Star System Generated (Seed: 1768405269)
Star Details
Spectral Class: M8V
Temperature: 2,617 K
Mass: 0.28 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: 10.6 AU
Planetary System (6 Planets)
Planet 1 - Gas Giant
Semi-Major Axis: 1.02 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 984.3
Radius: 14.3
Gravity: 4.81 G
Time & Orbit
Eccentricity (e): 0.154
Orbit Range: 0.86 AU - 1.18 AU
Year: 711 Days
Day: 7.4 Hours
Environment
Temp: -186 °C
Axial Tilt: 17.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (51)
Outer Limit: 88,185,555 km
- M1: 178,171 km (0.099 R)
- M2: 273,615 km (0.074 R)
- M3: 372,349 km (0.072 R)
- M4: 514,617 km (0.084 R)
- M5: 654,790 km (0.097 R)
- M6: 771,626 km (0.099 R)
- M7: 1,010,683 km (0.097 R)
- M8: 1,104,631 km (0.047 R)
- M9: 1,215,184 km (0.075 R)
- M10: 1,309,281 km (0.052 R)
- M11: 1,399,039 km (0.037 R)
- M12: 1,526,945 km (0.109 R)
- M13: 1,689,110 km (0.049 R)
- M14: 1,857,108 km (0.067 R)
- M15: 2,087,638 km (0.047 R)
- M16: 2,185,774 km (0.083 R)
- M17: 2,302,461 km (0.095 R)
- M18: 2,585,949 km (0.12 R)
- M19: 2,763,372 km (0.079 R)
- M20: 3,187,183 km (0.117 R)
- M21: 3,301,176 km (0.069 R)
- M22: 3,455,412 km (0.089 R)
- M23: 3,681,304 km (0.068 R)
- M24: 3,791,259 km (0.092 R)
- M25: 3,932,629 km (0.118 R)
- M26: 4,106,761 km (0.041 R)
- M27: 4,210,432 km (0.07 R)
- M28: 4,346,566 km (0.118 R)
- M29: 4,516,061 km (0.069 R)
- M30: 4,774,566 km (0.06 R)
- M31: 4,916,684 km (0.088 R)
- M32: 5,071,368 km (0.075 R)
- M33: 5,340,345 km (0.113 R)
- M34: 5,533,625 km (0.054 R)
- M35: 5,648,516 km (0.119 R)
- M36: 5,904,030 km (0.111 R)
- M37: 5,997,827 km (0.072 R)
- M38: 6,234,790 km (0.071 R)
- M39: 6,330,383 km (0.117 R)
- M40: 6,523,215 km (0.094 R)
- M41: 6,705,725 km (0.101 R)
- M42: 6,828,245 km (0.1 R)
- M43: 7,088,246 km (0.117 R)
- M44: 7,250,859 km (0.086 R)
- M45: 7,427,385 km (0.091 R)
- M46: 7,592,541 km (0.078 R)
- M47: 7,784,624 km (0.106 R)
- M48: 7,939,608 km (0.094 R)
- M49: 8,318,240 km (0.117 R)
- M50: 8,796,355 km (0.075 R)
- M51: 8,998,312 km (0.072 R)
Planet 2 - Gas Giant
Semi-Major Axis: 1.15 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 634.8
Radius: 8.9
Gravity: 8.01 G
Time & Orbit
Eccentricity (e): 0.098
Orbit Range: 1.04 AU - 1.26 AU
Year: 851 Days
Day: 10.8 Hours
Environment
Temp: -175 °C
Axial Tilt: 25.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (59)
Outer Limit: 88,185,555 km
- M1: 122,371 km (0.089 R)
- M2: 198,816 km (0.046 R)
- M3: 258,655 km (0.078 R)
- M4: 355,893 km (0.117 R)
- M5: 432,188 km (0.115 R)
