Star System Generated (Seed: 1766912920)
Star Details
Spectral Class: M9V
Temperature: 2,400 K
Mass: 0.27 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: 10.4 AU
Planetary System (7 Planets)
Planet 1 - Gas Giant
Semi-Major Axis: 0.66 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 204.8
Radius: 13.7
Gravity: 1.09 G
Time & Orbit
Eccentricity (e): 0.052
Orbit Range: 0.63 AU - 0.69 AU
Year: 377 Days
Day: 14.4 Hours
Environment
Temp: -162 °C
Axial Tilt: 38.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (30)
Outer Limit: 37,663,291 km
- M1: 172,038 km (0.03 R)
- M2: 264,639 km (0.096 R)
- M3: 352,153 km (0.037 R)
- M4: 465,997 km (0.051 R)
- M5: 558,898 km (0.034 R)
- M6: 684,410 km (0.066 R)
- M7: 797,506 km (0.091 R)
- M8: 911,799 km (0.08 R)
- M9: 1,045,240 km (0.072 R)
- M10: 1,158,636 km (0.096 R)
- M11: 1,262,307 km (0.113 R)
- M12: 1,347,727 km (0.092 R)
- M13: 1,457,532 km (0.062 R)
- M14: 1,559,109 km (0.071 R)
- M15: 1,686,566 km (0.056 R)
- M16: 1,833,920 km (0.119 R)
- M17: 1,923,829 km (0.067 R)
- M18: 2,048,743 km (0.068 R)
- M19: 2,150,619 km (0.051 R)
- M20: 2,250,102 km (0.118 R)
- M21: 2,346,592 km (0.061 R)
- M22: 2,435,753 km (0.041 R)
- M23: 2,530,448 km (0.103 R)
- M24: 2,654,165 km (0.115 R)
- M25: 2,808,401 km (0.076 R)
- M26: 2,936,756 km (0.102 R)
- M27: 3,042,821 km (0.114 R)
- M28: 3,184,639 km (0.092 R)
- M29: 3,283,823 km (0.06 R)
- M30: 3,531,108 km (0.099 R)
Planet 2 - Gas Giant
Semi-Major Axis: 0.67 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 408.3
Radius: 14.5
Gravity: 1.94 G
Time & Orbit
Eccentricity (e): 0.019
Orbit Range: 0.66 AU - 0.68 AU
Year: 385 Days
Day: 10 Hours
Environment
Temp: -148 °C
Axial Tilt: 4.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (33)
Outer Limit: 37,663,291 km
- M1: 181,462 km (0.111 R)
- M2: 339,438 km (0.079 R)
- M3: 447,597 km (0.062 R)
- M4: 540,796 km (0.087 R)
- M5: 652,396 km (0.067 R)
- M6: 780,302 km (0.071 R)
- M7: 914,342 km (0.032 R)
- M8: 1,045,689 km (0.114 R)
- M9: 1,167,761 km (0.048 R)
- M10: 1,274,125 km (0.111 R)
- M11: 1,405,771 km (0.079 R)
- M12: 1,502,112 km (0.059 R)
- M13: 1,674,299 km (0.075 R)
- M14: 1,791,285 km (0.116 R)
- M15: 1,901,389 km (0.078 R)
- M16: 1,999,226 km (0.105 R)
- M17: 2,108,881 km (0.116 R)
- M18: 2,220,631 km (0.064 R)
- M19: 2,313,531 km (0.103 R)
- M20: 2,525,062 km (0.035 R)
- M21: 2,638,607 km (0.088 R)
- M22: 2,809,747 km (0.113 R)
- M23: 2,961,739 km (0.118 R)
- M24: 3,053,143 km (0.07 R)
- M25: 3,157,263 km (0.083 R)
- M26: 3,333,340 km (0.102 R)
