Star System Generated (Seed: 1768187381)
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 (7 Planets)
Planet 1 - Gas Giant
Semi-Major Axis: 0.6 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 956.3
Radius: 9.4
Gravity: 10.82 G
Time & Orbit
Eccentricity (e): 0.237
Orbit Range: 0.46 AU - 0.74 AU
Year: 315 Days
Day: 5.1 Hours
Environment
Temp: -160 °C
Axial Tilt: 11.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (42)
Outer Limit: 62,233,096 km
- M1: 128,505 km (0.103 R)
- M2: 224,247 km (0.111 R)
- M3: 292,314 km (0.045 R)
- M4: 387,907 km (0.071 R)
- M5: 470,485 km (0.102 R)
- M6: 605,722 km (0.034 R)
- M7: 782,247 km (0.092 R)
- M8: 862,731 km (0.036 R)
- M9: 929,302 km (0.067 R)
- M10: 1,050,177 km (0.053 R)
- M11: 1,117,197 km (0.102 R)
- M12: 1,298,510 km (0.057 R)
- M13: 1,484,609 km (0.119 R)
- M14: 1,653,505 km (0.106 R)
- M15: 1,753,586 km (0.051 R)
- M16: 1,823,299 km (0.105 R)
- M17: 1,893,909 km (0.069 R)
- M18: 2,038,121 km (0.079 R)
- M19: 2,100,354 km (0.099 R)
- M20: 2,191,758 km (0.114 R)
- M21: 2,255,487 km (0.066 R)
- M22: 2,337,616 km (0.056 R)
- M23: 2,444,579 km (0.102 R)
- M24: 2,614,223 km (0.106 R)
- M25: 2,688,124 km (0.108 R)
- M26: 2,869,736 km (0.111 R)
- M27: 3,036,089 km (0.119 R)
- M28: 3,120,462 km (0.09 R)
- M29: 3,251,809 km (0.066 R)
- M30: 3,405,147 km (0.107 R)
- M31: 3,809,360 km (0.103 R)
- M32: 3,900,615 km (0.088 R)
- M33: 4,006,680 km (0.096 R)
- M34: 4,113,792 km (0.111 R)
- M35: 4,279,845 km (0.094 R)
- M36: 4,374,691 km (0.114 R)
- M37: 4,588,915 km (0.086 R)
- M38: 4,768,731 km (0.093 R)
- M39: 4,966,201 km (0.087 R)
- M40: 5,050,574 km (0.042 R)
- M41: 5,174,142 km (0.056 R)
- M42: 5,244,153 km (0.062 R)
Planet 2 - Gas Giant
Semi-Major Axis: 0.68 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 102.8
Radius: 8.8
Gravity: 1.33 G
Time & Orbit
Eccentricity (e): 0.085
Orbit Range: 0.62 AU - 0.74 AU
Year: 380 Days
Day: 8.5 Hours
Environment
Temp: -167 °C
Axial Tilt: 27.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (31)
Outer Limit: 62,233,096 km
- M1: 117,285 km (0.03 R)
- M2: 173,384 km (0.096 R)
- M3: 231,877 km (0.105 R)
- M4: 322,832 km (0.106 R)
- M5: 433,235 km (0.03 R)
- M6: 580,889 km (0.053 R)
- M7: 651,648 km (0.11 R)
- M8: 733,179 km (0.079 R)
- M9: 943,215 km (0.104 R)
- M10: 1,010,982 km (0.107 R)
- M11: 1,080,396 km (0.079 R)
- M12: 1,206,058 km (0.099 R)
- M13: 1,317,808 km (0.105 R)
- M14: 1,384,528 km (0.093 R)
- M15: 1,482,066 km (0.115 R)
- M16: 1,555,070 km (0.074 R)
- M17: 1,615,657 km (0.073 R)