- M6: 514,916 km (0.085 R)
- M7: 603,927 km (0.12 R)
- M8: 720,314 km (0.078 R)
- M9: 809,923 km (0.065 R)
- M10: 885,769 km (0.092 R)
- M11: 1,038,658 km (0.07 R)
- M12: 1,227,301 km (0.071 R)
- M13: 1,322,296 km (0.083 R)
- M14: 1,427,014 km (0.114 R)
- M15: 1,549,236 km (0.043 R)
- M16: 1,850,376 km (0.114 R)
- M17: 2,104,842 km (0.069 R)
- M18: 2,211,356 km (0.103 R)
- M19: 2,277,927 km (0.071 R)
- M20: 2,744,523 km (0.109 R)
- M21: 2,888,436 km (0.042 R)
- M22: 3,118,368 km (0.111 R)
- M23: 3,231,015 km (0.083 R)
- M24: 3,373,582 km (0.106 R)
- M25: 3,498,945 km (0.071 R)
- M26: 3,606,206 km (0.08 R)
- M27: 3,704,642 km (0.067 R)
- M28: 3,914,378 km (0.113 R)
- M29: 3,974,965 km (0.115 R)
- M30: 4,138,176 km (0.114 R)
- M31: 4,282,837 km (0.077 R)
- M32: 4,460,859 km (0.061 R)
- M33: 4,759,307 km (0.117 R)
- M34: 4,976,523 km (0.066 R)
- M35: 5,174,890 km (0.103 R)
- M36: 5,252,680 km (0.089 R)
- M37: 5,465,857 km (0.1 R)
- M38: 5,533,775 km (0.048 R)
- M39: 5,889,369 km (0.108 R)
- M40: 6,040,612 km (0.112 R)
- M41: 6,264,112 km (0.093 R)
- M42: 6,418,497 km (0.085 R)
- M43: 6,901,847 km (0.084 R)
- M44: 7,012,101 km (0.077 R)
- M45: 7,371,734 km (0.114 R)
- M46: 7,446,832 km (0.103 R)
- M47: 7,534,946 km (0.105 R)
- M48: 7,623,208 km (0.117 R)
- M49: 7,686,638 km (0.085 R)
- M50: 7,801,080 km (0.095 R)
- M51: 7,903,256 km (0.054 R)
- M52: 7,980,149 km (0.049 R)
- M53: 8,057,341 km (0.046 R)
- M54: 8,121,818 km (0.103 R)
- M55: 8,186,594 km (0.112 R)
- M56: 8,342,475 km (0.114 R)
- M57: 8,565,226 km (0.057 R)
- M58: 8,631,049 km (0.081 R)
- M59: 8,789,772 km (0.094 R)
Planet 3 - Gas Giant
Semi-Major Axis: 1.72 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 951
Radius: 11.4
Gravity: 7.32 G
Time & Orbit
Eccentricity (e): 0.141
Orbit Range: 1.48 AU - 1.96 AU
Year: 1557 Days
Day: 13 Hours
Environment
Temp: -200 °C
Axial Tilt: 1.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (68)
Outer Limit: 88,185,555 km
- M1: 143,165 km (0.12 R)
- M2: 242,199 km (0.093 R)
- M3: 339,587 km (0.103 R)
- M4: 569,669 km (0.087 R)
- M5: 724,203 km (0.106 R)
- M6: 1,032,674 km (0.088 R)
- M7: 1,114,055 km (0.034 R)
- M8: 1,352,066 km (0.105 R)
- M9: 1,544,299 km (0.085 R)
- M10: 1,745,807 km (0.113 R)
- M11: 2,128,030 km (0.081 R)
- M12: 2,341,057 km (0.079 R)
- M13: 2,524,165 km (0.049 R)
- M14: 2,623,797 km (0.114 R)
- M15: 3,009,161 km (0.105 R)
- M16: 3,276,193 km (0.072 R)
- M17: 3,399,013 km (0.085 R)
- M18: 3,551,154 km (0.097 R)
- M19: 3,748,025 km (0.075 R)
- M20: 3,948,636 km (0.117 R)
