Star System Generated (Seed: 1768477548)
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: 0.52 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 503.5
Radius: 9
Gravity: 6.22 G
Time & Orbit
Eccentricity (e): 0.205
Orbit Range: 0.41 AU - 0.63 AU
Year: 264 Days
Day: 7.3 Hours
Environment
Temp: -133 °C
Axial Tilt: 37.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (39)
Outer Limit: 26,910,503 km
- M1: 113,694 km (0.104 R)
- M2: 199,264 km (0.115 R)
- M3: 258,804 km (0.113 R)
- M4: 343,327 km (0.035 R)
- M5: 400,773 km (0.087 R)
- M6: 474,973 km (0.051 R)
- M7: 538,403 km (0.077 R)
- M8: 599,289 km (0.069 R)
- M9: 663,018 km (0.056 R)
- M10: 726,148 km (0.112 R)
- M11: 794,664 km (0.116 R)
- M12: 888,611 km (0.093 R)
- M13: 962,662 km (0.114 R)
- M14: 1,052,870 km (0.046 R)
- M15: 1,146,069 km (0.114 R)
- M16: 1,227,151 km (0.034 R)
- M17: 1,446,761 km (0.106 R)
- M18: 1,571,526 km (0.06 R)
- M19: 1,641,388 km (0.053 R)
- M20: 1,801,757 km (0.098 R)
- M21: 1,870,871 km (0.045 R)
- M22: 2,002,816 km (0.065 R)
- M23: 2,183,680 km (0.073 R)
- M24: 2,257,581 km (0.097 R)
- M25: 2,370,079 km (0.051 R)
- M26: 2,431,713 km (0.08 R)
- M27: 2,508,457 km (0.057 R)
- M28: 2,566,501 km (0.068 R)
- M29: 2,753,349 km (0.114 R)
- M30: 2,838,470 km (0.109 R)
- M31: 2,944,684 km (0.113 R)
- M32: 3,047,309 km (0.094 R)
- M33: 3,114,478 km (0.092 R)
- M34: 3,234,755 km (0.106 R)
- M35: 3,351,291 km (0.074 R)
- M36: 3,431,476 km (0.1 R)
- M37: 3,637,771 km (0.071 R)
- M38: 3,731,270 km (0.074 R)
- M39: 3,814,596 km (0.1 R)
Planet 2 - Gas Giant
Semi-Major Axis: 0.63 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 421.9
Radius: 8
Gravity: 6.59 G
Time & Orbit
Eccentricity (e): 0.217
Orbit Range: 0.49 AU - 0.77 AU
Year: 351 Days
Day: 7.7 Hours
Environment
Temp: -145 °C
Axial Tilt: 34.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (45)
Outer Limit: 26,910,503 km
- M1: 103,073 km (0.106 R)
- M2: 209,287 km (0.051 R)
- M3: 264,040 km (0.064 R)
- M4: 338,091 km (0.109 R)
- M5: 426,055 km (0.104 R)
- M6: 511,026 km (0.083 R)
- M7: 562,039 km (0.03 R)
- M8: 614,997 km (0.056 R)
- M9: 666,459 km (0.096 R)
- M10: 753,524 km (0.11 R)
- M11: 834,008 km (0.071 R)
- M12: 888,163 km (0.065 R)
- M13: 966,103 km (0.109 R)
- M14: 1,113,158 km (0.118 R)
- M15: 1,263,504 km (0.074 R)
- M16: 1,317,957 km (0.1 R)
- M17: 1,373,308 km (0.106 R)
- M18: 1,486,255 km (0.086 R)
- M19: 1,561,802 km (0.102 R)
- M20: 1,643,333 km (0.093 R)
- M21: 1,735,634 km (0.12 R)
- M22: 1,787,096 km (0.111 R)
- M23: 1,843,943 km (0.116 R)
- M24: 1,906,026 km (0.108 R)
- M25: 1,973,944 km (0.045 R)
- M26: 2,157,052 km (0.041 R)
- M27: 2,340,608 km (0.038 R)
- M28: 2,471,207 km (0.074 R)
- M29: 2,556,029 km (0.108 R)
- M30: 2,609,436 km (0.026 R)
- M31: 2,679,597 km (0.043 R)
- M32: 2,938,551 km (0.065 R)
- M33: 3,079,622 km (0.09 R)
- M34: 3,194,064 km (0.056 R)
- M35: 3,280,831 km (0.063 R)
