Star System Generated (Seed: 1766616123)
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: 0.7 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 754
Radius: 8.2
Gravity: 11.21 G
Time & Orbit
Eccentricity (e): 0.151
Orbit Range: 0.59 AU - 0.81 AU
Year: 397 Days
Day: 12.8 Hours
Environment
Temp: -151 °C
Axial Tilt: 36.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (48)
Outer Limit: 71,518,421 km
- M1: 103,971 km (0.12 R)
- M2: 161,566 km (0.082 R)
- M3: 215,870 km (0.096 R)
- M4: 273,016 km (0.12 R)
- M5: 346,169 km (0.101 R)
- M6: 411,245 km (0.07 R)
- M7: 505,641 km (0.103 R)
- M8: 574,456 km (0.08 R)
- M9: 631,153 km (0.097 R)
- M10: 693,985 km (0.098 R)
- M11: 775,815 km (0.088 R)
- M12: 839,394 km (0.107 R)
- M13: 896,091 km (0.082 R)
- M14: 1,008,888 km (0.081 R)
- M15: 1,314,367 km (0.093 R)
- M16: 1,432,998 km (0.081 R)
- M17: 1,714,541 km (0.065 R)
- M18: 1,978,282 km (0.083 R)
- M19: 2,049,192 km (0.076 R)
- M20: 2,133,116 km (0.111 R)
- M21: 2,273,439 km (0.103 R)
- M22: 2,492,899 km (0.059 R)
- M23: 2,550,494 km (0.105 R)
- M24: 2,811,692 km (0.092 R)
- M25: 2,938,850 km (0.063 R)
- M26: 3,033,845 km (0.083 R)
- M27: 3,199,001 km (0.032 R)
- M28: 3,268,713 km (0.068 R)
- M29: 3,409,635 km (0.118 R)
- M30: 3,567,012 km (0.108 R)
- M31: 3,624,756 km (0.117 R)
- M32: 3,778,094 km (0.111 R)
- M33: 3,859,326 km (0.04 R)
- M34: 3,918,716 km (0.036 R)
- M35: 4,030,915 km (0.103 R)
- M36: 4,159,419 km (0.071 R)
- M37: 4,227,935 km (0.099 R)
- M38: 4,366,163 km (0.119 R)
- M39: 4,435,876 km (0.096 R)
- M40: 4,553,011 km (0.051 R)
- M41: 4,647,258 km (0.086 R)
- M42: 4,974,728 km (0.109 R)
- M43: 5,112,657 km (0.105 R)
- M44: 5,268,239 km (0.102 R)
- M45: 5,400,633 km (0.073 R)
- M46: 5,517,319 km (0.087 R)
- M47: 5,626,376 km (0.107 R)
- M48: 5,727,803 km (0.073 R)
Planet 2 - Gas Giant
Semi-Major Axis: 3.48 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 681.8
Radius: 11.7
Gravity: 4.98 G
Time & Orbit
Eccentricity (e): 0.144
Orbit Range: 2.98 AU - 3.98 AU
Year: 4403 Days
Day: 8.8 Hours
Environment
Temp: -222 °C
Axial Tilt: 0.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (76)
Outer Limit: 71,518,421 km
- M1: 165,156 km (0.09 R)
- M2: 303,235 km (0.048 R)
- M3: 408,552 km (0.101 R)
- M4: 840,441 km (0.113 R)
- M5: 1,164,470 km (0.111 R)
- M6: 1,305,241 km (0.099 R)
- M7: 1,604,288 km (0.078 R)
- M8: 1,794,426 km (0.053 R)
- M9: 1,992,195 km (0.111 R)
- M10: 2,628,435 km (0.092 R)
- M11: 2,740,483 km (0.029 R)
- M12: 2,892,325 km (0.075 R)
- M13: 2,969,368 km (0.087 R)
