Star System Generated (Seed: 1766827993)
Star Details
Spectral Class: M1V
Temperature: 3,483 K
Mass: 0.32 sol
Luminosity: 0.02 lux
Habitable Zone (HZ)
Inner Boundary: 0.13 AU
Outer Boundary: 0.19 AU
Physical Limits
Snow Line: 0.68 AU
Max System Radius: 11.3 AU
Planetary System (7 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 0.66 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 1.26
Radius: 1.1
Gravity: 1.04 G
Time & Orbit
Eccentricity (e): 0.01
Orbit Range: 0.65 AU - 0.67 AU
Year: 346 Days
Day: 17.8 Hours
Environment
Temp: -142 °C
Axial Tilt: 8 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Planet 2 - Gas Giant
Semi-Major Axis: 1.05 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 319.3
Radius: 13.4
Gravity: 1.78 G
Time & Orbit
Eccentricity (e): 0.035
Orbit Range: 1.01 AU - 1.09 AU
Year: 695 Days
Day: 15 Hours
Environment
Temp: -156 °C
Axial Tilt: 0.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (44)
Outer Limit: 31,012,507 km
- M1: 166,802 km (0.094 R)
- M2: 258,804 km (0.117 R)
- M3: 357,090 km (0.034 R)
- M4: 449,990 km (0.113 R)
- M5: 543,339 km (0.093 R)
- M6: 629,657 km (0.084 R)
- M7: 713,432 km (0.106 R)
- M8: 810,521 km (0.049 R)
- M9: 899,083 km (0.12 R)
- M10: 1,019,659 km (0.115 R)
- M11: 1,116,599 km (0.116 R)
- M12: 1,201,570 km (0.054 R)
- M13: 1,294,171 km (0.111 R)
- M14: 1,576,313 km (0.116 R)
- M15: 1,678,638 km (0.116 R)
- M16: 1,771,688 km (0.084 R)
- M17: 1,884,634 km (0.107 R)
- M18: 1,969,306 km (0.031 R)
- M19: 2,168,122 km (0.047 R)
- M20: 2,341,207 km (0.069 R)
- M21: 2,539,125 km (0.106 R)
- M22: 2,680,943 km (0.086 R)
- M23: 2,770,104 km (0.114 R)
- M24: 2,930,323 km (0.111 R)
- M25: 3,015,295 km (0.119 R)
- M26: 3,108,195 km (0.089 R)
- M27: 3,245,825 km (0.095 R)
- M28: 3,452,270 km (0.088 R)
- M29: 3,747,427 km (0.097 R)
- M30: 3,878,624 km (0.06 R)
- M31: 4,098,084 km (0.093 R)
- M32: 4,265,484 km (0.092 R)
- M33: 4,541,492 km (0.077 R)
- M34: 4,706,499 km (0.065 R)
- M35: 4,924,164 km (0.028 R)
- M36: 5,008,686 km (0.058 R)
- M37: 5,136,592 km (0.106 R)
- M38: 5,239,665 km (0.102 R)
- M39: 5,343,337 km (0.106 R)
- M40: 5,561,750 km (0.089 R)
- M41: 5,720,922 km (0.097 R)
- M42: 5,917,493 km (0.112 R)
- M43: 6,025,653 km (0.095 R)
- M44: 6,134,410 km (0.057 R)
Planet 3 - Gas Giant
Semi-Major Axis: 1.98 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 158.8
Radius: 14.5
Gravity: 0.76 G
Time & Orbit
Eccentricity (e): 0.102
Orbit Range: 1.78 AU - 2.18 AU
Year: 1799 Days
Day: 12.8 Hours
Environment
Temp: -193 °C
Axial Tilt: 38.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (50)
