Star System Generated (Seed: 1767330154)
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)
Planet 1 - Gas Giant
Semi-Major Axis: 0.65 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 928.4
Radius: 12.3
Gravity: 6.14 G
Time & Orbit
Eccentricity (e): 0.189
Orbit Range: 0.53 AU - 0.77 AU
Year: 355 Days
Day: 5.7 Hours
Environment
Temp: -161 °C
Axial Tilt: 0.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (44)
Outer Limit: 95,452,064 km
- M1: 153,487 km (0.102 R)
- M2: 279,299 km (0.099 R)
- M3: 356,641 km (0.077 R)
- M4: 490,232 km (0.053 R)
- M5: 575,653 km (0.101 R)
- M6: 701,614 km (0.116 R)
- M7: 784,790 km (0.097 R)
- M8: 880,084 km (0.113 R)
- M9: 962,214 km (0.113 R)
- M10: 1,060,948 km (0.057 R)
- M11: 1,158,636 km (0.055 R)
- M12: 1,235,230 km (0.105 R)
- M13: 1,388,867 km (0.114 R)
- M14: 1,470,697 km (0.102 R)
- M15: 1,559,707 km (0.052 R)
- M16: 1,645,128 km (0.069 R)
- M17: 1,837,810 km (0.12 R)
- M18: 1,939,985 km (0.032 R)
- M19: 2,055,624 km (0.117 R)
- M20: 2,191,758 km (0.082 R)
- M21: 2,276,132 km (0.066 R)
- M22: 2,386,236 km (0.082 R)
- M23: 2,466,869 km (0.091 R)
- M24: 2,580,264 km (0.12 R)
- M25: 2,970,565 km (0.072 R)
- M26: 3,098,172 km (0.099 R)
- M27: 3,241,337 km (0.108 R)
- M28: 3,324,214 km (0.113 R)
- M29: 3,634,181 km (0.097 R)
- M30: 3,763,733 km (0.097 R)
- M31: 3,843,618 km (0.073 R)
- M32: 3,983,193 km (0.119 R)
- M33: 4,131,744 km (0.086 R)
- M34: 4,304,978 km (0.103 R)
- M35: 4,511,573 km (0.092 R)
- M36: 4,643,219 km (0.097 R)
- M37: 4,744,796 km (0.068 R)
- M38: 4,831,413 km (0.096 R)
- M39: 4,966,201 km (0.084 R)
- M40: 5,054,164 km (0.116 R)
- M41: 5,191,046 km (0.084 R)
- M42: 5,280,356 km (0.111 R)
- M43: 5,501,611 km (0.093 R)
- M44: 5,625,927 km (0.054 R)
Planet 2 - Gas Giant
Semi-Major Axis: 2.16 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 287.3
Radius: 12
Gravity: 2 G
Time & Orbit
Eccentricity (e): 0.081
Orbit Range: 1.99 AU - 2.33 AU
Year: 2153 Days
Day: 5.6 Hours
Environment
Temp: -194 °C
Axial Tilt: 14.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (59)
Outer Limit: 95,452,064 km
- M1: 208,988 km (0.063 R)
- M2: 345,870 km (0.099 R)
- M3: 582,684 km (0.034 R)
- M4: 712,235 km (0.085 R)
- M5: 845,378 km (0.101 R)
- M6: 934,239 km (0.107 R)
- M7: 1,010,833 km (0.06 R)
- M8: 1,105,977 km (0.073 R)
- M9: 1,187,807 km (0.081 R)
- M10: 1,357,750 km (0.07 R)
- M11: 1,454,989 km (0.108 R)
- M12: 1,563,747 km (0.116 R)
- M13: 1,656,497 km (0.099 R)
- M14: 1,770,491 km (0.104 R)
- M15: 1,956,441 km (0.119 R)
- M16: 2,180,090 km (0.101 R)