- M18: 1,742,965 km (0.086 R)
- M19: 1,809,536 km (0.09 R)
- M20: 1,869,973 km (0.107 R)
- M21: 1,952,851 km (0.063 R)
- M22: 2,011,194 km (0.112 R)
- M23: 2,125,935 km (0.107 R)
- M24: 2,216,442 km (0.069 R)
- M25: 2,327,294 km (0.1 R)
- M26: 2,397,156 km (0.062 R)
- M27: 2,507,260 km (0.109 R)
- M28: 2,562,911 km (0.057 R)
- M29: 2,691,714 km (0.081 R)
- M30: 2,752,900 km (0.092 R)
- M31: 2,830,990 km (0.074 R)
Planet 3 - Gas Giant
Semi-Major Axis: 0.75 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 856.5
Radius: 13.7
Gravity: 4.56 G
Time & Orbit
Eccentricity (e): 0.133
Orbit Range: 0.65 AU - 0.85 AU
Year: 441 Days
Day: 14.4 Hours
Environment
Temp: -159 °C
Axial Tilt: 36.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (38)
Outer Limit: 62,233,096 km
- M1: 170,990 km (0.087 R)
- M2: 279,150 km (0.025 R)
- M3: 374,593 km (0.056 R)
- M4: 474,524 km (0.112 R)
- M5: 590,612 km (0.097 R)
- M6: 710,291 km (0.119 R)
- M7: 826,229 km (0.061 R)
- M8: 982,559 km (0.117 R)
- M9: 1,114,504 km (0.108 R)
- M10: 1,326,933 km (0.12 R)
- M11: 1,430,006 km (0.094 R)
- M12: 1,553,125 km (0.1 R)
- M13: 1,786,647 km (0.08 R)
- M14: 1,901,688 km (0.099 R)
- M15: 2,019,422 km (0.091 R)
- M16: 2,197,443 km (0.112 R)
- M17: 2,314,728 km (0.039 R)
- M18: 2,528,653 km (0.093 R)
- M19: 2,638,009 km (0.074 R)
- M20: 2,925,985 km (0.038 R)
- M21: 3,063,016 km (0.077 R)
- M22: 3,194,812 km (0.091 R)
- M23: 3,418,760 km (0.113 R)
- M24: 3,647,944 km (0.068 R)
- M25: 3,756,702 km (0.068 R)
- M26: 3,898,221 km (0.075 R)
- M27: 4,033,458 km (0.113 R)
- M28: 4,186,496 km (0.101 R)
- M29: 4,292,412 km (0.116 R)
- M30: 4,607,016 km (0.065 R)
- M31: 4,724,899 km (0.067 R)
- M32: 4,912,196 km (0.056 R)
- M33: 5,067,329 km (0.073 R)
- M34: 5,551,278 km (0.112 R)
- M35: 5,712,993 km (0.074 R)
- M36: 6,142,638 km (0.055 R)
- M37: 6,263,364 km (0.06 R)
- M38: 6,366,137 km (0.115 R)
Planet 4 - Gas Giant
Semi-Major Axis: 1.17 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 363.9
Radius: 10.5
Gravity: 3.3 G
Time & Orbit
Eccentricity (e): 0.025
Orbit Range: 1.14 AU - 1.2 AU
Year: 858 Days
Day: 11.5 Hours
Environment
Temp: -181 °C
Axial Tilt: 2.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (51)
Outer Limit: 62,233,096 km
- M1: 131,197 km (0.117 R)
- M2: 211,083 km (0.08 R)
- M3: 280,047 km (0.115 R)
- M4: 358,287 km (0.109 R)
- M5: 502,948 km (0.077 R)
- M6: 610,210 km (0.086 R)
- M7: 779,704 km (0.099 R)
- M8: 886,218 km (0.077 R)
- M9: 970,890 km (0.058 R)
- M10: 1,075,309 km (0.111 R)