- M14: 3,344,709 km (0.12 R)
- M15: 3,548,461 km (0.114 R)
- M16: 3,631,040 km (0.044 R)
- M17: 4,119,028 km (0.056 R)
- M18: 4,582,781 km (0.097 R)
- M19: 5,016,765 km (0.113 R)
- M20: 5,392,554 km (0.106 R)
- M21: 5,729,000 km (0.096 R)
- M22: 5,973,443 km (0.075 R)
- M23: 6,121,844 km (0.066 R)
- M24: 6,246,459 km (0.087 R)
- M25: 6,753,297 km (0.094 R)
- M26: 6,830,489 km (0.11 R)
- M27: 7,672,127 km (0.09 R)
- M28: 7,941,852 km (0.09 R)
- M29: 8,050,609 km (0.107 R)
- M30: 8,132,589 km (0.078 R)
- M31: 8,741,752 km (0.036 R)
- M32: 8,995,320 km (0.107 R)
- M33: 9,423,319 km (0.085 R)
- M34: 10,004,208 km (0.09 R)
- M35: 10,092,321 km (0.088 R)
- M36: 10,417,846 km (0.105 R)
- M37: 10,686,673 km (0.106 R)
- M38: 10,806,950 km (0.112 R)
- M39: 10,988,113 km (0.101 R)
- M40: 11,109,587 km (0.112 R)
- M41: 11,200,841 km (0.092 R)
- M42: 11,537,885 km (0.076 R)
- M43: 11,723,088 km (0.066 R)
- M44: 12,034,102 km (0.11 R)
- M45: 12,190,581 km (0.039 R)
- M46: 12,823,380 km (0.082 R)
- M47: 13,337,249 km (0.03 R)
- M48: 13,596,801 km (0.112 R)
- M49: 14,352,121 km (0.115 R)
- M50: 14,818,716 km (0.112 R)
- M51: 14,952,906 km (0.11 R)
- M52: 15,188,672 km (0.064 R)
- M53: 15,425,784 km (0.115 R)
- M54: 15,937,858 km (0.106 R)
- M55: 16,908,898 km (0.113 R)
- M56: 18,185,267 km (0.082 R)
- M57: 18,617,754 km (0.107 R)
- M58: 19,126,387 km (0.043 R)
- M59: 19,639,657 km (0.111 R)
- M60: 19,861,062 km (0.116 R)
- M61: 19,972,064 km (0.111 R)
- M62: 20,194,665 km (0.09 R)
- M63: 20,642,412 km (0.094 R)
- M64: 21,623,774 km (0.048 R)
- M65: 21,699,919 km (0.086 R)
- M66: 22,043,545 km (0.085 R)
- M67: 22,350,520 km (0.096 R)
- M68: 22,852,421 km (0.082 R)
- M69: 23,202,031 km (0.107 R)
- M70: 24,419,908 km (0.095 R)
- M71: 24,499,194 km (0.076 R)
- M72: 24,658,067 km (0.038 R)
- M73: 25,940,869 km (0.095 R)
- M74: 26,427,661 km (0.096 R)
- M75: 26,549,733 km (0.098 R)
- M76: 26,753,784 km (0.108 R)
Planet 3 - Gas Giant
Semi-Major Axis: 4.92 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 200.9
Radius: 14.8
Gravity: 0.92 G
Time & Orbit
Eccentricity (e): 0.215
Orbit Range: 3.86 AU - 5.98 AU
Year: 7402 Days
Day: 9 Hours
Environment
Temp: -230 °C
Axial Tilt: 22.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (48)
Outer Limit: 71,518,421 km
- M1: 311,912 km (0.114 R)
- M2: 473,328 km (0.054 R)
- M3: 747,690 km (0.101 R)
- M4: 1,286,691 km (0.107 R)
- M5: 2,193,105 km (0.049 R)
- M6: 3,535,596 km (0.068 R)
- M7: 3,956,265 km (0.1 R)
- M8: 5,268,538 km (0.103 R)
- M9: 5,680,082 km (0.08 R)