- M21: 4,064,873 km (0.096 R)
- M22: 4,167,497 km (0.114 R)
- M23: 4,285,979 km (0.107 R)
- M24: 4,390,398 km (0.116 R)
- M25: 4,617,338 km (0.089 R)
- M26: 4,724,600 km (0.076 R)
- M27: 4,801,643 km (0.107 R)
- M28: 4,894,842 km (0.081 R)
- M29: 5,082,737 km (0.098 R)
- M30: 5,241,311 km (0.118 R)
- M31: 5,595,858 km (0.079 R)
- M32: 5,875,307 km (0.1 R)
- M33: 6,142,489 km (0.119 R)
- M34: 6,243,617 km (0.11 R)
- M35: 6,499,130 km (0.104 R)
- M36: 6,758,233 km (0.05 R)
- M37: 6,845,299 km (0.082 R)
- M38: 6,967,820 km (0.073 R)
- M39: 7,447,580 km (0.108 R)
- M40: 7,519,537 km (0.113 R)
- M41: 7,736,753 km (0.092 R)
- M42: 7,846,259 km (0.09 R)
- M43: 8,233,418 km (0.086 R)
- M44: 8,307,918 km (0.085 R)
- M45: 8,420,116 km (0.063 R)
- M46: 8,608,011 km (0.079 R)
- M47: 8,721,556 km (0.115 R)
- M48: 8,892,696 km (0.087 R)
- M49: 8,969,140 km (0.066 R)
- M50: 9,064,883 km (0.057 R)
- M51: 9,335,057 km (0.069 R)
- M52: 10,161,585 km (0.053 R)
- M53: 10,261,666 km (0.09 R)
- M54: 10,563,405 km (0.113 R)
- M55: 10,746,064 km (0.074 R)
- M56: 11,155,364 km (0.12 R)
- M57: 11,362,108 km (0.082 R)
- M58: 11,486,573 km (0.105 R)
- M59: 11,989,521 km (0.086 R)
- M60: 12,222,445 km (0.115 R)
- M61: 12,649,846 km (0.072 R)
- M62: 13,038,651 km (0.085 R)
- M63: 13,212,783 km (0.117 R)
- M64: 13,585,282 km (0.064 R)
- M65: 13,717,526 km (0.086 R)
- M66: 14,655,655 km (0.112 R)
- M67: 15,292,642 km (0.095 R)
- M68: 15,384,346 km (0.119 R)
Planet 4 - Gas Giant
Semi-Major Axis: 3.78 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 905.5
Radius: 11.4
Gravity: 6.97 G
Time & Orbit
Eccentricity (e): 0.206
Orbit Range: 3 AU - 4.56 AU
Year: 5073 Days
Day: 14.7 Hours
Environment
Temp: -223 °C
Axial Tilt: 45.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (79)
Outer Limit: 88,185,555 km
- M1: 273,465 km (0.074 R)
- M2: 525,537 km (0.111 R)
- M3: 619,335 km (0.086 R)
- M4: 706,700 km (0.05 R)
- M5: 799,002 km (0.064 R)
- M6: 1,132,755 km (0.073 R)
- M7: 1,390,662 km (0.117 R)
- M8: 1,614,311 km (0.112 R)
- M9: 1,721,572 km (0.057 R)
- M10: 1,905,877 km (0.068 R)
- M11: 2,581,012 km (0.118 R)
- M12: 2,792,992 km (0.079 R)
- M13: 2,944,834 km (0.117 R)
- M14: 3,055,088 km (0.099 R)
- M15: 3,509,865 km (0.104 R)
- M16: 3,769,118 km (0.026 R)
- M17: 4,034,804 km (0.111 R)
- M18: 4,661,320 km (0.099 R)
- M19: 5,157,835 km (0.074 R)
- M20: 5,534,672 km (0.078 R)
- M21: 5,616,652 km (0.083 R)
- M22: 6,032,235 km (0.1 R)
- M23: 6,201,430 km (0.112 R)
- M24: 6,631,075 km (0.092 R)
- M25: 7,011,353 km (0.096 R)
- M26: 7,278,684 km (0.036 R)