- M17: 2,326,995 km (0.109 R)
- M18: 2,981,785 km (0.042 R)
- M19: 3,086,503 km (0.096 R)
- M20: 3,180,750 km (0.093 R)
- M21: 3,311,947 km (0.048 R)
- M22: 3,592,294 km (0.07 R)
- M23: 3,679,060 km (0.08 R)
- M24: 3,842,272 km (0.115 R)
- M25: 3,969,430 km (0.063 R)
- M26: 4,046,473 km (0.082 R)
- M27: 4,346,267 km (0.12 R)
- M28: 5,009,434 km (0.105 R)
- M29: 5,092,760 km (0.101 R)
- M30: 5,176,685 km (0.053 R)
- M31: 5,431,001 km (0.114 R)
- M32: 5,574,166 km (0.116 R)
- M33: 6,383,790 km (0.055 R)
- M34: 6,565,402 km (0.119 R)
- M35: 6,672,215 km (0.076 R)
- M36: 6,764,068 km (0.105 R)
- M37: 7,011,353 km (0.12 R)
- M38: 7,690,677 km (0.101 R)
- M39: 7,787,168 km (0.066 R)
- M40: 8,079,033 km (0.088 R)
- M41: 8,308,516 km (0.071 R)
- M42: 8,925,607 km (0.114 R)
- M43: 9,402,376 km (0.096 R)
- M44: 9,695,887 km (0.049 R)
- M45: 9,835,162 km (0.061 R)
- M46: 10,027,545 km (0.096 R)
- M47: 10,345,291 km (0.047 R)
- M48: 10,487,559 km (0.053 R)
- M49: 10,576,869 km (0.106 R)
- M50: 10,684,280 km (0.118 R)
- M51: 10,828,043 km (0.077 R)
- M52: 11,226,871 km (0.103 R)
- M53: 11,336,527 km (0.101 R)
- M54: 11,428,230 km (0.117 R)
- M55: 11,538,484 km (0.098 R)
- M56: 12,339,132 km (0.07 R)
- M57: 12,433,378 km (0.091 R)
- M58: 12,603,770 km (0.089 R)
- M59: 12,698,615 km (0.11 R)
Planet 3 - Gas Giant
Semi-Major Axis: 2.37 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 735.6
Radius: 8.1
Gravity: 11.21 G
Time & Orbit
Eccentricity (e): 0.13
Orbit Range: 2.06 AU - 2.68 AU
Year: 2475 Days
Day: 8.5 Hours
Environment
Temp: -198 °C
Axial Tilt: 41.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (73)
Outer Limit: 95,452,064 km
- M1: 139,724 km (0.058 R)
- M2: 200,760 km (0.069 R)
- M3: 260,450 km (0.116 R)
- M4: 342,280 km (0.104 R)
- M5: 412,292 km (0.077 R)
- M6: 620,382 km (0.091 R)
- M7: 755,619 km (0.025 R)
- M8: 890,855 km (0.089 R)
- M9: 971,788 km (0.096 R)
- M10: 1,076,656 km (0.043 R)
- M11: 1,196,633 km (0.098 R)
- M12: 1,437,935 km (0.094 R)
- M13: 1,707,360 km (0.041 R)
- M14: 2,059,813 km (0.086 R)
- M15: 2,168,571 km (0.075 R)
- M16: 2,392,070 km (0.112 R)
- M17: 2,550,045 km (0.06 R)
- M18: 2,861,209 km (0.1 R)
- M19: 2,982,982 km (0.101 R)
- M20: 3,832,548 km (0.089 R)
- M21: 4,154,482 km (0.077 R)
- M22: 4,538,201 km (0.098 R)
- M23: 4,662,816 km (0.098 R)
- M24: 4,716,522 km (0.118 R)
- M25: 4,951,540 km (0.092 R)
- M26: 5,061,494 km (0.09 R)
- M27: 5,546,640 km (0.089 R)
- M28: 5,891,463 km (0.102 R)
- M29: 6,203,674 km (0.109 R)
- M30: 6,302,409 km (0.089 R)