- M27: 3,434,618 km (0.078 R)
- M28: 3,561,177 km (0.114 R)
- M29: 3,726,333 km (0.111 R)
- M30: 3,837,784 km (0.116 R)
- M31: 4,000,995 km (0.111 R)
- M32: 4,166,450 km (0.025 R)
- M33: 4,379,777 km (0.059 R)
Planet 3 - Gas Giant
Semi-Major Axis: 1.84 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 866.6
Radius: 8.3
Gravity: 12.58 G
Time & Orbit
Eccentricity (e): 0.082
Orbit Range: 1.69 AU - 1.99 AU
Year: 1754 Days
Day: 6.8 Hours
Environment
Temp: -196 °C
Axial Tilt: 33.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (74)
Outer Limit: 37,663,291 km
- M1: 135,835 km (0.071 R)
- M2: 204,500 km (0.073 R)
- M3: 273,016 km (0.111 R)
- M4: 364,570 km (0.077 R)
- M5: 489,185 km (0.119 R)
- M6: 668,254 km (0.068 R)
- M7: 740,958 km (0.12 R)
- M8: 816,655 km (0.084 R)
- M9: 886,218 km (0.108 R)
- M10: 1,022,352 km (0.102 R)
- M11: 1,078,900 km (0.027 R)
- M12: 1,493,286 km (0.103 R)
- M13: 1,645,726 km (0.098 R)
- M14: 1,803,253 km (0.099 R)
- M15: 2,013,139 km (0.077 R)
- M16: 2,133,266 km (0.107 R)
- M17: 2,318,019 km (0.09 R)
- M18: 2,456,696 km (0.073 R)
- M19: 2,559,470 km (0.051 R)
- M20: 2,876,169 km (0.12 R)
- M21: 2,970,864 km (0.083 R)
- M22: 3,765,977 km (0.056 R)
- M23: 3,854,988 km (0.034 R)
- M24: 4,233,321 km (0.079 R)
- M25: 4,310,363 km (0.039 R)
- M26: 4,403,563 km (0.101 R)
- M27: 4,623,472 km (0.045 R)
- M28: 5,074,210 km (0.105 R)
- M29: 5,222,162 km (0.074 R)
- M30: 5,304,890 km (0.043 R)
- M31: 5,421,576 km (0.078 R)
- M32: 5,539,011 km (0.054 R)
- M33: 5,674,397 km (0.12 R)
- M34: 5,793,776 km (0.097 R)
- M35: 5,896,699 km (0.094 R)
- M36: 5,982,868 km (0.108 R)
- M37: 6,104,341 km (0.099 R)
- M38: 6,174,203 km (0.106 R)
- M39: 6,226,712 km (0.115 R)
- M40: 6,296,874 km (0.052 R)
- M41: 6,652,169 km (0.084 R)
- M42: 6,741,927 km (0.117 R)
- M43: 6,904,690 km (0.114 R)
- M44: 6,995,645 km (0.089 R)
- M45: 7,050,398 km (0.067 R)
- M46: 7,197,154 km (0.086 R)
- M47: 7,344,956 km (0.119 R)
- M48: 7,475,106 km (0.083 R)
- M49: 8,079,781 km (0.09 R)
- M50: 8,310,611 km (0.104 R)
- M51: 8,524,236 km (0.081 R)
- M52: 8,680,566 km (0.107 R)
- M53: 8,759,105 km (0.08 R)
- M54: 9,335,954 km (0.1 R)
- M55: 9,456,680 km (0.119 R)
- M56: 9,761,261 km (0.045 R)
- M57: 9,883,931 km (0.087 R)
- M58: 10,484,118 km (0.114 R)
- M59: 10,567,743 km (0.105 R)
- M60: 11,032,245 km (0.099 R)
- M61: 11,503,328 km (0.116 R)
- M62: 12,487,383 km (0.12 R)
- M63: 13,068,122 km (0.114 R)
- M64: 13,339,193 km (0.059 R)
- M65: 13,657,687 km (0.077 R)
- M66: 13,817,907 km (0.12 R)
- M67: 13,886,871 km (0.099 R)