- M10: 6,729,959 km (0.086 R)
- M11: 7,530,906 km (0.118 R)
- M12: 7,787,467 km (0.053 R)
- M13: 8,047,019 km (0.031 R)
- M14: 8,256,606 km (0.092 R)
- M15: 8,362,222 km (0.075 R)
- M16: 8,896,585 km (0.097 R)
- M17: 9,442,169 km (0.034 R)
- M18: 9,608,073 km (0.101 R)
- M19: 9,802,700 km (0.078 R)
- M20: 10,366,235 km (0.065 R)
- M21: 10,480,228 km (0.088 R)
- M22: 10,853,475 km (0.065 R)
- M23: 11,027,308 km (0.102 R)
- M24: 11,791,155 km (0.078 R)
- M25: 12,029,614 km (0.089 R)
- M26: 12,360,225 km (0.089 R)
- M27: 12,815,900 km (0.11 R)
- M28: 13,030,423 km (0.079 R)
- M29: 13,900,485 km (0.055 R)
- M30: 14,247,402 km (0.095 R)
- M31: 14,406,125 km (0.112 R)
- M32: 15,467,971 km (0.104 R)
- M33: 16,123,958 km (0.084 R)
- M34: 16,855,940 km (0.075 R)
- M35: 17,124,917 km (0.116 R)
- M36: 17,598,843 km (0.112 R)
- M37: 18,077,257 km (0.075 R)
- M38: 18,352,517 km (0.082 R)
- M39: 18,872,370 km (0.1 R)
- M40: 19,256,836 km (0.115 R)
- M41: 19,820,521 km (0.11 R)
- M42: 20,712,124 km (0.056 R)
- M43: 21,507,686 km (0.081 R)
- M44: 21,616,892 km (0.069 R)
- M45: 23,577,522 km (0.091 R)
- M46: 23,953,910 km (0.054 R)
- M47: 24,218,399 km (0.111 R)
- M48: 24,903,258 km (0.068 R)
Planet 4 - Gas Giant
Semi-Major Axis: 5.09 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 137.9
Radius: 8.3
Gravity: 2 G
Time & Orbit
Eccentricity (e): 0.113
Orbit Range: 4.51 AU - 5.67 AU
Year: 7789 Days
Day: 8.7 Hours
Environment
Temp: -226 °C
Axial Tilt: 33.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (66)
Outer Limit: 71,518,421 km
- M1: 114,293 km (0.119 R)
- M2: 180,415 km (0.113 R)
- M3: 251,624 km (0.118 R)
- M4: 495,618 km (0.085 R)
- M5: 579,841 km (0.085 R)
- M6: 829,670 km (0.101 R)
- M7: 1,038,658 km (0.075 R)
- M8: 1,277,715 km (0.091 R)
- M9: 1,410,558 km (0.115 R)
- M10: 1,618,649 km (0.119 R)
- M11: 1,719,179 km (0.05 R)
- M12: 1,881,343 km (0.104 R)
- M13: 1,971,999 km (0.071 R)
- M14: 2,064,151 km (0.117 R)
- M15: 2,173,657 km (0.032 R)
- M16: 2,317,121 km (0.06 R)
- M17: 2,381,897 km (0.115 R)
- M18: 2,480,183 km (0.118 R)
- M19: 2,596,720 km (0.116 R)
- M20: 2,957,101 km (0.069 R)
- M21: 3,116,423 km (0.109 R)
- M22: 3,315,089 km (0.115 R)
- M23: 3,592,593 km (0.074 R)
- M24: 3,762,835 km (0.098 R)
- M25: 4,591,907 km (0.063 R)
- M26: 4,653,242 km (0.094 R)
- M27: 4,964,106 km (0.063 R)
- M28: 5,847,930 km (0.076 R)
- M29: 6,206,068 km (0.118 R)
- M30: 6,273,985 km (0.115 R)
- M31: 6,849,787 km (0.032 R)
- M32: 7,014,046 km (0.099 R)
- M33: 8,175,075 km (0.071 R)
