 259 Days
Day: 46.7 Hours
Environment
Temp: 84 °C
Axial Tilt: 28.9 °
Atmosphere: Dense COâ‚‚
Biome: Volcanic/Barren
Planet 4 - Terrestrial
Semi-Major Axis: 1.27 AU
Status: HZ
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 1.61
Radius: 1.21
Gravity: 1.1 G
Time & Orbit
Eccentricity (e): 0.193
Orbit Range: 1.02 AU - 1.52 AU
Year: 528 Days
Day: 13.9 Hours
Environment
Temp: 1 °C
Axial Tilt: 7.6 °
Atmosphere: Nâ‚‚, Oâ‚‚
Biome: Arid/Tundra
Satellites (1)
Outer Limit: 83,643,447 km
- M1: 724,802 km (0.065 R)
Planet 5 - Gas Giant
Semi-Major Axis: 5 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 422.5
Radius: 8.3
Gravity: 6.13 G
Time & Orbit
Eccentricity (e): 0.16
Orbit Range: 4.2 AU - 5.8 AU
Year: 4125 Days
Day: 5.6 Hours
Environment
Temp: -142 °C
Axial Tilt: 7.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (62)
Outer Limit: 83,643,447 km
- M1: 103,971 km (0.1 R)
- M2: 157,527 km (0.086 R)
- M3: 347,366 km (0.109 R)
- M4: 409,449 km (0.086 R)
- M5: 547,079 km (0.081 R)
- M6: 680,820 km (0.107 R)
- M7: 772,673 km (0.092 R)
- M8: 847,173 km (0.096 R)
- M9: 902,075 km (0.054 R)
- M10: 1,038,808 km (0.101 R)
- M11: 1,158,187 km (0.094 R)
- M12: 2,026,453 km (0.09 R)
- M13: 2,950,369 km (0.065 R)
- M14: 3,156,216 km (0.093 R)
- M15: 3,455,711 km (0.106 R)
- M16: 3,509,566 km (0.116 R)
- M17: 3,691,028 km (0.107 R)
- M18: 3,764,481 km (0.065 R)
- M19: 3,819,982 km (0.055 R)
- M20: 4,044,378 km (0.111 R)
- M21: 4,253,965 km (0.043 R)
- M22: 4,644,266 km (0.093 R)
- M23: 4,743,599 km (0.111 R)
- M24: 5,230,390 km (0.06 R)
- M25: 5,479,770 km (0.056 R)
- M26: 5,669,460 km (0.102 R)
- M27: 6,033,581 km (0.112 R)
- M28: 6,627,335 km (0.086 R)
- M29: 6,829,442 km (0.11 R)
- M30: 7,494,554 km (0.104 R)
- M31: 8,156,226 km (0.114 R)
- M32: 8,738,311 km (0.078 R)
- M33: 9,636,197 km (0.072 R)
- M34: 10,511,195 km (0.114 R)
- M35: 10,825,949 km (0.076 R)
- M36: 11,734,906 km (0.096 R)
- M37: 12,807,373 km (0.064 R)
- M38: 13,115,395 km (0.107 R)
- M39: 13,312,864 km (0.103 R)
- M40: 13,653,498 km (0.096 R)
- M41: 13,824,938 km (0.088 R)
- M42: 14,083,293 km (0.057 R)
- M43: 14,546,747 km (0.076 R)
- M44: 14,809,591 km (0.091 R)
- M45: 15,280,824 km (0.114 R)
- M46: 15,727,075 km (0.077 R)
- M47: 17,585,529 km (0.083 R)
- M48: 17,803,194 km (0.079 R)
- M49: 17,927,958 km (0.098 R)
- M50: 18,115,704 km (0.112 R)
- M51: 18,304,047 km (0.032 R)
- M52: 18,651,264 km (0.045 R)
- M53: 19,032,290 km (0.078 R)
- M54: 19,641,004 km (0.097 R)
- M55: 19,963,985 km (0.104 R)
- M56: 20,943,253 km (0.086 R)
- M57: 21,075,049 km (0.103 R)
- M58: 21,206,994 km (0.088 R)
- M59: 21,405,660 km (0.06 R)
- M60: 21,938,229 km (0.086 R)
- M61: 22,105,479 km (0.101 R)
- M62: 22,239,668 km (0.078 R)
Planet 6 - Gas Giant
Semi-Major Axis: 6.19 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 264.2
Radius: 13.6