Outer Limit: 31,012,507 km
- M1: 206,295 km (0.091 R)
- M2: 299,046 km (0.105 R)
- M3: 437,125 km (0.117 R)
- M4: 587,022 km (0.101 R)
- M5: 683,213 km (0.068 R)
- M6: 819,647 km (0.115 R)
- M7: 997,369 km (0.071 R)
- M8: 1,091,466 km (0.075 R)
- M9: 1,262,456 km (0.047 R)
- M10: 1,358,498 km (0.118 R)
- M11: 1,457,233 km (0.059 R)
- M12: 1,677,441 km (0.109 R)
- M13: 1,854,116 km (0.1 R)
- M14: 2,028,996 km (0.071 R)
- M15: 2,168,272 km (0.04 R)
- M16: 2,259,975 km (0.104 R)
- M17: 2,370,229 km (0.095 R)
- M18: 2,676,456 km (0.032 R)
- M19: 2,829,793 km (0.097 R)
- M20: 2,976,998 km (0.12 R)
- M21: 3,145,744 km (0.101 R)
- M22: 3,414,571 km (0.06 R)
- M23: 3,611,442 km (0.032 R)
- M24: 3,852,594 km (0.046 R)
- M25: 4,006,081 km (0.058 R)
- M26: 4,372,297 km (0.097 R)
- M27: 4,468,189 km (0.105 R)
- M28: 4,958,721 km (0.098 R)
- M29: 5,284,096 km (0.115 R)
- M30: 5,478,124 km (0.09 R)
- M31: 5,593,315 km (0.113 R)
- M32: 5,697,734 km (0.105 R)
- M33: 5,802,901 km (0.099 R)
- M34: 5,943,972 km (0.102 R)
- M35: 6,181,833 km (0.088 R)
- M36: 6,277,875 km (0.038 R)
- M37: 6,422,835 km (0.084 R)
- M38: 6,520,074 km (0.036 R)
- M39: 6,679,246 km (0.104 R)
- M40: 6,901,847 km (0.095 R)
- M41: 7,076,578 km (0.071 R)
- M42: 7,405,244 km (0.088 R)
- M43: 7,584,163 km (0.075 R)
- M44: 7,738,847 km (0.057 R)
- M45: 7,972,669 km (0.098 R)
- M46: 8,090,552 km (0.111 R)
- M47: 8,354,443 km (0.116 R)
- M48: 8,594,547 km (0.071 R)
- M49: 8,918,127 km (0.091 R)
- M50: 9,013,272 km (0.089 R)
Planet 4 - Gas Giant
Semi-Major Axis: 4.28 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 566.8
Radius: 14
Gravity: 2.89 G
Time & Orbit
Eccentricity (e): 0.162
Orbit Range: 3.59 AU - 4.97 AU
Year: 5717 Days
Day: 12.8 Hours
Environment
Temp: -217 °C
Axial Tilt: 13.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (76)
Outer Limit: 31,012,507 km
- M1: 358,885 km (0.105 R)
- M2: 529,128 km (0.063 R)
- M3: 661,522 km (0.088 R)
- M4: 807,230 km (0.081 R)
- M5: 1,006,345 km (0.076 R)
- M6: 1,222,813 km (0.076 R)
- M7: 1,391,859 km (0.116 R)
- M8: 1,552,676 km (0.084 R)
- M9: 1,788,742 km (0.114 R)
- M10: 1,982,770 km (0.107 R)
- M11: 2,091,677 km (0.098 R)
- M12: 2,430,666 km (0.097 R)
- M13: 2,767,261 km (0.116 R)
- M14: 2,869,287 km (0.112 R)
- M15: 3,376,574 km (0.056 R)
- M16: 3,685,643 km (0.068 R)
- M17: 3,957,911 km (0.093 R)
- M18: 4,716,522 km (0.102 R)
- M19: 4,839,192 km (0.064 R)
- M20: 5,112,956 km (0.07 R)
- M21: 5,213,635 km (0.113 R)
- M22: 5,520,161 km (0.116 R)
- M23: 6,285,055 km (0.076 R)