- M31: 6,561,512 km (0.095 R)
- M32: 6,803,711 km (0.065 R)
- M33: 7,048,902 km (0.075 R)
- M34: 7,780,735 km (0.091 R)
- M35: 7,951,276 km (0.107 R)
- M36: 8,231,324 km (0.095 R)
- M37: 9,045,884 km (0.111 R)
- M38: 9,202,812 km (0.092 R)
- M39: 9,315,609 km (0.109 R)
- M40: 9,747,947 km (0.038 R)
- M41: 9,839,800 km (0.069 R)
- M42: 10,093,967 km (0.09 R)
- M43: 10,280,216 km (0.094 R)
- M44: 10,373,715 km (0.113 R)
- M45: 10,608,883 km (0.116 R)
- M46: 10,988,562 km (0.096 R)
- M47: 11,252,303 km (0.067 R)
- M48: 11,348,794 km (0.109 R)
- M49: 11,810,453 km (0.119 R)
- M50: 12,427,245 km (0.094 R)
- M51: 12,502,044 km (0.115 R)
- M52: 12,777,304 km (0.038 R)
- M53: 13,004,094 km (0.088 R)
- M54: 13,206,799 km (0.11 R)
- M55: 13,461,564 km (0.107 R)
- M56: 13,743,706 km (0.116 R)
- M57: 14,157,643 km (0.099 R)
- M58: 14,261,763 km (0.106 R)
- M59: 14,759,924 km (0.095 R)
- M60: 15,050,892 km (0.108 R)
- M61: 15,103,999 km (0.094 R)
- M62: 15,210,364 km (0.063 R)
- M63: 17,140,176 km (0.085 R)
- M64: 17,195,677 km (0.074 R)
- M65: 17,585,678 km (0.049 R)
- M66: 17,725,702 km (0.099 R)
- M67: 17,978,523 km (0.069 R)
- M68: 18,091,319 km (0.099 R)
- M69: 18,176,141 km (0.112 R)
- M70: 18,973,498 km (0.114 R)
- M71: 19,059,517 km (0.056 R)
- M72: 19,174,557 km (0.062 R)
- M73: 19,261,025 km (0.043 R)
Planet 4 - Gas Giant
Semi-Major Axis: 4.36 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 259.1
Radius: 12.7
Gravity: 1.61 G
Time & Orbit
Eccentricity (e): 0.028
Orbit Range: 4.24 AU - 4.48 AU
Year: 6175 Days
Day: 7.5 Hours
Environment
Temp: -228 °C
Axial Tilt: 8.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (76)
Outer Limit: 95,452,064 km
- M1: 162,014 km (0.036 R)
- M2: 256,710 km (0.098 R)
- M3: 350,358 km (0.114 R)
- M4: 543,489 km (0.106 R)
- M5: 670,946 km (0.108 R)
- M6: 947,852 km (0.106 R)
- M7: 1,275,172 km (0.032 R)
- M8: 1,424,621 km (0.081 R)
- M9: 1,551,480 km (0.104 R)
- M10: 1,771,538 km (0.109 R)
- M11: 1,908,719 km (0.118 R)
- M12: 2,065,498 km (0.105 R)
- M13: 2,226,615 km (0.069 R)
- M14: 2,408,825 km (0.104 R)
- M15: 2,665,535 km (0.118 R)
- M16: 2,788,355 km (0.114 R)
- M17: 3,021,727 km (0.114 R)
- M18: 3,113,132 km (0.093 R)
- M19: 3,488,622 km (0.097 R)
- M20: 3,740,545 km (0.054 R)
- M21: 3,898,521 km (0.08 R)
- M22: 4,038,694 km (0.078 R)
- M23: 4,180,512 km (0.066 R)
- M24: 4,511,124 km (0.081 R)
- M25: 4,807,328 km (0.075 R)
- M26: 5,022,898 km (0.106 R)
- M27: 5,307,882 km (0.043 R)
- M28: 5,508,493 km (0.075 R)
- M29: 5,643,430 km (0.107 R)