- M11: 1,154,746 km (0.113 R)
- M12: 1,283,849 km (0.092 R)
- M13: 1,537,866 km (0.109 R)
- M14: 1,615,358 km (0.049 R)
- M15: 1,694,046 km (0.04 R)
- M16: 1,842,148 km (0.111 R)
- M17: 1,945,520 km (0.094 R)
- M18: 2,122,345 km (0.089 R)
- M19: 2,223,772 km (0.037 R)
- M20: 2,304,555 km (0.118 R)
- M21: 2,386,385 km (0.059 R)
- M22: 2,599,263 km (0.095 R)
- M23: 2,676,755 km (0.11 R)
- M24: 2,786,709 km (0.095 R)
- M25: 2,946,330 km (0.105 R)
- M26: 3,043,718 km (0.105 R)
- M27: 3,117,320 km (0.071 R)
- M28: 3,546,218 km (0.104 R)
- M29: 3,658,566 km (0.114 R)
- M30: 3,745,781 km (0.025 R)
- M31: 3,869,199 km (0.099 R)
- M32: 4,129,051 km (0.076 R)
- M33: 4,656,383 km (0.068 R)
- M34: 5,010,182 km (0.109 R)
- M35: 5,205,108 km (0.051 R)
- M36: 5,333,164 km (0.073 R)
- M37: 5,462,267 km (0.104 R)
- M38: 5,592,417 km (0.111 R)
- M39: 5,673,050 km (0.11 R)
- M40: 5,815,019 km (0.099 R)
- M41: 5,937,839 km (0.057 R)
- M42: 6,061,257 km (0.112 R)
- M43: 6,269,198 km (0.114 R)
- M44: 6,352,973 km (0.084 R)
- M45: 6,606,691 km (0.098 R)
- M46: 6,788,303 km (0.11 R)
- M47: 6,939,247 km (0.073 R)
- M48: 7,026,014 km (0.097 R)
- M49: 7,134,921 km (0.042 R)
- M50: 7,266,417 km (0.072 R)
- M51: 7,465,083 km (0.11 R)
Planet 5 - Gas Giant
Semi-Major Axis: 2.43 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 630.6
Radius: 8.9
Gravity: 7.96 G
Time & Orbit
Eccentricity (e): 0.014
Orbit Range: 2.4 AU - 2.46 AU
Year: 2569 Days
Day: 12.3 Hours
Environment
Temp: -201 °C
Axial Tilt: 14.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (72)
Outer Limit: 62,233,096 km
- M1: 132,245 km (0.05 R)
- M2: 198,516 km (0.096 R)
- M3: 313,856 km (0.116 R)
- M4: 421,118 km (0.078 R)
- M5: 542,591 km (0.11 R)
- M6: 642,074 km (0.108 R)
- M7: 766,390 km (0.066 R)
- M8: 870,061 km (0.095 R)
- M9: 1,029,682 km (0.12 R)
- M10: 1,092,064 km (0.113 R)
- M11: 1,253,929 km (0.117 R)
- M12: 1,309,729 km (0.114 R)
- M13: 1,366,277 km (0.092 R)
- M14: 1,674,449 km (0.053 R)
- M15: 2,017,477 km (0.096 R)
- M16: 2,110,078 km (0.081 R)
- M17: 2,217,639 km (0.11 R)
- M18: 2,299,618 km (0.032 R)
- M19: 2,368,583 km (0.034 R)
- M20: 2,651,921 km (0.101 R)
- M21: 2,827,101 km (0.093 R)
- M22: 3,006,169 km (0.046 R)
- M23: 3,250,762 km (0.053 R)
- M24: 3,391,234 km (0.094 R)
- M25: 3,501,937 km (0.087 R)
- M26: 3,775,701 km (0.087 R)
- M27: 4,344,173 km (0.081 R)
- M28: 4,481,803 km (0.059 R)
- M29: 4,603,426 km (0.095 R)
- M30: 4,690,940 km (0.091 R)
- M31: 4,796,856 km (0.104 R)
- M32: 5,559,805 km (0.101 R)