- M34: 9,239,314 km (0.071 R)
- M35: 9,656,094 km (0.118 R)
- M36: 9,708,752 km (0.119 R)
- M37: 9,946,314 km (0.095 R)
- M38: 10,319,710 km (0.095 R)
- M39: 10,373,416 km (0.096 R)
- M40: 10,454,198 km (0.057 R)
- M41: 10,508,203 km (0.079 R)
- M42: 11,052,889 km (0.117 R)
- M43: 11,718,600 km (0.098 R)
- M44: 11,830,798 km (0.093 R)
- M45: 12,254,908 km (0.113 R)
- M46: 12,340,328 km (0.053 R)
- M47: 13,059,745 km (0.086 R)
- M48: 13,117,788 km (0.085 R)
- M49: 13,556,709 km (0.093 R)
- M50: 15,084,552 km (0.027 R)
- M51: 15,451,814 km (0.097 R)
- M52: 15,822,219 km (0.11 R)
- M53: 16,320,529 km (0.111 R)
- M54: 16,445,892 km (0.045 R)
- M55: 16,540,139 km (0.099 R)
- M56: 17,268,830 km (0.041 R)
- M57: 17,910,904 km (0.11 R)
- M58: 18,040,157 km (0.052 R)
- M59: 19,119,206 km (0.071 R)
- M60: 19,417,056 km (0.061 R)
- M61: 20,118,071 km (0.085 R)
- M62: 20,522,434 km (0.053 R)
- M63: 21,579,343 km (0.114 R)
- M64: 22,166,515 km (0.076 R)
- M65: 22,969,107 km (0.1 R)
- M66: 23,745,820 km (0.113 R)
Planet 5 - Ice Giant
Semi-Major Axis: 5.79 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 515.4
Radius: 5.8
Gravity: 15.32 G
Time & Orbit
Eccentricity (e): 0.07
Orbit Range: 5.38 AU - 6.2 AU
Year: 9450 Days
Day: 19.4 Hours
Environment
Temp: -228 °C
Axial Tilt: 25.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (97)
Outer Limit: 71,518,421 km
- M1: 78,988 km (0.11 R)
- M2: 218,263 km (0.048 R)
- M3: 279,150 km (0.11 R)
- M4: 382,522 km (0.106 R)
- M5: 612,753 km (0.09 R)
- M6: 703,559 km (0.061 R)
- M7: 967,599 km (0.098 R)
- M8: 1,020,407 km (0.068 R)
- M9: 1,203,664 km (0.062 R)
- M10: 1,538,913 km (0.106 R)
- M11: 1,879,996 km (0.086 R)
- M12: 1,946,567 km (0.111 R)
- M13: 2,555,730 km (0.091 R)
- M14: 3,009,610 km (0.043 R)
- M15: 3,114,029 km (0.104 R)
- M16: 3,272,603 km (0.113 R)
- M17: 3,653,180 km (0.119 R)
- M18: 4,105,265 km (0.046 R)
- M19: 4,192,032 km (0.068 R)
- M20: 4,485,543 km (0.041 R)
- M21: 4,785,636 km (0.059 R)
- M22: 5,061,345 km (0.117 R)
- M23: 5,310,724 km (0.118 R)
- M24: 5,692,498 km (0.118 R)
- M25: 6,515,735 km (0.086 R)
- M26: 7,340,768 km (0.085 R)
- M27: 7,980,747 km (0.103 R)
- M28: 8,417,423 km (0.103 R)
- M29: 8,675,779 km (0.104 R)
- M30: 8,861,729 km (0.026 R)
- M31: 8,899,129 km (0.079 R)
- M32: 10,515,833 km (0.086 R)
- M33: 10,555,327 km (0.098 R)
- M34: 10,793,935 km (0.05 R)
- M35: 11,561,073 km (0.099 R)
- M36: 13,062,138 km (0.078 R)
- M37: 13,104,624 km (0.103 R)
- M38: 13,792,026 km (0.105 R)
- M39: 14,140,140 km (0.065 R)
- M40: 15,112,078 km (0.048 R)