- M24: 7,083,310 km (0.075 R)
- M25: 7,423,046 km (0.1 R)
- M26: 7,913,578 km (0.093 R)
- M27: 9,201,167 km (0.115 R)
- M28: 9,447,854 km (0.08 R)
- M29: 9,853,563 km (0.113 R)
- M30: 10,585,246 km (0.113 R)
- M31: 11,170,174 km (0.1 R)
- M32: 11,466,677 km (0.118 R)
- M33: 12,439,512 km (0.079 R)
- M34: 12,575,795 km (0.039 R)
- M35: 12,815,601 km (0.102 R)
- M36: 13,160,573 km (0.106 R)
- M37: 13,334,257 km (0.096 R)
- M38: 13,965,859 km (0.071 R)
- M39: 15,112,826 km (0.099 R)
- M40: 15,331,388 km (0.087 R)
- M41: 16,067,111 km (0.107 R)
- M42: 16,178,411 km (0.072 R)
- M43: 16,701,405 km (0.095 R)
- M44: 17,116,390 km (0.065 R)
- M45: 17,764,298 km (0.106 R)
- M46: 17,956,382 km (0.088 R)
- M47: 18,110,617 km (0.07 R)
- M48: 18,420,285 km (0.118 R)
- M49: 18,731,748 km (0.097 R)
- M50: 18,927,272 km (0.086 R)
- M51: 19,202,233 km (0.059 R)
- M52: 19,875,274 km (0.105 R)
- M53: 20,074,837 km (0.102 R)
- M54: 20,395,426 km (0.117 R)
- M55: 20,516,002 km (0.109 R)
- M56: 20,758,051 km (0.035 R)
- M57: 21,122,771 km (0.099 R)
- M58: 21,408,054 km (0.103 R)
- M59: 22,105,928 km (0.1 R)
- M60: 22,686,367 km (0.11 R)
- M61: 23,313,781 km (0.038 R)
- M62: 23,524,265 km (0.089 R)
- M63: 24,074,337 km (0.1 R)
- M64: 24,244,429 km (0.094 R)
- M65: 25,446,299 km (0.077 R)
- M66: 25,923,815 km (0.1 R)
- M67: 26,141,929 km (0.049 R)
- M68: 26,272,976 km (0.085 R)
- M69: 26,579,802 km (0.099 R)
- M70: 26,887,824 km (0.117 R)
- M71: 27,020,068 km (0.088 R)
- M72: 27,196,893 km (0.099 R)
- M73: 28,310,799 km (0.104 R)
- M74: 29,303,231 km (0.065 R)
- M75: 30,261,256 km (0.076 R)
- M76: 30,767,046 km (0.088 R)
Planet 5 - Gas Giant
Semi-Major Axis: 4.56 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 343.6
Radius: 13.7
Gravity: 1.83 G
Time & Orbit
Eccentricity (e): 0.046
Orbit Range: 4.35 AU - 4.77 AU
Year: 6287 Days
Day: 12.1 Hours
Environment
Temp: -209 °C
Axial Tilt: 37.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (67)
Outer Limit: 31,012,507 km
- M1: 216,468 km (0.077 R)
- M2: 426,803 km (0.077 R)
- M3: 578,645 km (0.094 R)
- M4: 870,959 km (0.088 R)
- M5: 1,170,155 km (0.062 R)
- M6: 1,310,777 km (0.081 R)
- M7: 1,457,532 km (0.108 R)
- M8: 1,720,226 km (0.119 R)
- M9: 1,915,152 km (0.109 R)
- M10: 2,049,341 km (0.12 R)
- M11: 2,345,096 km (0.092 R)
- M12: 2,562,612 km (0.064 R)
- M13: 2,882,153 km (0.105 R)
- M14: 3,076,181 km (0.098 R)
- M15: 3,416,367 km (0.041 R)
- M16: 3,580,625 km (0.118 R)
- M17: 4,003,089 km (0.1 R)
- M18: 4,198,464 km (0.057 R)
- M19: 4,576,348 km (0.108 R)
- M20: 4,895,890 km (0.111 R)