- M27: 7,489,019 km (0.095 R)
- M28: 7,977,456 km (0.095 R)
- M29: 8,697,620 km (0.059 R)
- M30: 9,113,801 km (0.091 R)
- M31: 9,243,204 km (0.105 R)
- M32: 9,405,817 km (0.087 R)
- M33: 9,503,953 km (0.117 R)
- M34: 9,668,062 km (0.106 R)
- M35: 9,833,068 km (0.114 R)
- M36: 10,638,653 km (0.069 R)
- M37: 10,946,226 km (0.108 R)
- M38: 11,500,187 km (0.038 R)
- M39: 11,640,061 km (0.046 R)
- M40: 12,169,936 km (0.12 R)
- M41: 12,419,914 km (0.118 R)
- M42: 12,527,625 km (0.063 R)
- M43: 13,436,731 km (0.084 R)
- M44: 13,732,187 km (0.118 R)
- M45: 14,707,116 km (0.078 R)
- M46: 14,935,253 km (0.106 R)
- M47: 15,164,736 km (0.11 R)
- M48: 16,171,979 km (0.08 R)
- M49: 16,289,712 km (0.086 R)
- M50: 16,882,120 km (0.054 R)
- M51: 17,160,970 km (0.102 R)
- M52: 17,481,558 km (0.063 R)
- M53: 18,047,487 km (0.079 R)
- M54: 18,496,281 km (0.095 R)
- M55: 18,948,814 km (0.071 R)
- M56: 19,197,147 km (0.108 R)
- M57: 19,780,878 km (0.108 R)
- M58: 20,201,397 km (0.111 R)
- M59: 20,582,423 km (0.058 R)
- M60: 20,795,151 km (0.114 R)
- M61: 21,222,702 km (0.108 R)
- M62: 23,050,190 km (0.096 R)
- M63: 23,182,584 km (0.101 R)
- M64: 23,893,323 km (0.052 R)
- M65: 24,027,363 km (0.086 R)
- M66: 24,521,185 km (0.073 R)
- M67: 24,701,451 km (0.12 R)
- M68: 25,564,182 km (0.111 R)
- M69: 25,838,694 km (0.079 R)
- M70: 26,621,839 km (0.039 R)
- M71: 26,714,440 km (0.049 R)
- M72: 28,211,316 km (0.094 R)
- M73: 28,352,985 km (0.094 R)
- M74: 29,303,979 km (0.096 R)
- M75: 31,139,395 km (0.077 R)
- M76: 31,285,851 km (0.107 R)
- M77: 31,481,526 km (0.095 R)
- M78: 31,874,070 km (0.115 R)
- M79: 32,070,941 km (0.081 R)
Planet 5 - Gas Giant
Semi-Major Axis: 4.89 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 132.6
Radius: 9.3
Gravity: 1.53 G
Time & Orbit
Eccentricity (e): 0.065
Orbit Range: 4.57 AU - 5.21 AU
Year: 7464 Days
Day: 8 Hours
Environment
Temp: -231 °C
Axial Tilt: 34.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (78)
Outer Limit: 88,185,555 km
- M1: 117,734 km (0.077 R)
- M2: 189,690 km (0.089 R)
- M3: 304,132 km (0.108 R)
- M4: 392,694 km (0.09 R)
- M5: 572,661 km (0.095 R)
- M6: 790,924 km (0.058 R)
- M7: 866,022 km (0.059 R)
- M8: 1,024,147 km (0.025 R)
- M9: 1,082,939 km (0.107 R)
- M10: 1,155,195 km (0.108 R)
- M11: 1,330,374 km (0.079 R)
- M12: 1,421,180 km (0.071 R)
- M13: 1,527,843 km (0.119 R)
- M14: 2,100,504 km (0.102 R)
- M15: 2,191,908 km (0.093 R)
- M16: 2,331,483 km (0.05 R)
- M17: 2,554,533 km (0.066 R)
- M18: 2,701,588 km (0.109 R)
- M19: 2,784,615 km (0.061 R)