Gravity: 1.43 G
Time & Orbit
Eccentricity (e): 0.127
Orbit Range: 5.4 AU - 6.98 AU
Year: 5682 Days
Day: 11.5 Hours
Environment
Temp: -149 °C
Axial Tilt: 34.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (70)
Outer Limit: 83,643,447 km
- M1: 177,573 km (0.068 R)
- M2: 324,777 km (0.085 R)
- M3: 442,810 km (0.098 R)
- M4: 609,312 km (0.108 R)
- M5: 727,195 km (0.113 R)
- M6: 1,071,869 km (0.11 R)
- M7: 1,605,484 km (0.042 R)
- M8: 1,805,796 km (0.1 R)
- M9: 2,247,259 km (0.094 R)
- M10: 2,842,210 km (0.06 R)
- M11: 3,229,668 km (0.106 R)
- M12: 3,429,681 km (0.099 R)
- M13: 3,540,682 km (0.066 R)
- M14: 4,113,642 km (0.119 R)
- M15: 4,211,928 km (0.113 R)
- M16: 4,431,239 km (0.066 R)
- M17: 4,552,413 km (0.09 R)
- M18: 4,674,634 km (0.075 R)
- M19: 4,777,408 km (0.11 R)
- M20: 5,048,330 km (0.076 R)
- M21: 5,324,188 km (0.065 R)
- M22: 5,539,908 km (0.11 R)
- M23: 5,626,974 km (0.047 R)
- M24: 6,002,315 km (0.12 R)
- M25: 6,272,190 km (0.109 R)
- M26: 6,363,145 km (0.117 R)
- M27: 6,777,382 km (0.113 R)
- M28: 6,870,731 km (0.097 R)
- M29: 6,964,529 km (0.104 R)
- M30: 7,176,958 km (0.093 R)
- M31: 7,681,103 km (0.052 R)
- M32: 7,827,260 km (0.1 R)
- M33: 7,949,780 km (0.095 R)
- M34: 8,221,600 km (0.087 R)
- M35: 8,597,240 km (0.106 R)
- M36: 8,698,368 km (0.061 R)
- M37: 10,316,419 km (0.118 R)
- M38: 10,940,092 km (0.069 R)
- M39: 11,104,800 km (0.051 R)
- M40: 12,280,938 km (0.105 R)
- M41: 12,710,583 km (0.045 R)
- M42: 12,883,817 km (0.099 R)
- M43: 13,028,778 km (0.052 R)
- M44: 13,203,508 km (0.108 R)
- M45: 13,291,172 km (0.085 R)
- M46: 13,466,950 km (0.06 R)
- M47: 13,761,807 km (0.118 R)
- M48: 13,999,219 km (0.114 R)
- M49: 14,871,375 km (0.092 R)
- M50: 15,053,884 km (0.118 R)
- M51: 15,482,931 km (0.077 R)
- M52: 16,071,748 km (0.083 R)
- M53: 16,353,291 km (0.097 R)
- M54: 16,573,200 km (0.066 R)
- M55: 17,881,882 km (0.104 R)
- M56: 18,401,436 km (0.1 R)
- M57: 18,794,579 km (0.119 R)
- M58: 19,522,223 km (0.032 R)
- M59: 20,124,654 km (0.099 R)
- M60: 20,225,632 km (0.093 R)
- M61: 20,495,656 km (0.113 R)
- M62: 20,767,027 km (0.03 R)
- M63: 21,553,762 km (0.034 R)
- M64: 21,864,178 km (0.072 R)
- M65: 22,141,532 km (0.117 R)
- M66: 22,245,802 km (0.086 R)
- M67: 22,454,790 km (0.09 R)
- M68: 22,664,526 km (0.101 R)
- M69: 22,769,544 km (0.089 R)
- M70: 22,980,178 km (0.096 R)
Planet 7 - Gas Giant
Semi-Major Axis: 7.98 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 758.3
Radius: 8.8
Gravity: 9.79 G
Time & Orbit
Eccentricity (e): 0.189
Orbit Range: 6.47 AU - 9.49 AU
Year: 8317 Days
Day: 15 Hours
Environment
Temp: -174 °C
Axial Tilt: 15.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (80)
Outer Limit: 83,643,447 km
- M1: 124,914 km (0.059 R)
- M2: 197,918 km (0.11 R)
- M3: 472,580 km (0.067 R)
- M4: 628,161 km (0.072 R)
- M5: 1,212,640 km (0.057 R)