- M68: 14,186,516 km (0.113 R)
- M69: 14,488,404 km (0.089 R)
- M70: 14,815,874 km (0.083 R)
- M71: 15,216,796 km (0.039 R)
- M72: 15,382,850 km (0.113 R)
- M73: 15,957,006 km (0.044 R)
- M74: 16,246,778 km (0.096 R)
Planet 4 - Gas Giant
Semi-Major Axis: 2.34 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 930.8
Radius: 14.7
Gravity: 4.31 G
Time & Orbit
Eccentricity (e): 0.102
Orbit Range: 2.1 AU - 2.58 AU
Year: 2516 Days
Day: 9.9 Hours
Environment
Temp: -204 °C
Axial Tilt: 44.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (68)
Outer Limit: 37,663,291 km
- M1: 190,288 km (0.102 R)
- M2: 338,241 km (0.108 R)
- M3: 758,611 km (0.119 R)
- M4: 1,166,115 km (0.111 R)
- M5: 1,293,423 km (0.032 R)
- M6: 1,576,014 km (0.092 R)
- M7: 1,679,236 km (0.08 R)
- M8: 1,824,944 km (0.068 R)
- M9: 2,259,526 km (0.057 R)
- M10: 2,406,731 km (0.099 R)
- M11: 2,587,744 km (0.061 R)
- M12: 2,695,604 km (0.117 R)
- M13: 2,789,252 km (0.118 R)
- M14: 2,979,840 km (0.098 R)
- M15: 3,142,154 km (0.101 R)
- M16: 3,526,770 km (0.111 R)
- M17: 3,646,897 km (0.028 R)
- M18: 4,213,723 km (0.062 R)
- M19: 4,323,229 km (0.062 R)
- M20: 4,563,633 km (0.033 R)
- M21: 4,789,525 km (0.114 R)
- M22: 4,884,819 km (0.078 R)
- M23: 5,077,202 km (0.088 R)
- M24: 5,174,441 km (0.103 R)
- M25: 5,469,747 km (0.117 R)
- M26: 5,750,393 km (0.057 R)
- M27: 5,933,351 km (0.077 R)
- M28: 6,077,114 km (0.092 R)
- M29: 6,263,513 km (0.094 R)
- M30: 6,791,444 km (0.115 R)
- M31: 7,006,715 km (0.117 R)
- M32: 7,399,859 km (0.081 R)
- M33: 7,710,723 km (0.086 R)
- M34: 8,391,543 km (0.099 R)
- M35: 8,646,009 km (0.035 R)
- M36: 8,949,992 km (0.096 R)
- M37: 9,186,356 km (0.03 R)
- M38: 9,305,287 km (0.077 R)
- M39: 9,400,730 km (0.085 R)
- M40: 9,496,622 km (0.112 R)
- M41: 9,931,952 km (0.069 R)
- M42: 10,176,694 km (0.102 R)
- M43: 10,722,278 km (0.067 R)
- M44: 11,150,277 km (0.111 R)
- M45: 11,302,718 km (0.104 R)
- M46: 11,507,068 km (0.093 R)
- M47: 11,609,692 km (0.075 R)
- M48: 11,738,496 km (0.117 R)
- M49: 12,049,360 km (0.096 R)
- M50: 12,547,222 km (0.111 R)
- M51: 12,652,988 km (0.093 R)
- M52: 12,865,267 km (0.097 R)
- M53: 13,185,856 km (0.109 R)
- M54: 13,454,982 km (0.102 R)
- M55: 14,163,478 km (0.108 R)
- M56: 14,550,039 km (0.119 R)
- M57: 14,856,265 km (0.088 R)
- M58: 15,361,906 km (0.08 R)
- M59: 16,073,543 km (0.118 R)
- M60: 16,505,731 km (0.119 R)
- M61: 16,941,809 km (0.099 R)
- M62: 18,512,736 km (0.066 R)
- M63: 18,814,326 km (0.082 R)
- M64: 19,544,962 km (0.066 R)
- M65: 19,975,504 km (0.073 R)