- M33: 5,728,252 km (0.111 R)
- M34: 5,822,499 km (0.085 R)
- M35: 6,050,935 km (0.109 R)
- M36: 6,243,617 km (0.104 R)
- M37: 6,457,841 km (0.114 R)
- M38: 6,773,941 km (0.12 R)
- M39: 7,034,391 km (0.037 R)
- M40: 7,094,978 km (0.1 R)
- M41: 7,257,442 km (0.101 R)
- M42: 7,982,542 km (0.115 R)
- M43: 8,579,139 km (0.09 R)
- M44: 9,345,080 km (0.077 R)
- M45: 9,702,469 km (0.107 R)
- M46: 9,792,527 km (0.092 R)
- M47: 9,996,279 km (0.063 R)
- M48: 10,247,005 km (0.049 R)
- M49: 10,315,820 km (0.104 R)
- M50: 10,731,702 km (0.03 R)
- M51: 10,801,565 km (0.084 R)
- M52: 11,200,243 km (0.03 R)
- M53: 11,413,270 km (0.111 R)
- M54: 11,532,201 km (0.057 R)
- M55: 11,699,451 km (0.09 R)
- M56: 11,939,705 km (0.1 R)
- M57: 12,254,459 km (0.094 R)
- M58: 13,016,062 km (0.034 R)
- M59: 13,190,194 km (0.06 R)
- M60: 14,046,941 km (0.103 R)
- M61: 14,225,561 km (0.08 R)
- M62: 14,947,520 km (0.118 R)
- M63: 15,286,808 km (0.113 R)
- M64: 15,391,676 km (0.116 R)
- M65: 15,628,639 km (0.118 R)
- M66: 16,319,781 km (0.054 R)
- M67: 17,238,611 km (0.065 R)
- M68: 17,621,881 km (0.096 R)
- M69: 17,704,459 km (0.117 R)
- M70: 18,091,020 km (0.076 R)
- M71: 18,508,398 km (0.049 R)
- M72: 18,704,371 km (0.067 R)
Planet 6 - Gas Giant
Semi-Major Axis: 5.63 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 931.1
Radius: 10.7
Gravity: 8.13 G
Time & Orbit
Eccentricity (e): 0.175
Orbit Range: 4.64 AU - 6.62 AU
Year: 9061 Days
Day: 5.1 Hours
Environment
Temp: -236 °C
Axial Tilt: 21 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (90)
Outer Limit: 62,233,096 km
- M1: 206,595 km (0.117 R)
- M2: 273,315 km (0.033 R)
- M3: 340,934 km (0.077 R)
- M4: 529,726 km (0.112 R)
- M5: 606,320 km (0.057 R)
- M6: 687,402 km (0.065 R)
- M7: 772,673 km (0.062 R)
- M8: 917,185 km (0.106 R)
- M9: 1,151,455 km (0.111 R)
- M10: 1,427,463 km (0.089 R)
- M11: 1,820,157 km (0.102 R)
- M12: 2,041,562 km (0.078 R)
- M13: 2,984,926 km (0.111 R)
- M14: 3,700,902 km (0.1 R)
- M15: 4,207,141 km (0.061 R)
- M16: 4,802,840 km (0.119 R)
- M17: 5,145,269 km (0.118 R)
- M18: 5,319,551 km (0.108 R)
- M19: 6,146,079 km (0.029 R)
- M20: 6,256,781 km (0.09 R)
- M21: 6,668,774 km (0.044 R)
- M22: 6,782,618 km (0.106 R)
- M23: 7,050,847 km (0.079 R)
- M24: 7,128,189 km (0.116 R)
- M25: 7,322,666 km (0.117 R)
- M26: 7,597,926 km (0.093 R)
- M27: 7,796,592 km (0.1 R)
- M28: 7,916,719 km (0.101 R)
- M29: 8,280,541 km (0.095 R)
- M30: 8,815,803 km (0.118 R)
- M31: 8,941,016 km (0.073 R)
- M32: 9,532,676 km (0.097 R)
- M33: 9,790,283 km (0.099 R)