- M20: 3,142,453 km (0.094 R)
- M21: 3,247,471 km (0.119 R)
- M22: 3,353,685 km (0.084 R)
- M23: 3,442,995 km (0.105 R)
- M24: 3,533,203 km (0.098 R)
- M25: 3,920,511 km (0.055 R)
- M26: 4,090,754 km (0.087 R)
- M27: 4,379,926 km (0.081 R)
- M28: 4,896,787 km (0.069 R)
- M29: 5,686,963 km (0.072 R)
- M30: 5,750,991 km (0.078 R)
- M31: 5,858,402 km (0.085 R)
- M32: 6,945,231 km (0.119 R)
- M33: 7,036,785 km (0.057 R)
- M34: 7,220,940 km (0.099 R)
- M35: 7,476,752 km (0.083 R)
- M36: 8,021,288 km (0.092 R)
- M37: 8,213,671 km (0.072 R)
- M38: 8,627,608 km (0.101 R)
- M39: 8,726,044 km (0.057 R)
- M40: 8,923,962 km (0.051 R)
- M41: 9,073,410 km (0.11 R)
- M42: 9,961,573 km (0.073 R)
- M43: 10,298,617 km (0.084 R)
- M44: 10,429,216 km (0.115 R)
- M45: 11,197,550 km (0.103 R)
- M46: 11,439,749 km (0.092 R)
- M47: 11,765,274 km (0.118 R)
- M48: 12,370,248 km (0.065 R)
- M49: 12,536,900 km (0.093 R)
- M50: 12,760,399 km (0.1 R)
- M51: 12,928,846 km (0.103 R)
- M52: 14,977,888 km (0.042 R)
- M53: 15,125,990 km (0.071 R)
- M54: 15,274,541 km (0.028 R)
- M55: 15,363,851 km (0.095 R)
- M56: 15,994,406 km (0.095 R)
- M57: 16,328,009 km (0.119 R)
- M58: 16,572,153 km (0.06 R)
- M59: 17,002,247 km (0.065 R)
- M60: 17,591,812 km (0.098 R)
- M61: 17,748,142 km (0.059 R)
- M62: 18,030,583 km (0.105 R)
- M63: 18,219,674 km (0.069 R)
- M64: 18,441,079 km (0.089 R)
- M65: 18,854,867 km (0.077 R)
- M66: 18,982,773 km (0.036 R)
- M67: 19,659,105 km (0.076 R)
- M68: 19,821,269 km (0.038 R)
- M69: 19,951,270 km (0.091 R)
- M70: 20,277,692 km (0.113 R)
- M71: 20,803,678 km (0.086 R)
- M72: 21,134,738 km (0.03 R)
- M73: 21,234,371 km (0.101 R)
- M74: 21,567,525 km (0.113 R)
- M75: 21,701,415 km (0.058 R)
- M76: 21,768,435 km (0.037 R)
- M77: 21,835,455 km (0.072 R)
- M78: 22,543,801 km (0.056 R)
Planet 6 - Ice Giant
Semi-Major Axis: 9.73 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 971.9
Radius: 5.9
Gravity: 27.92 G
Time & Orbit
Eccentricity (e): 0.066
Orbit Range: 9.09 AU - 10.37 AU
Year: 20950 Days
Day: 21.9 Hours
Environment
Temp: -225 °C
Axial Tilt: 28 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (92)
Outer Limit: 88,185,555 km
- M1: 203,902 km (0.115 R)
- M2: 251,773 km (0.11 R)
- M3: 554,260 km (0.102 R)
- M4: 675,285 km (0.1 R)
- M5: 831,764 km (0.095 R)
- M6: 886,667 km (0.058 R)
- M7: 1,209,948 km (0.095 R)
- M8: 1,670,410 km (0.093 R)
- M9: 2,295,579 km (0.081 R)
- M10: 2,776,536 km (0.117 R)
- M11: 3,420,406 km (0.11 R)
- M12: 3,644,952 km (0.085 R)
- M13: 3,874,286 km (0.068 R)
- M14: 4,155,829 km (0.053 R)