- M6: 1,330,075 km (0.05 R)
- M7: 1,410,558 km (0.042 R)
- M8: 1,640,490 km (0.069 R)
- M9: 1,705,416 km (0.057 R)
- M10: 2,089,284 km (0.102 R)
- M11: 2,279,273 km (0.095 R)
- M12: 3,394,525 km (0.028 R)
- M13: 4,500,802 km (0.078 R)
- M14: 4,561,987 km (0.086 R)
- M15: 5,220,517 km (0.085 R)
- M16: 5,446,709 km (0.112 R)
- M17: 6,043,156 km (0.069 R)
- M18: 6,144,583 km (0.034 R)
- M19: 6,452,306 km (0.082 R)
- M20: 6,555,977 km (0.111 R)
- M21: 7,623,208 km (0.079 R)
- M22: 7,953,820 km (0.073 R)
- M23: 8,176,870 km (0.103 R)
- M24: 8,515,410 km (0.076 R)
- M25: 10,034,576 km (0.104 R)
- M26: 10,235,337 km (0.079 R)
- M27: 11,175,859 km (0.103 R)
- M28: 12,400,915 km (0.111 R)
- M29: 12,616,486 km (0.057 R)
- M30: 12,702,954 km (0.117 R)
- M31: 13,890,761 km (0.108 R)
- M32: 14,069,680 km (0.069 R)
- M33: 14,611,224 km (0.112 R)
- M34: 15,251,653 km (0.12 R)
- M35: 15,390,031 km (0.116 R)
- M36: 15,854,532 km (0.118 R)
- M37: 16,276,398 km (0.102 R)
- M38: 16,702,153 km (0.036 R)
- M39: 17,806,485 km (0.091 R)
- M40: 18,244,956 km (0.08 R)
- M41: 18,785,902 km (0.1 R)
- M42: 19,132,820 km (0.093 R)
- M43: 20,541,583 km (0.099 R)
- M44: 23,724,577 km (0.043 R)
- M45: 24,153,175 km (0.07 R)
- M46: 24,855,387 km (0.1 R)
- M47: 24,963,995 km (0.099 R)
- M48: 25,072,753 km (0.056 R)
- M49: 25,728,739 km (0.115 R)
- M50: 25,783,642 km (0.085 R)
- M51: 25,948,648 km (0.108 R)
- M52: 26,003,700 km (0.071 R)
- M53: 26,334,910 km (0.048 R)
- M54: 26,778,767 km (0.076 R)
- M55: 27,001,668 km (0.08 R)
- M56: 27,449,265 km (0.093 R)
- M57: 27,730,209 km (0.107 R)
- M58: 29,206,740 km (0.108 R)
- M59: 30,243,753 km (0.047 R)
- M60: 30,708,553 km (0.103 R)
- M61: 31,058,762 km (0.07 R)
- M62: 31,468,810 km (0.118 R)
- M63: 32,176,258 km (0.059 R)
- M64: 32,235,349 km (0.077 R)
- M65: 33,008,022 km (0.118 R)
- M66: 33,426,597 km (0.087 R)
- M67: 34,571,619 km (0.08 R)
- M68: 35,240,471 km (0.063 R)
- M69: 36,652,526 km (0.115 R)
- M70: 37,396,625 km (0.099 R)
- M71: 37,895,385 km (0.064 R)
- M72: 38,271,025 km (0.12 R)
- M73: 38,647,712 km (0.115 R)
- M74: 39,088,876 km (0.112 R)
- M75: 39,468,406 km (0.044 R)
- M76: 39,912,562 km (0.099 R)
- M77: 41,835,344 km (0.081 R)
- M78: 41,964,596 km (0.116 R)
- M79: 43,591,324 km (0.054 R)
- M80: 43,853,569 km (0.079 R)
Planet 8 - Gas Giant
Semi-Major Axis: 8.85 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 734.4
Radius: 13.2
Gravity: 4.21 G
Time & Orbit
Eccentricity (e): 0.166
Orbit Range: 7.38 AU - 10.32 AU
Year: 9714 Days
Day: 11.6 Hours
Environment
Temp: -163 °C
Axial Tilt: 15.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (82)
Outer Limit: 83,643,447 km
- M1: 165,605 km (0.053 R)
- M2: 320,588 km (0.117 R)
- M3: 478,115 km (0.109 R)
- M4: 637,287 km (0.091 R)
- M5: 782,696 km (0.095 R)
- M6: 1,437,336 km (0.058 R)
- M7: 1,842,597 km (0.074 R)