- M41: 15,291,146 km (0.1 R)
- M42: 15,380,905 km (0.12 R)
- M43: 15,606,199 km (0.1 R)
- M44: 16,748,678 km (0.112 R)
- M45: 16,887,655 km (0.112 R)
- M46: 17,447,001 km (0.114 R)
- M47: 17,493,975 km (0.12 R)
- M48: 17,823,390 km (0.115 R)
- M49: 18,107,476 km (0.06 R)
- M50: 19,210,012 km (0.112 R)
- M51: 19,452,510 km (0.077 R)
- M52: 19,696,056 km (0.117 R)
- M53: 19,989,716 km (0.086 R)
- M54: 20,730,076 km (0.115 R)
- M55: 20,779,743 km (0.098 R)
- M56: 21,228,686 km (0.101 R)
- M57: 22,492,339 km (0.095 R)
- M58: 23,004,562 km (0.099 R)
- M59: 23,365,392 km (0.088 R)
- M60: 23,572,436 km (0.087 R)
- M61: 23,988,318 km (0.113 R)
- M62: 25,038,794 km (0.083 R)
- M63: 25,144,709 km (0.116 R)
- M64: 25,783,043 km (0.058 R)
- M65: 27,293,084 km (0.088 R)
- M66: 27,784,513 km (0.108 R)
- M67: 27,948,921 km (0.105 R)
- M68: 28,058,726 km (0.105 R)
- M69: 28,278,785 km (0.106 R)
- M70: 28,444,240 km (0.108 R)
- M71: 28,998,051 km (0.103 R)
- M72: 29,164,853 km (0.088 R)
- M73: 29,835,351 km (0.082 R)
- M74: 30,172,544 km (0.061 R)
- M75: 30,793,974 km (0.116 R)
- M76: 30,850,671 km (0.052 R)
- M77: 31,419,592 km (0.034 R)
- M78: 31,590,882 km (0.098 R)
- M79: 32,856,928 km (0.073 R)
- M80: 32,914,823 km (0.116 R)
- M81: 33,088,805 km (0.095 R)
- M82: 33,321,430 km (0.112 R)
- M83: 34,022,146 km (0.115 R)
- M84: 34,080,789 km (0.088 R)
- M85: 34,198,073 km (0.049 R)
- M86: 34,433,241 km (0.027 R)
- M87: 35,260,218 km (0.061 R)
- M88: 36,512,951 km (0.091 R)
- M89: 38,144,914 km (0.107 R)
- M90: 38,388,758 km (0.108 R)
- M91: 38,939,129 km (0.061 R)
- M92: 39,553,827 km (0.069 R)
- M93: 39,738,879 km (0.112 R)
- M94: 40,047,799 km (0.054 R)
- M95: 40,481,782 km (0.08 R)
- M96: 40,917,262 km (0.118 R)
- M97: 41,354,387 km (0.105 R)
Planet 6 - Ice Giant
Semi-Major Axis: 8.37 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 843.5
Radius: 3.8
Gravity: 58.41 G
Time & Orbit
Eccentricity (e): 0.174
Orbit Range: 6.91 AU - 9.83 AU
Year: 16424 Days
Day: 24.8 Hours
Environment
Temp: -243 °C
Axial Tilt: 46.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (92)
Outer Limit: 71,518,421 km
- M1: 80,484 km (0.09 R)
- M2: 205,697 km (0.091 R)
- M3: 495,319 km (0.049 R)
- M4: 535,411 km (0.051 R)
- M5: 775,515 km (0.102 R)
- M6: 919,279 km (0.12 R)
- M7: 1,019,809 km (0.048 R)
- M8: 1,849,778 km (0.112 R)
- M9: 2,041,712 km (0.118 R)
- M10: 2,074,324 km (0.105 R)
- M11: 2,307,398 km (0.099 R)
- M12: 2,444,280 km (0.068 R)
- M13: 2,944,236 km (0.091 R)
- M14: 3,397,218 km (0.086 R)