- M30: 5,756,975 km (0.086 R)
- M31: 6,009,197 km (0.063 R)
- M32: 6,194,848 km (0.046 R)
- M33: 6,406,080 km (0.109 R)
- M34: 6,595,920 km (0.113 R)
- M35: 7,127,591 km (0.085 R)
- M36: 7,622,909 km (0.036 R)
- M37: 7,773,704 km (0.065 R)
- M38: 8,155,178 km (0.108 R)
- M39: 8,438,666 km (0.083 R)
- M40: 8,857,092 km (0.1 R)
- M41: 8,936,229 km (0.103 R)
- M42: 9,795,818 km (0.099 R)
- M43: 10,180,285 km (0.112 R)
- M44: 10,374,313 km (0.106 R)
- M45: 10,681,737 km (0.106 R)
- M46: 10,794,384 km (0.045 R)
- M47: 11,105,847 km (0.083 R)
- M48: 11,191,417 km (0.096 R)
- M49: 12,322,676 km (0.109 R)
- M50: 12,827,269 km (0.09 R)
- M51: 13,368,963 km (0.115 R)
- M52: 13,459,919 km (0.111 R)
- M53: 13,795,467 km (0.116 R)
- M54: 13,979,622 km (0.088 R)
- M55: 14,133,708 km (0.091 R)
- M56: 15,133,171 km (0.05 R)
- M57: 15,418,454 km (0.119 R)
- M58: 15,673,519 km (0.05 R)
- M59: 15,865,602 km (0.116 R)
- M60: 16,838,437 km (0.084 R)
- M61: 17,431,443 km (0.05 R)
- M62: 17,697,129 km (0.069 R)
- M63: 18,502,414 km (0.087 R)
- M64: 18,841,553 km (0.111 R)
- M65: 19,148,378 km (0.06 R)
- M66: 20,079,176 km (0.028 R)
- M67: 20,183,595 km (0.108 R)
- M68: 20,848,408 km (0.11 R)
- M69: 22,560,256 km (0.087 R)
- M70: 22,813,675 km (0.082 R)
- M71: 22,958,935 km (0.071 R)
- M72: 23,140,846 km (0.076 R)
- M73: 23,250,351 km (0.101 R)
- M74: 23,396,509 km (0.059 R)
- M75: 24,094,831 km (0.1 R)
- M76: 24,316,835 km (0.109 R)
Planet 5 - Gas Giant
Semi-Major Axis: 5.12 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 495.9
Radius: 13.4
Gravity: 2.76 G
Time & Orbit
Eccentricity (e): 0.195
Orbit Range: 4.12 AU - 6.12 AU
Year: 7858 Days
Day: 13.5 Hours
Environment
Temp: -224 °C
Axial Tilt: 29.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (81)
Outer Limit: 95,452,064 km
- M1: 172,636 km (0.106 R)
- M2: 415,882 km (0.086 R)
- M3: 611,855 km (0.109 R)
- M4: 946,207 km (0.033 R)
- M5: 1,355,058 km (0.084 R)
- M6: 1,443,619 km (0.081 R)
- M7: 1,916,349 km (0.08 R)
- M8: 2,746,467 km (0.057 R)
- M9: 2,860,311 km (0.119 R)
- M10: 2,975,950 km (0.081 R)
- M11: 3,140,508 km (0.108 R)
- M12: 3,528,116 km (0.049 R)
- M13: 3,702,697 km (0.06 R)
- M14: 4,322,780 km (0.076 R)
- M15: 4,947,650 km (0.101 R)
- M16: 5,059,250 km (0.093 R)
- M17: 5,456,582 km (0.112 R)
- M18: 5,805,295 km (0.11 R)
- M19: 6,041,809 km (0.119 R)
- M20: 7,559,480 km (0.071 R)
- M21: 8,046,869 km (0.094 R)
- M22: 8,344,270 km (0.075 R)
- M23: 8,746,389 km (0.066 R)
- M24: 9,052,167 km (0.091 R)
- M25: 9,674,345 km (0.098 R)
- M26: 10,167,868 km (0.106 R)