- M34: 12,395,680 km (0.104 R)
- M35: 13,485,051 km (0.115 R)
- M36: 13,677,584 km (0.09 R)
- M37: 14,703,526 km (0.048 R)
- M38: 14,901,743 km (0.1 R)
- M39: 15,501,780 km (0.111 R)
- M40: 16,211,921 km (0.084 R)
- M41: 16,622,418 km (0.12 R)
- M42: 17,611,110 km (0.098 R)
- M43: 18,245,256 km (0.069 R)
- M44: 18,725,913 km (0.027 R)
- M45: 19,972,961 km (0.119 R)
- M46: 20,302,825 km (0.091 R)
- M47: 20,413,078 km (0.104 R)
- M48: 21,079,238 km (0.07 R)
- M49: 21,190,838 km (0.085 R)
- M50: 21,414,935 km (0.103 R)
- M51: 21,527,134 km (0.104 R)
- M52: 21,808,826 km (0.101 R)
- M53: 24,047,110 km (0.09 R)
- M54: 25,223,099 km (0.081 R)
- M55: 25,639,130 km (0.042 R)
- M56: 25,758,360 km (0.056 R)
- M57: 27,569,691 km (0.105 R)
- M58: 27,814,283 km (0.098 R)
- M59: 28,305,712 km (0.114 R)
- M60: 30,236,722 km (0.084 R)
- M61: 30,932,202 km (0.09 R)
- M62: 31,953,058 km (0.101 R)
- M63: 32,403,198 km (0.034 R)
- M64: 33,570,361 km (0.053 R)
- M65: 34,159,028 km (0.062 R)
- M66: 34,487,545 km (0.058 R)
- M67: 34,883,231 km (0.11 R)
- M68: 36,346,747 km (0.069 R)
- M69: 36,413,618 km (0.119 R)
- M70: 36,749,315 km (0.109 R)
- M71: 37,018,591 km (0.095 R)
- M72: 37,153,379 km (0.11 R)
- M73: 38,034,062 km (0.099 R)
- M74: 38,238,263 km (0.093 R)
- M75: 39,264,654 km (0.114 R)
- M76: 40,438,848 km (0.106 R)
- M77: 41,414,525 km (0.068 R)
- M78: 41,975,517 km (0.111 R)
- M79: 42,468,592 km (0.105 R)
- M80: 42,892,552 km (0.074 R)
- M81: 43,247,099 km (0.099 R)
- M82: 43,389,067 km (0.077 R)
- M83: 44,890,132 km (0.079 R)
- M84: 45,322,021 km (0.096 R)
- M85: 45,755,406 km (0.048 R)
- M86: 45,827,812 km (0.115 R)
- M87: 47,356,104 km (0.108 R)
- M88: 47,649,016 km (0.109 R)
- M89: 49,049,103 km (0.117 R)
- M90: 49,197,205 km (0.102 R)
Planet 7 - Ice Giant
Semi-Major Axis: 7.89 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 663.5
Radius: 3.3
Gravity: 60.93 G
Time & Orbit
Eccentricity (e): 0.187
Orbit Range: 6.41 AU - 9.37 AU
Year: 15032 Days
Day: 22.6 Hours
Environment
Temp: -236 °C
Axial Tilt: 108.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (92)
Outer Limit: 62,233,096 km
- M1: 51,312 km (0.081 R)
- M2: 85,570 km (0.117 R)
- M3: 144,063 km (0.111 R)
- M4: 166,951 km (0.108 R)
- M5: 216,917 km (0.11 R)
- M6: 316,998 km (0.113 R)
- M7: 736,321 km (0.1 R)
- M8: 1,292,974 km (0.115 R)
- M9: 1,318,406 km (0.118 R)
- M10: 2,529,999 km (0.094 R)
- M11: 3,368,944 km (0.12 R)
- M12: 3,439,405 km (0.046 R)
- M13: 4,247,383 km (0.105 R)
- M14: 4,949,745 km (0.098 R)
- M15: 5,070,171 km (0.075 R)