- M21: 4,988,491 km (0.117 R)
- M22: 5,460,771 km (0.077 R)
- M23: 5,750,991 km (0.099 R)
- M24: 6,046,447 km (0.079 R)
- M25: 6,246,160 km (0.109 R)
- M26: 6,575,425 km (0.05 R)
- M27: 7,198,350 km (0.041 R)
- M28: 7,330,595 km (0.079 R)
- M29: 7,705,038 km (0.108 R)
- M30: 7,949,032 km (0.116 R)
- M31: 8,306,123 km (0.084 R)
- M32: 8,668,598 km (0.115 R)
- M33: 8,837,494 km (0.098 R)
- M34: 9,495,575 km (0.07 R)
- M35: 9,816,014 km (0.094 R)
- M36: 9,933,448 km (0.119 R)
- M37: 10,437,593 km (0.102 R)
- M38: 11,011,002 km (0.074 R)
- M39: 11,470,866 km (0.116 R)
- M40: 12,536,750 km (0.105 R)
- M41: 12,664,208 km (0.1 R)
- M42: 14,128,173 km (0.117 R)
- M43: 14,896,956 km (0.049 R)
- M44: 15,099,811 km (0.098 R)
- M45: 15,337,522 km (0.113 R)
- M46: 15,645,095 km (0.096 R)
- M47: 16,162,255 km (0.088 R)
- M48: 16,615,088 km (0.085 R)
- M49: 16,755,111 km (0.087 R)
- M50: 17,071,959 km (0.074 R)
- M51: 18,142,183 km (0.049 R)
- M52: 18,431,355 km (0.104 R)
- M53: 19,455,203 km (0.101 R)
- M54: 19,714,007 km (0.08 R)
- M55: 20,197,807 km (0.061 R)
- M56: 20,572,550 km (0.105 R)
- M57: 21,177,075 km (0.063 R)
- M58: 21,329,066 km (0.116 R)
- M59: 21,940,921 km (0.117 R)
- M60: 22,248,943 km (0.105 R)
- M61: 22,674,998 km (0.111 R)
- M62: 23,810,745 km (0.112 R)
- M63: 25,005,284 km (0.109 R)
- M64: 25,367,461 km (0.047 R)
- M65: 25,893,596 km (0.057 R)
- M66: 26,382,632 km (0.096 R)
- M67: 26,628,122 km (0.064 R)
Planet 6 - Ice Giant
Semi-Major Axis: 6.17 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 965
Radius: 7.8
Gravity: 15.86 G
Time & Orbit
Eccentricity (e): 0.054
Orbit Range: 5.84 AU - 6.5 AU
Year: 9896 Days
Day: 21.8 Hours
Environment
Temp: -226 °C
Axial Tilt: 27.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (90)
Outer Limit: 31,012,507 km
- M1: 101,727 km (0.113 R)
- M2: 166,951 km (0.111 R)
- M3: 259,104 km (0.084 R)
- M4: 373,695 km (0.104 R)
- M5: 571,913 km (0.111 R)
- M6: 879,785 km (0.091 R)
- M7: 939,175 km (0.051 R)
- M8: 1,126,023 km (0.072 R)
- M9: 1,730,997 km (0.078 R)
- M10: 2,310,988 km (0.113 R)
- M11: 2,536,133 km (0.036 R)
- M12: 2,797,779 km (0.114 R)
- M13: 2,947,078 km (0.079 R)
- M14: 3,191,222 km (0.052 R)
- M15: 3,284,571 km (0.086 R)
- M16: 3,731,868 km (0.078 R)
- M17: 4,029,718 km (0.098 R)
- M18: 4,438,718 km (0.067 R)
- M19: 4,825,279 km (0.106 R)
- M20: 4,968,444 km (0.111 R)
- M21: 5,076,903 km (0.11 R)
- M22: 6,164,629 km (0.119 R)
- M23: 6,281,166 km (0.114 R)
- M24: 6,955,553 km (0.088 R)
- M25: 7,362,908 km (0.109 R)
- M26: 7,946,190 km (0.113 R)