- M27: 12,147,796 km (0.099 R)
- M28: 12,375,035 km (0.063 R)
- M29: 12,489,178 km (0.078 R)
- M30: 13,220,263 km (0.085 R)
- M31: 15,088,142 km (0.11 R)
- M32: 15,537,235 km (0.112 R)
- M33: 16,156,720 km (0.037 R)
- M34: 16,281,634 km (0.075 R)
- M35: 16,406,698 km (0.099 R)
- M36: 16,532,210 km (0.045 R)
- M37: 16,616,135 km (0.094 R)
- M38: 17,207,046 km (0.093 R)
- M39: 17,292,018 km (0.058 R)
- M40: 17,847,924 km (0.101 R)
- M41: 17,977,027 km (0.073 R)
- M42: 18,496,580 km (0.065 R)
- M43: 18,670,861 km (0.111 R)
- M44: 18,845,741 km (0.083 R)
- M45: 19,021,070 km (0.092 R)
- M46: 19,329,391 km (0.106 R)
- M47: 19,594,927 km (0.074 R)
- M48: 20,219,199 km (0.07 R)
- M49: 20,398,717 km (0.114 R)
- M50: 21,076,994 km (0.091 R)
- M51: 21,487,341 km (0.095 R)
- M52: 21,900,530 km (0.047 R)
- M53: 22,316,262 km (0.077 R)
- M54: 22,408,863 km (0.098 R)
- M55: 22,594,814 km (0.119 R)
- M56: 23,296,428 km (0.101 R)
- M57: 24,100,217 km (0.088 R)
- M58: 24,195,361 km (0.047 R)
- M59: 24,433,820 km (0.046 R)
- M60: 24,912,982 km (0.113 R)
- M61: 25,202,155 km (0.094 R)
- M62: 25,298,646 km (0.113 R)
- M63: 25,443,905 km (0.075 R)
- M64: 26,075,956 km (0.113 R)
- M65: 26,861,046 km (0.054 R)
- M66: 28,454,562 km (0.092 R)
- M67: 28,706,186 km (0.115 R)
- M68: 29,516,857 km (0.087 R)
- M69: 29,924,960 km (0.118 R)
- M70: 30,437,632 km (0.087 R)
- M71: 30,901,684 km (0.088 R)
- M72: 31,680,191 km (0.104 R)
- M73: 32,307,605 km (0.06 R)
- M74: 33,256,504 km (0.109 R)
- M75: 33,894,240 km (0.053 R)
- M76: 34,750,837 km (0.072 R)
- M77: 35,019,964 km (0.112 R)
- M78: 35,127,824 km (0.066 R)
- M79: 35,614,466 km (0.027 R)
- M80: 35,994,594 km (0.071 R)
- M81: 36,103,352 km (0.119 R)
Planet 6 - Ice Giant
Semi-Major Axis: 10.64 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 976.2
Radius: 5.3
Gravity: 34.75 G
Time & Orbit
Eccentricity (e): 0.204
Orbit Range: 8.47 AU - 12.81 AU
Year: 23540 Days
Day: 19 Hours
Environment
Temp: -243 °C
Axial Tilt: 37.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (94)
Outer Limit: 95,452,064 km
- M1: 99,632 km (0.113 R)
- M2: 489,035 km (0.078 R)
- M3: 586,573 km (0.117 R)
- M4: 717,471 km (0.074 R)
- M5: 976,425 km (0.083 R)
- M6: 1,132,306 km (0.113 R)
- M7: 1,364,033 km (0.052 R)
- M8: 1,870,422 km (0.04 R)
- M9: 2,429,769 km (0.114 R)
- M10: 2,903,096 km (0.071 R)
- M11: 3,883,262 km (0.115 R)
- M12: 4,849,963 km (0.116 R)
- M13: 5,062,542 km (0.085 R)
- M14: 5,116,247 km (0.074 R)
- M15: 6,227,909 km (0.079 R)
- M16: 6,285,504 km (0.1 R)
- M17: 6,634,217 km (0.098 R)