- M8: 1,985,762 km (0.114 R)
- M9: 2,490,057 km (0.11 R)
- M10: 3,005,870 km (0.096 R)
- M11: 3,090,542 km (0.089 R)
- M12: 3,204,536 km (0.047 R)
- M13: 3,949,085 km (0.04 R)
- M14: 4,911,448 km (0.096 R)
- M15: 5,146,316 km (0.105 R)
- M16: 5,873,063 km (0.117 R)
- M17: 6,339,060 km (0.062 R)
- M18: 6,448,416 km (0.047 R)
- M19: 6,558,371 km (0.087 R)
- M20: 6,668,923 km (0.112 R)
- M21: 7,498,743 km (0.096 R)
- M22: 7,614,382 km (0.114 R)
- M23: 8,162,359 km (0.112 R)
- M24: 8,601,728 km (0.067 R)
- M25: 8,844,825 km (0.113 R)
- M26: 9,296,161 km (0.108 R)
- M27: 9,462,215 km (0.055 R)
- M28: 9,671,203 km (0.093 R)
- M29: 9,755,128 km (0.09 R)
- M30: 10,178,938 km (0.036 R)
- M31: 12,023,779 km (0.07 R)
- M32: 12,386,704 km (0.092 R)
- M33: 13,310,171 km (0.102 R)
- M34: 13,732,935 km (0.109 R)
- M35: 14,255,630 km (0.072 R)
- M36: 14,351,373 km (0.093 R)
- M37: 15,271,848 km (0.106 R)
- M38: 16,461,600 km (0.108 R)
- M39: 16,612,395 km (0.057 R)
- M40: 16,864,766 km (0.088 R)
- M41: 17,169,348 km (0.09 R)
- M42: 17,887,118 km (0.094 R)
- M43: 18,771,840 km (0.058 R)
- M44: 19,087,492 km (0.113 R)
- M45: 21,018,351 km (0.052 R)
- M46: 21,730,736 km (0.101 R)
- M47: 22,284,248 km (0.088 R)
- M48: 22,506,850 km (0.113 R)
- M49: 23,461,584 km (0.05 R)
- M50: 25,294,307 km (0.086 R)
- M51: 26,110,513 km (0.03 R)
- M52: 26,345,382 km (0.058 R)
- M53: 26,639,790 km (0.113 R)
- M54: 27,113,268 km (0.062 R)
- M55: 27,529,898 km (0.026 R)
- M56: 27,828,794 km (0.068 R)
- M57: 27,948,622 km (0.092 R)
- M58: 28,369,441 km (0.086 R)
- M59: 28,610,892 km (0.115 R)
- M60: 30,752,236 km (0.103 R)
- M61: 31,936,153 km (0.1 R)
- M62: 32,313,140 km (0.099 R)
- M63: 32,628,492 km (0.105 R)
- M64: 33,135,031 km (0.063 R)
- M65: 33,708,140 km (0.07 R)
- M66: 33,963,803 km (0.108 R)
- M67: 34,092,008 km (0.082 R)
- M68: 35,837,217 km (0.082 R)
- M69: 36,753,504 km (0.113 R)
- M70: 36,885,001 km (0.12 R)
- M71: 37,082,619 km (0.082 R)
- M72: 37,942,957 km (0.12 R)
- M73: 39,413,953 km (0.059 R)
- M74: 40,359,710 km (0.074 R)
- M75: 40,767,215 km (0.05 R)
- M76: 41,107,999 km (0.11 R)
- M77: 41,518,047 km (0.064 R)
- M78: 42,067,071 km (0.116 R)
- M79: 44,146,930 km (0.097 R)
- M80: 44,356,816 km (0.073 R)
- M81: 44,847,646 km (0.099 R)
- M82: 45,481,493 km (0.097 R)
Planet 9 - Ice Giant
Semi-Major Axis: 15.08 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 779.7
Radius: 6.2
Gravity: 20.28 G
Time & Orbit
Eccentricity (e): 0.176
Orbit Range: 12.43 AU - 17.73 AU
Year: 21606 Days
Day: 17.1 Hours
Environment
Temp: -189 °C
Axial Tilt: 18.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (95)
Outer Limit: 83,643,447 km
- M1: 115,938 km (0.113 R)
- M2: 427,401 km (0.093 R)
- M3: 770,878 km (0.036 R)
- M4: 848,370 km (0.119 R)
- M5: 983,456 km (0.115 R)
- M6: 1,184,516 km (0.042 R)
- M7: 2,184,727 km (0.102 R)