- M27: 8,761,498 km (0.114 R)
- M28: 11,553,743 km (0.066 R)
- M29: 11,842,167 km (0.119 R)
- M30: 12,084,217 km (0.084 R)
- M31: 13,369,711 km (0.091 R)
- M32: 13,723,211 km (0.074 R)
- M33: 13,875,651 km (0.096 R)
- M34: 13,926,515 km (0.12 R)
- M35: 13,977,527 km (0.112 R)
- M36: 14,079,703 km (0.102 R)
- M37: 14,336,263 km (0.064 R)
- M38: 14,490,947 km (0.064 R)
- M39: 15,010,650 km (0.103 R)
- M40: 16,014,602 km (0.041 R)
- M41: 16,121,564 km (0.062 R)
- M42: 16,175,120 km (0.081 R)
- M43: 16,336,237 km (0.098 R)
- M44: 16,605,812 km (0.066 R)
- M45: 17,258,807 km (0.093 R)
- M46: 18,815,074 km (0.082 R)
- M47: 19,211,059 km (0.081 R)
- M48: 22,477,080 km (0.105 R)
- M49: 23,259,477 km (0.084 R)
- M50: 23,441,388 km (0.092 R)
- M51: 23,867,443 km (0.048 R)
- M52: 24,912,833 km (0.111 R)
- M53: 25,472,329 km (0.118 R)
- M54: 25,722,307 km (0.12 R)
- M55: 26,036,013 km (0.114 R)
- M56: 28,137,714 km (0.045 R)
- M57: 28,202,191 km (0.098 R)
- M58: 28,266,817 km (0.091 R)
- M59: 28,785,323 km (0.066 R)
- M60: 28,915,324 km (0.113 R)
- M61: 30,029,229 km (0.08 R)
- M62: 30,690,901 km (0.095 R)
- M63: 31,156,898 km (0.102 R)
- M64: 31,894,116 km (0.081 R)
- M65: 33,112,591 km (0.114 R)
- M66: 34,139,580 km (0.048 R)
- M67: 34,346,325 km (0.114 R)
- M68: 34,415,289 km (0.055 R)
- M69: 35,874,617 km (0.066 R)
- M70: 35,944,479 km (0.076 R)
- M71: 36,224,975 km (0.114 R)
- M72: 37,353,840 km (0.101 R)
- M73: 37,424,899 km (0.065 R)
- M74: 37,993,970 km (0.108 R)
- M75: 41,028,712 km (0.053 R)
- M76: 42,131,398 km (0.086 R)
- M77: 43,392,658 km (0.11 R)
- M78: 43,766,054 km (0.109 R)
- M79: 44,065,549 km (0.084 R)
- M80: 45,270,111 km (0.089 R)
- M81: 46,256,709 km (0.101 R)
- M82: 46,867,517 km (0.11 R)
- M83: 47,403,975 km (0.049 R)
- M84: 48,405,832 km (0.109 R)
- M85: 48,638,008 km (0.1 R)
- M86: 49,960,752 km (0.112 R)
- M87: 50,117,231 km (0.061 R)
- M88: 50,587,418 km (0.116 R)
- M89: 51,690,103 km (0.096 R)
- M90: 51,927,366 km (0.071 R)
Planet 7 - Ice Giant
Semi-Major Axis: 6.71 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 147.3
Radius: 3.3
Gravity: 13.53 G
Time & Orbit
Eccentricity (e): 0.243
Orbit Range: 5.08 AU - 8.34 AU
Year: 11223 Days
Day: 16.6 Hours
Environment
Temp: -230 °C
Axial Tilt: 5.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (88)
Outer Limit: 31,012,507 km
- M1: 46,076 km (0.104 R)
- M2: 218,263 km (0.069 R)
- M3: 397,781 km (0.11 R)
- M4: 507,586 km (0.099 R)
- M5: 689,945 km (0.069 R)
- M6: 849,566 km (0.114 R)
- M7: 1,280,558 km (0.109 R)
- M8: 1,312,422 km (0.088 R)
- M9: 1,344,586 km (0.113 R)