- M66: 20,440,155 km (0.086 R)
- M67: 20,533,654 km (0.043 R)
- M68: 20,658,269 km (0.064 R)
Planet 5 - Gas Giant
Semi-Major Axis: 2.8 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 905.8
Radius: 14
Gravity: 4.62 G
Time & Orbit
Eccentricity (e): 0.134
Orbit Range: 2.42 AU - 3.18 AU
Year: 3293 Days
Day: 12.8 Hours
Environment
Temp: -209 °C
Axial Tilt: 21.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (73)
Outer Limit: 37,663,291 km
- M1: 239,357 km (0.113 R)
- M2: 373,396 km (0.115 R)
- M3: 495,468 km (0.104 R)
- M4: 655,538 km (0.102 R)
- M5: 759,209 km (0.111 R)
- M6: 869,463 km (0.104 R)
- M7: 1,108,071 km (0.04 R)
- M8: 1,235,828 km (0.117 R)
- M9: 1,679,834 km (0.094 R)
- M10: 1,798,765 km (0.104 R)
- M11: 1,920,537 km (0.113 R)
- M12: 2,319,665 km (0.101 R)
- M13: 2,419,446 km (0.051 R)
- M14: 2,658,055 km (0.106 R)
- M15: 2,886,790 km (0.068 R)
- M16: 3,012,602 km (0.084 R)
- M17: 3,195,710 km (0.102 R)
- M18: 3,477,403 km (0.118 R)
- M19: 3,846,012 km (0.043 R)
- M20: 3,945,195 km (0.053 R)
- M21: 4,391,745 km (0.118 R)
- M22: 4,579,191 km (0.092 R)
- M23: 5,223,210 km (0.093 R)
- M24: 5,377,744 km (0.04 R)
- M25: 5,827,435 km (0.094 R)
- M26: 6,103,144 km (0.072 R)
- M27: 6,359,705 km (0.114 R)
- M28: 6,501,224 km (0.118 R)
- M29: 6,859,511 km (0.09 R)
- M30: 7,620,516 km (0.073 R)
- M31: 7,897,122 km (0.111 R)
- M32: 8,851,556 km (0.112 R)
- M33: 9,897,096 km (0.105 R)
- M34: 10,671,714 km (0.026 R)
- M35: 11,494,652 km (0.108 R)
- M36: 11,638,565 km (0.059 R)
- M37: 11,841,270 km (0.084 R)
- M38: 13,716,629 km (0.063 R)
- M39: 14,641,892 km (0.111 R)
- M40: 14,766,806 km (0.098 R)
- M41: 15,364,898 km (0.058 R)
- M42: 15,460,042 km (0.049 R)
- M43: 15,778,686 km (0.074 R)
- M44: 16,228,527 km (0.092 R)
- M45: 16,325,466 km (0.079 R)
- M46: 16,943,904 km (0.109 R)
- M47: 17,140,774 km (0.095 R)
- M48: 18,338,156 km (0.108 R)
- M49: 18,675,649 km (0.083 R)
- M50: 18,913,060 km (0.068 R)
- M51: 19,151,519 km (0.094 R)
- M52: 19,322,360 km (0.105 R)
- M53: 19,425,134 km (0.082 R)
- M54: 19,631,280 km (0.068 R)
- M55: 19,872,731 km (0.1 R)
- M56: 20,288,912 km (0.108 R)
- M57: 20,463,194 km (0.095 R)
- M58: 20,672,930 km (0.11 R)
- M59: 20,848,258 km (0.113 R)
- M60: 20,988,880 km (0.096 R)
- M61: 21,129,802 km (0.118 R)
- M62: 21,519,205 km (0.081 R)
- M63: 21,625,719 km (0.116 R)
- M64: 22,340,796 km (0.074 R)
- M65: 22,773,433 km (0.073 R)
- M66: 22,990,949 km (0.112 R)
- M67: 23,172,561 km (0.057 R)
- M68: 23,574,081 km (0.113 R)
- M69: 23,830,791 km (0.089 R)
- M70: 24,014,647 km (0.105 R)