- M15: 4,251,123 km (0.095 R)
- M16: 4,347,165 km (0.077 R)
- M17: 4,788,179 km (0.093 R)
- M18: 4,838,145 km (0.109 R)
- M19: 5,398,389 km (0.056 R)
- M20: 6,303,905 km (0.114 R)
- M21: 8,311,658 km (0.088 R)
- M22: 10,239,525 km (0.073 R)
- M23: 10,824,154 km (0.073 R)
- M24: 11,087,446 km (0.068 R)
- M25: 12,025,425 km (0.079 R)
- M26: 12,093,342 km (0.111 R)
- M27: 12,710,882 km (0.114 R)
- M28: 12,988,686 km (0.099 R)
- M29: 13,550,126 km (0.078 R)
- M30: 15,061,364 km (0.118 R)
- M31: 15,948,629 km (0.105 R)
- M32: 16,928,944 km (0.037 R)
- M33: 18,868,181 km (0.056 R)
- M34: 20,713,471 km (0.097 R)
- M35: 20,876,682 km (0.045 R)
- M36: 22,364,134 km (0.096 R)
- M37: 22,615,458 km (0.082 R)
- M38: 22,867,680 km (0.105 R)
- M39: 24,658,815 km (0.078 R)
- M40: 26,583,093 km (0.04 R)
- M41: 27,563,258 km (0.097 R)
- M42: 28,555,092 km (0.072 R)
- M43: 30,295,813 km (0.111 R)
- M44: 32,353,980 km (0.119 R)
- M45: 32,923,051 km (0.11 R)
- M46: 33,495,412 km (0.07 R)
- M47: 35,524,558 km (0.119 R)
- M48: 36,603,308 km (0.073 R)
- M49: 37,295,348 km (0.11 R)
- M50: 37,394,531 km (0.1 R)
- M51: 38,491,682 km (0.117 R)
- M52: 38,692,292 km (0.111 R)
- M53: 40,004,715 km (0.088 R)
- M54: 40,106,292 km (0.064 R)
- M55: 40,411,471 km (0.118 R)
- M56: 41,229,173 km (0.08 R)
- M57: 45,822,725 km (0.062 R)
- M58: 46,461,508 km (0.076 R)
- M59: 47,210,545 km (0.115 R)
- M60: 47,317,956 km (0.083 R)
- M61: 49,918,266 km (0.046 R)
- M62: 50,027,622 km (0.084 R)
- M63: 52,009,495 km (0.098 R)
- M64: 52,231,199 km (0.09 R)
- M65: 52,342,201 km (0.106 R)
- M66: 54,016,799 km (0.079 R)
- M67: 55,030,026 km (0.064 R)
- M68: 57,992,063 km (0.112 R)
- M69: 58,567,566 km (0.043 R)
- M70: 59,492,380 km (0.111 R)
- M71: 60,421,982 km (0.066 R)
- M72: 60,888,577 km (0.072 R)
- M73: 61,473,505 km (0.082 R)
- M74: 63,950,696 km (0.12 R)
- M75: 65,739,887 km (0.115 R)
- M76: 69,123,491 km (0.098 R)
- M77: 69,245,414 km (0.055 R)
- M78: 69,367,336 km (0.096 R)
- M79: 71,944,907 km (0.11 R)
- M80: 74,179,301 km (0.044 R)
- M81: 74,678,808 km (0.071 R)
- M82: 76,688,356 km (0.111 R)
- M83: 77,826,497 km (0.083 R)
- M84: 78,842,865 km (0.113 R)
- M85: 79,097,630 km (0.078 R)
- M86: 79,608,058 km (0.086 R)
- M87: 79,991,477 km (0.071 R)
- M88: 83,600,376 km (0.08 R)
- M89: 83,990,229 km (0.06 R)
- M90: 84,510,829 km (0.106 R)
- M91: 86,341,757 km (0.079 R)
- M92: 87,393,730 km (0.116 R)
Kuiper Belt
Range: 30 - 45 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 416 - 19,137 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.