- M10: 1,543,252 km (0.118 R)
- M11: 1,594,414 km (0.11 R)
- M12: 1,680,882 km (0.118 R)
- M13: 1,768,845 km (0.12 R)
- M14: 1,840,353 km (0.115 R)
- M15: 1,894,507 km (0.031 R)
- M16: 1,931,009 km (0.03 R)
- M17: 2,269,699 km (0.115 R)
- M18: 2,485,569 km (0.085 R)
- M19: 2,832,037 km (0.043 R)
- M20: 2,915,812 km (0.096 R)
- M21: 4,005,782 km (0.085 R)
- M22: 4,123,366 km (0.107 R)
- M23: 4,147,003 km (0.034 R)
- M24: 4,170,789 km (0.097 R)
- M25: 4,242,147 km (0.115 R)
- M26: 4,290,018 km (0.113 R)
- M27: 4,313,954 km (0.095 R)
- M28: 5,181,173 km (0.113 R)
- M29: 5,700,128 km (0.079 R)
- M30: 5,832,372 km (0.111 R)
- M31: 6,100,152 km (0.081 R)
- M32: 6,564,355 km (0.113 R)
- M33: 6,983,378 km (0.088 R)
- M34: 7,039,777 km (0.09 R)
- M35: 7,497,396 km (0.081 R)
- M36: 7,642,357 km (0.065 R)
- M37: 7,700,700 km (0.065 R)
- M38: 7,935,120 km (0.037 R)
- M39: 8,471,129 km (0.072 R)
- M40: 8,713,178 km (0.069 R)
- M41: 8,988,139 km (0.116 R)
- M42: 9,111,258 km (0.045 R)
- M43: 9,390,408 km (0.076 R)
- M44: 9,798,361 km (0.116 R)
- M45: 10,148,271 km (0.038 R)
- M46: 10,502,070 km (0.108 R)
- M47: 10,566,846 km (0.078 R)
- M48: 10,696,846 km (0.087 R)
- M49: 11,122,751 km (0.071 R)
- M50: 11,221,935 km (0.114 R)
- M51: 11,856,230 km (0.087 R)
- M52: 12,915,981 km (0.045 R)
- M53: 13,650,955 km (0.039 R)
- M54: 13,863,384 km (0.117 R)
- M55: 13,934,443 km (0.114 R)
- M56: 14,435,297 km (0.025 R)
- M57: 14,651,765 km (0.08 R)
- M58: 14,832,928 km (0.072 R)
- M59: 16,196,662 km (0.079 R)
- M60: 16,346,559 km (0.12 R)
- M61: 16,685,249 km (0.079 R)
- M62: 16,874,490 km (0.109 R)
- M63: 17,064,480 km (0.105 R)
- M64: 17,178,772 km (0.075 R)
- M65: 17,331,512 km (0.031 R)
- M66: 17,676,933 km (0.045 R)
- M67: 17,753,976 km (0.071 R)
- M68: 19,120,702 km (0.107 R)
- M69: 19,239,333 km (0.117 R)
- M70: 19,398,057 km (0.078 R)
- M71: 19,876,620 km (0.105 R)
- M72: 21,294,509 km (0.052 R)
- M73: 22,202,418 km (0.06 R)
- M74: 22,535,722 km (0.116 R)
- M75: 23,545,358 km (0.047 R)
- M76: 24,655,674 km (0.085 R)
- M77: 24,698,608 km (0.092 R)
- M78: 24,957,413 km (0.075 R)
- M79: 25,173,881 km (0.115 R)
- M80: 25,521,247 km (0.041 R)
- M81: 26,352,862 km (0.084 R)
- M82: 26,396,843 km (0.097 R)
- M83: 26,838,307 km (0.094 R)
- M84: 26,926,869 km (0.032 R)
- M85: 27,371,324 km (0.041 R)
- M86: 28,900,214 km (0.093 R)
- M87: 30,502,856 km (0.12 R)
- M88: 30,966,011 km (0.098 R)
Kuiper Belt
Range: 30 - 46 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 192 - 13,740 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.