- M16: 6,068,886 km (0.098 R)
- M17: 6,284,307 km (0.115 R)
- M18: 6,458,589 km (0.115 R)
- M19: 6,678,647 km (0.07 R)
- M20: 6,811,789 km (0.1 R)
- M21: 7,035,737 km (0.109 R)
- M22: 7,399,111 km (0.102 R)
- M23: 8,573,155 km (0.093 R)
- M24: 8,960,912 km (0.12 R)
- M25: 9,354,504 km (0.09 R)
- M26: 9,404,021 km (0.088 R)
- M27: 9,803,896 km (0.051 R)
- M28: 9,854,161 km (0.111 R)
- M29: 9,955,140 km (0.1 R)
- M30: 12,588,960 km (0.084 R)
- M31: 13,195,579 km (0.102 R)
- M32: 14,151,809 km (0.045 R)
- M33: 15,421,895 km (0.12 R)
- M34: 15,774,497 km (0.083 R)
- M35: 16,011,161 km (0.078 R)
- M36: 16,248,872 km (0.087 R)
- M37: 16,547,768 km (0.107 R)
- M38: 16,607,757 km (0.115 R)
- M39: 16,969,186 km (0.104 R)
- M40: 17,394,193 km (0.096 R)
- M41: 17,945,611 km (0.098 R)
- M42: 18,316,464 km (0.095 R)
- M43: 18,378,547 km (0.111 R)
- M44: 18,502,863 km (0.031 R)
- M45: 18,752,392 km (0.065 R)
- M46: 18,940,138 km (0.111 R)
- M47: 19,317,723 km (0.115 R)
- M48: 19,952,466 km (0.088 R)
- M49: 20,787,971 km (0.105 R)
- M50: 21,569,171 km (0.119 R)
- M51: 21,634,694 km (0.104 R)
- M52: 21,963,361 km (0.058 R)
- M53: 22,161,279 km (0.112 R)
- M54: 22,758,773 km (0.069 R)
- M55: 24,582,969 km (0.115 R)
- M56: 24,719,851 km (0.113 R)
- M57: 25,547,128 km (0.097 R)
- M58: 26,033,769 km (0.104 R)
- M59: 26,664,025 km (0.102 R)
- M60: 26,875,257 km (0.061 R)
- M61: 28,369,142 km (0.074 R)
- M62: 28,584,712 km (0.114 R)
- M63: 30,035,961 km (0.069 R)
- M64: 32,332,139 km (0.086 R)
- M65: 32,933,822 km (0.044 R)
- M66: 33,236,159 km (0.117 R)
- M67: 35,377,353 km (0.047 R)
- M68: 35,764,363 km (0.114 R)
- M69: 36,777,141 km (0.108 R)
- M70: 37,247,775 km (0.116 R)
- M71: 39,310,132 km (0.109 R)
- M72: 40,840,518 km (0.047 R)
- M73: 43,461,772 km (0.103 R)
- M74: 45,211,169 km (0.109 R)
- M75: 45,379,018 km (0.118 R)
- M76: 45,547,017 km (0.079 R)
- M77: 48,434,854 km (0.087 R)
- M78: 49,123,004 km (0.089 R)
- M79: 52,788,002 km (0.096 R)
- M80: 53,053,090 km (0.118 R)
- M81: 53,407,337 km (0.056 R)
- M82: 53,495,899 km (0.112 R)
- M83: 53,584,611 km (0.093 R)
- M84: 55,100,486 km (0.086 R)
- M85: 55,548,831 km (0.09 R)
- M86: 55,908,614 km (0.116 R)
- M87: 56,539,767 km (0.034 R)
- M88: 56,811,138 km (0.116 R)
- M89: 56,901,644 km (0.087 R)
- M90: 56,992,151 km (0.06 R)
- M91: 60,561,556 km (0.056 R)
- M92: 61,674,265 km (0.094 R)
Kuiper Belt
Range: 30 - 51 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 462 - 20,183 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.