- M71: 24,420,955 km (0.117 R)
- M72: 24,532,106 km (0.112 R)
- M73: 24,717,757 km (0.093 R)
Planet 6 - Gas Giant
Semi-Major Axis: 5.35 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 76.4
Radius: 8.1
Gravity: 1.16 G
Time & Orbit
Eccentricity (e): 0.128
Orbit Range: 4.67 AU - 6.03 AU
Year: 8698 Days
Day: 10.8 Hours
Environment
Temp: -226 °C
Axial Tilt: 46 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (45)
Outer Limit: 37,663,291 km
- M1: 101,427 km (0.09 R)
- M2: 378,034 km (0.093 R)
- M3: 723,156 km (0.115 R)
- M4: 822,788 km (0.113 R)
- M5: 1,365,230 km (0.078 R)
- M6: 1,645,726 km (0.08 R)
- M7: 2,128,778 km (0.083 R)
- M8: 2,201,183 km (0.097 R)
- M9: 2,259,825 km (0.051 R)
- M10: 2,408,675 km (0.106 R)
- M11: 2,484,372 km (0.112 R)
- M12: 2,576,225 km (0.066 R)
- M13: 2,890,680 km (0.068 R)
- M14: 3,317,782 km (0.091 R)
- M15: 3,453,317 km (0.073 R)
- M16: 4,359,282 km (0.117 R)
- M17: 4,414,783 km (0.112 R)
- M18: 4,809,871 km (0.073 R)
- M19: 5,079,745 km (0.045 R)
- M20: 5,980,025 km (0.092 R)
- M21: 6,586,196 km (0.116 R)
- M22: 7,721,494 km (0.033 R)
- M23: 8,449,886 km (0.098 R)
- M24: 8,635,387 km (0.067 R)
- M25: 8,939,819 km (0.046 R)
- M26: 9,271,478 km (0.095 R)
- M27: 10,290,838 km (0.096 R)
- M28: 10,964,776 km (0.115 R)
- M29: 11,268,908 km (0.028 R)
- M30: 11,601,464 km (0.103 R)
- M31: 12,328,809 km (0.095 R)
- M32: 13,204,854 km (0.103 R)
- M33: 14,625,735 km (0.107 R)
- M34: 15,185,081 km (0.11 R)
- M35: 16,065,764 km (0.078 R)
- M36: 16,295,846 km (0.101 R)
- M37: 16,411,186 km (0.117 R)
- M38: 16,933,881 km (0.109 R)
- M39: 17,757,866 km (0.078 R)
- M40: 19,261,324 km (0.105 R)
- M41: 19,505,618 km (0.117 R)
- M42: 20,028,313 km (0.093 R)
- M43: 20,151,880 km (0.074 R)
- M44: 20,306,864 km (0.051 R)
- M45: 20,400,063 km (0.099 R)
Planet 7 - Ice Giant
Semi-Major Axis: 7.18 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 181.7
Radius: 4.8
Gravity: 7.89 G
Time & Orbit
Eccentricity (e): 0.056
Orbit Range: 6.78 AU - 7.58 AU
Year: 13524 Days
Day: 25 Hours
Environment
Temp: -227 °C
Axial Tilt: 11.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (92)
Outer Limit: 37,663,291 km
- M1: 91,853 km (0.12 R)
- M2: 128,804 km (0.069 R)
- M3: 199,564 km (0.056 R)
- M4: 255,064 km (0.111 R)
- M5: 338,241 km (0.053 R)
- M6: 371,900 km (0.084 R)
- M7: 668,553 km (0.108 R)
- M8: 991,535 km (0.083 R)
- M9: 1,058,106 km (0.06 R)
- M10: 1,091,915 km (0.1 R)
- M11: 1,160,730 km (0.053 R)
- M12: 1,231,041 km (0.117 R)
- M13: 1,469,201 km (0.116 R)
- M14: 2,071,781 km (0.091 R)