- M15: 3,435,964 km (0.09 R)
- M16: 5,145,568 km (0.092 R)
- M17: 7,073,137 km (0.111 R)
- M18: 7,271,952 km (0.106 R)
- M19: 7,472,713 km (0.076 R)
- M20: 8,293,407 km (0.113 R)
- M21: 8,503,143 km (0.068 R)
- M22: 8,661,418 km (0.094 R)
- M23: 8,927,552 km (0.111 R)
- M24: 9,522,503 km (0.101 R)
- M25: 10,074,369 km (0.062 R)
- M26: 10,693,405 km (0.118 R)
- M27: 10,750,253 km (0.072 R)
- M28: 11,324,559 km (0.101 R)
- M29: 11,673,870 km (0.085 R)
- M30: 13,781,255 km (0.08 R)
- M31: 13,967,205 km (0.058 R)
- M32: 14,154,053 km (0.044 R)
- M33: 14,279,117 km (0.056 R)
- M34: 14,467,311 km (0.106 R)
- M35: 15,678,455 km (0.108 R)
- M36: 15,807,708 km (0.092 R)
- M37: 17,254,020 km (0.04 R)
- M38: 18,741,771 km (0.094 R)
- M39: 18,947,917 km (0.107 R)
- M40: 19,501,130 km (0.119 R)
- M41: 21,622,128 km (0.079 R)
- M42: 22,783,008 km (0.103 R)
- M43: 22,856,311 km (0.097 R)
- M44: 23,518,730 km (0.11 R)
- M45: 23,666,832 km (0.072 R)
- M46: 24,712,072 km (0.079 R)
- M47: 24,787,320 km (0.115 R)
- M48: 26,770,090 km (0.09 R)
- M49: 27,468,114 km (0.106 R)
- M50: 29,040,836 km (0.109 R)
- M51: 29,758,008 km (0.106 R)
- M52: 29,838,043 km (0.056 R)
- M53: 32,519,436 km (0.11 R)
- M54: 34,181,617 km (0.039 R)
- M55: 34,349,466 km (0.095 R)
- M56: 34,433,391 km (0.116 R)
- M57: 34,601,539 km (0.101 R)
- M58: 37,070,203 km (0.099 R)
- M59: 38,195,029 km (0.108 R)
- M60: 38,892,903 km (0.118 R)
- M61: 41,815,597 km (0.086 R)
- M62: 42,714,979 km (0.096 R)
- M63: 44,533,192 km (0.107 R)
- M64: 46,747,988 km (0.092 R)
- M65: 47,213,836 km (0.088 R)
- M66: 47,587,681 km (0.077 R)
- M67: 48,338,363 km (0.063 R)
- M68: 48,903,843 km (0.065 R)
- M69: 49,282,176 km (0.107 R)
- M70: 49,566,412 km (0.087 R)
- M71: 50,041,535 km (0.104 R)
- M72: 50,327,267 km (0.113 R)
- M73: 51,475,730 km (0.11 R)
- M74: 52,342,799 km (0.106 R)
- M75: 53,311,894 km (0.111 R)
- M76: 55,169,301 km (0.108 R)
- M77: 56,155,301 km (0.069 R)
- M78: 57,147,135 km (0.079 R)
- M79: 57,944,790 km (0.114 R)
- M80: 58,044,871 km (0.082 R)
- M81: 58,144,803 km (0.113 R)
- M82: 59,349,664 km (0.091 R)
- M83: 59,752,980 km (0.074 R)
- M84: 60,562,604 km (0.088 R)
- M85: 61,273,941 km (0.074 R)
- M86: 61,987,972 km (0.072 R)
- M87: 65,703,834 km (0.116 R)
- M88: 66,330,200 km (0.084 R)
- M89: 66,748,775 km (0.099 R)
- M90: 66,958,511 km (0.119 R)
- M91: 68,326,434 km (0.11 R)
- M92: 68,537,816 km (0.05 R)
Kuiper Belt
Range: 30 - 54 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 529 - 19,322 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.