- M18: 7,108,891 km (0.084 R)
- M19: 7,717,605 km (0.115 R)
- M20: 9,049,325 km (0.078 R)
- M21: 9,114,549 km (0.065 R)
- M22: 9,376,795 km (0.063 R)
- M23: 10,178,340 km (0.096 R)
- M24: 13,896,745 km (0.039 R)
- M25: 14,122,937 km (0.098 R)
- M26: 14,578,761 km (0.047 R)
- M27: 15,116,715 km (0.067 R)
- M28: 17,738,867 km (0.045 R)
- M29: 18,643,784 km (0.082 R)
- M30: 19,143,591 km (0.087 R)
- M31: 19,479,288 km (0.097 R)
- M32: 20,841,227 km (0.114 R)
- M33: 22,498,173 km (0.032 R)
- M34: 22,674,998 km (0.028 R)
- M35: 23,656,061 km (0.085 R)
- M36: 25,843,930 km (0.107 R)
- M37: 26,868,226 km (0.111 R)
- M38: 27,905,538 km (0.097 R)
- M39: 28,286,115 km (0.117 R)
- M40: 28,381,558 km (0.088 R)
- M41: 28,477,002 km (0.118 R)
- M42: 28,764,080 km (0.114 R)
- M43: 31,588,937 km (0.117 R)
- M44: 32,983,937 km (0.105 R)
- M45: 33,992,526 km (0.1 R)
- M46: 36,662,100 km (0.054 R)
- M47: 36,974,460 km (0.104 R)
- M48: 38,867,023 km (0.094 R)
- M49: 43,183,819 km (0.103 R)
- M50: 43,844,443 km (0.081 R)
- M51: 44,619,211 km (0.092 R)
- M52: 46,857,793 km (0.114 R)
- M53: 47,649,914 km (0.079 R)
- M54: 47,990,847 km (0.063 R)
- M55: 48,332,379 km (0.106 R)
- M56: 49,707,034 km (0.11 R)
- M57: 50,399,223 km (0.1 R)
- M58: 51,676,340 km (0.042 R)
- M59: 52,611,926 km (0.077 R)
- M60: 52,729,210 km (0.115 R)
- M61: 53,199,396 km (0.087 R)
- M62: 54,499,701 km (0.094 R)
- M63: 56,649,722 km (0.066 R)
- M64: 57,614,179 km (0.048 R)
- M65: 58,584,172 km (0.105 R)
- M66: 58,827,418 km (0.078 R)
- M67: 60,540,014 km (0.112 R)
- M68: 60,909,222 km (0.094 R)
- M69: 61,402,446 km (0.067 R)
- M70: 62,145,050 km (0.061 R)
- M71: 67,424,808 km (0.085 R)
- M72: 68,574,766 km (0.081 R)
- M73: 69,345,046 km (0.081 R)
- M74: 69,989,065 km (0.046 R)
- M75: 70,894,132 km (0.114 R)
- M76: 71,412,937 km (0.092 R)
- M77: 72,585,036 km (0.186 R)
- M78: 73,108,031 km (0.217 R)
- M79: 75,476,913 km (0.081 R)
- M80: 77,069,981 km (0.101 R)
- M81: 77,336,564 km (0.12 R)
- M82: 79,615,089 km (0.118 R)
- M83: 80,559,800 km (0.079 R)
- M84: 81,101,194 km (0.116 R)
- M85: 81,372,266 km (0.179 R)
- M86: 83,963,451 km (0.046 R)
- M87: 85,062,546 km (0.097 R)
- M88: 85,475,885 km (0.088 R)
- M89: 85,889,972 km (0.106 R)
- M90: 86,997,445 km (0.177 R)
- M91: 90,769,555 km (0.101 R)
- M92: 91,756,303 km (0.112 R)
- M93: 92,463,302 km (0.181 R)
- M94: 94,880,355 km (0.091 R)
Kuiper Belt
Range: 30 - 47 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 425 - 13,012 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.