- M15: 2,488,860 km (0.102 R)
- M16: 2,695,454 km (0.084 R)
- M17: 3,124,950 km (0.077 R)
- M18: 3,198,552 km (0.105 R)
- M19: 3,397,816 km (0.027 R)
- M20: 3,678,462 km (0.053 R)
- M21: 3,730,223 km (0.097 R)
- M22: 4,703,806 km (0.086 R)
- M23: 4,873,450 km (0.063 R)
- M24: 5,364,729 km (0.101 R)
- M25: 5,781,060 km (0.103 R)
- M26: 5,962,672 km (0.118 R)
- M27: 7,123,551 km (0.11 R)
- M28: 7,481,838 km (0.118 R)
- M29: 7,879,320 km (0.055 R)
- M30: 8,047,019 km (0.116 R)
- M31: 8,114,488 km (0.118 R)
- M32: 8,283,832 km (0.117 R)
- M33: 9,042,742 km (0.047 R)
- M34: 9,430,351 km (0.095 R)
- M35: 9,465,955 km (0.1 R)
- M36: 10,076,464 km (0.113 R)
- M37: 10,295,026 km (0.113 R)
- M38: 12,486,785 km (0.104 R)
- M39: 13,314,659 km (0.067 R)
- M40: 14,486,908 km (0.043 R)
- M41: 14,610,027 km (0.074 R)
- M42: 14,816,024 km (0.105 R)
- M43: 14,981,479 km (0.063 R)
- M44: 15,397,810 km (0.109 R)
- M45: 16,412,682 km (0.088 R)
- M46: 16,455,467 km (0.117 R)
- M47: 18,417,293 km (0.075 R)
- M48: 18,461,724 km (0.118 R)
- M49: 18,729,055 km (0.067 R)
- M50: 18,907,974 km (0.075 R)
- M51: 19,087,492 km (0.084 R)
- M52: 19,177,549 km (0.069 R)
- M53: 19,538,828 km (0.087 R)
- M54: 20,682,205 km (0.118 R)
- M55: 21,518,756 km (0.109 R)
- M56: 22,082,740 km (0.11 R)
- M57: 22,413,800 km (0.031 R)
- M58: 22,699,083 km (0.094 R)
- M59: 22,889,821 km (0.082 R)
- M60: 23,177,049 km (0.085 R)
- M61: 23,609,985 km (0.119 R)
- M62: 24,240,091 km (0.032 R)
- M63: 24,435,167 km (0.034 R)
- M64: 24,826,664 km (0.113 R)
- M65: 25,171,039 km (0.119 R)
- M66: 26,313,517 km (0.093 R)
- M67: 26,815,418 km (0.112 R)
- M68: 26,916,247 km (0.097 R)
- M69: 27,067,640 km (0.113 R)
- M70: 27,168,619 km (0.12 R)
- M71: 27,422,038 km (0.11 R)
- M72: 27,574,328 km (0.104 R)
- M73: 28,494,206 km (0.108 R)
- M74: 29,009,720 km (0.103 R)
- M75: 29,424,256 km (0.101 R)
- M76: 29,528,226 km (0.038 R)
- M77: 29,684,257 km (0.07 R)
- M78: 29,788,526 km (0.055 R)
- M79: 29,892,946 km (0.098 R)
- M80: 30,154,443 km (0.082 R)
- M81: 30,259,161 km (0.107 R)
- M82: 30,416,688 km (0.033 R)
- M83: 31,685,876 km (0.12 R)
- M84: 32,059,272 km (0.067 R)
- M85: 32,112,679 km (0.119 R)
- M86: 32,756,548 km (0.113 R)
- M87: 33,188,288 km (0.107 R)
- M88: 33,404,756 km (0.119 R)
- M89: 33,459,060 km (0.071 R)
- M90: 34,878,594 km (0.087 R)
- M91: 36,317,725 km (0.099 R)
- M92: 37,381,666 km (0.103 R)
Kuiper Belt
Range: 30 - 49 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 293 - 15,270 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.