- M8: 2,295,879 km (0.047 R)
- M9: 2,447,122 km (0.05 R)
- M10: 2,719,689 km (0.067 R)
- M11: 3,550,855 km (0.086 R)
- M12: 3,638,071 km (0.051 R)
- M13: 4,222,250 km (0.089 R)
- M14: 6,352,823 km (0.084 R)
- M15: 6,943,436 km (0.045 R)
- M16: 9,718,775 km (0.06 R)
- M17: 11,028,355 km (0.079 R)
- M18: 11,155,812 km (0.103 R)
- M19: 11,284,018 km (0.06 R)
- M20: 12,062,675 km (0.097 R)
- M21: 12,657,925 km (0.07 R)
- M22: 13,060,193 km (0.05 R)
- M23: 13,127,662 km (0.078 R)
- M24: 13,877,147 km (0.093 R)
- M25: 14,084,041 km (0.12 R)
- M26: 15,275,139 km (0.108 R)
- M27: 15,703,288 km (0.068 R)
- M28: 16,135,327 km (0.054 R)
- M29: 16,280,287 km (0.071 R)
- M30: 17,084,825 km (0.111 R)
- M31: 18,202,770 km (0.1 R)
- M32: 18,278,017 km (0.09 R)
- M33: 19,037,376 km (0.102 R)
- M34: 19,190,564 km (0.051 R)
- M35: 20,039,981 km (0.067 R)
- M36: 20,430,132 km (0.103 R)
- M37: 20,508,372 km (0.118 R)
- M38: 22,579,854 km (0.107 R)
- M39: 23,067,244 km (0.09 R)
- M40: 23,394,115 km (0.116 R)
- M41: 24,052,495 km (0.096 R)
- M42: 24,467,031 km (0.072 R)
- M43: 26,489,594 km (0.104 R)
- M44: 29,180,261 km (0.118 R)
- M45: 29,533,612 km (0.073 R)
- M46: 31,322,204 km (0.078 R)
- M47: 31,412,561 km (0.094 R)
- M48: 32,778,240 km (0.119 R)
- M49: 34,722,414 km (0.087 R)
- M50: 35,190,805 km (0.089 R)
- M51: 37,467,983 km (0.078 R)
- M52: 38,624,375 km (0.116 R)
- M53: 38,721,165 km (0.119 R)
- M54: 40,873,280 km (0.112 R)
- M55: 41,367,701 km (0.087 R)
- M56: 42,662,620 km (0.101 R)
- M57: 45,906,500 km (0.071 R)
- M58: 46,214,672 km (0.109 R)
- M59: 46,420,369 km (0.095 R)
- M60: 47,973,793 km (0.074 R)
- M61: 48,182,183 km (0.08 R)
- M62: 49,544,122 km (0.11 R)
- M63: 49,649,289 km (0.068 R)
- M64: 49,965,689 km (0.109 R)
- M65: 51,344,084 km (0.069 R)
- M66: 51,557,261 km (0.116 R)
- M67: 52,950,017 km (0.075 R)
- M68: 54,246,581 km (0.107 R)
- M69: 54,355,040 km (0.045 R)
- M70: 55,225,849 km (0.032 R)
- M71: 56,101,146 km (0.083 R)
- M72: 56,210,951 km (0.094 R)
- M73: 56,540,515 km (0.107 R)
- M74: 57,644,099 km (0.111 R)
- M75: 58,977,614 km (0.101 R)
- M76: 59,872,359 km (0.115 R)
- M77: 60,658,795 km (0.06 R)
- M78: 61,109,833 km (0.116 R)
- M79: 62,015,049 km (0.118 R)
- M80: 63,495,619 km (0.119 R)
- M81: 64,642,437 km (0.061 R)
- M82: 65,680,347 km (0.103 R)
- M83: 66,027,563 km (0.119 R)
- M84: 66,491,466 km (0.07 R)
- M85: 67,772,772 km (0.086 R)
- M86: 68,944,722 km (0.086 R)
- M87: 69,769,006 km (0.101 R)
- M88: 72,022,698 km (0.039 R)
- M89: 72,261,307 km (0.074 R)
- M90: 75,872,150 km (0.11 R)
- M91: 77,577,117 km (0.069 R)
- M92: 78,434,463 km (0.073 R)
- M93: 79,787,875 km (0.044 R)
- M94: 81,397,398 km (0.11 R)
- M95: 83,267,671 km (0.064 R)
Kuiper Belt
Range: 30 - 48 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 407 - 13,414 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.