- M36: 3,356,677 km (0.101 R)
- M37: 3,468,726 km (0.077 R)
- M38: 3,528,116 km (0.095 R)
- M39: 3,690,280 km (0.095 R)
- M40: 3,793,652 km (0.042 R)
- M41: 3,978,406 km (0.114 R)
- M42: 4,065,621 km (0.116 R)
- M43: 4,141,019 km (0.097 R)
- M44: 4,248,430 km (0.071 R)
- M45: 4,331,307 km (0.107 R)
Planet 3 - Gas Giant
Semi-Major Axis: 1.02 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 509.4
Radius: 8.4
Gravity: 7.22 G
Time & Orbit
Eccentricity (e): 0.224
Orbit Range: 0.79 AU - 1.25 AU
Year: 724 Days
Day: 5.9 Hours
Environment
Temp: -177 °C
Axial Tilt: 35.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (64)
Outer Limit: 26,910,503 km
- M1: 118,182 km (0.06 R)
- M2: 173,085 km (0.111 R)
- M3: 230,680 km (0.093 R)
- M4: 295,456 km (0.105 R)
- M5: 406,009 km (0.071 R)
- M6: 481,705 km (0.116 R)
- M7: 536,757 km (0.115 R)
- M8: 644,468 km (0.111 R)
- M9: 866,920 km (0.064 R)
- M10: 952,041 km (0.091 R)
- M11: 1,113,607 km (0.071 R)
- M12: 1,426,117 km (0.108 R)
- M13: 1,527,693 km (0.111 R)
- M14: 1,833,472 km (0.09 R)
- M15: 1,888,673 km (0.038 R)
- M16: 1,951,504 km (0.113 R)
- M17: 2,107,834 km (0.103 R)
- M18: 2,165,878 km (0.1 R)
- M19: 2,261,172 km (0.1 R)
- M20: 2,365,292 km (0.112 R)
- M21: 2,478,837 km (0.103 R)
- M22: 2,563,210 km (0.032 R)
- M23: 2,830,093 km (0.105 R)
- M24: 2,894,270 km (0.09 R)
- M25: 2,958,896 km (0.043 R)
- M26: 3,097,873 km (0.034 R)
- M27: 3,297,735 km (0.05 R)
- M28: 3,501,937 km (0.12 R)
- M29: 3,562,224 km (0.116 R)
- M30: 3,622,961 km (0.09 R)
- M31: 3,807,116 km (0.101 R)
- M32: 3,887,001 km (0.066 R)
- M33: 3,940,558 km (0.054 R)
- M34: 4,111,847 km (0.056 R)
- M35: 4,285,530 km (0.103 R)
- M36: 4,489,881 km (0.08 R)
- M37: 4,630,952 km (0.112 R)
- M38: 4,783,093 km (0.115 R)
- M39: 4,859,836 km (0.074 R)
- M40: 5,033,819 km (0.09 R)
- M41: 5,092,312 km (0.083 R)
- M42: 5,210,045 km (0.108 R)
- M43: 5,298,906 km (0.076 R)
- M44: 5,378,193 km (0.031 R)
- M45: 5,508,194 km (0.069 R)
- M46: 5,588,677 km (0.098 R)
- M47: 5,679,633 km (0.114 R)
- M48: 5,791,382 km (0.092 R)
- M49: 5,863,040 km (0.09 R)
- M50: 5,955,491 km (0.077 R)
- M51: 6,048,392 km (0.113 R)
- M52: 6,131,418 km (0.087 R)
- M53: 6,214,894 km (0.095 R)
- M54: 6,309,141 km (0.105 R)
- M55: 6,425,079 km (0.102 R)
- M56: 6,478,037 km (0.085 R)
- M57: 6,627,036 km (0.081 R)
- M58: 6,701,835 km (0.054 R)
- M59: 6,809,396 km (0.095 R)
- M60: 6,982,630 km (0.103 R)
- M61: 7,048,004 km (0.094 R)
- M62: 7,245,174 km (0.106 R)
- M63: 7,388,788 km (0.054 R)
- M64: 7,477,650 km (0.091 R)
Planet 4 - Gas Giant
Semi-Major Axis: 1.25 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 286.5
Radius: 10.6
Gravity: 2.55 G
Time & Orbit
Eccentricity (e): 0.231
Orbit Range: 0.96 AU - 1.54 AU
Year: 982 Days
Day: 14.1 Hours
Environment
Temp: -175 °C
Axial Tilt: 36.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (54)
Outer Limit: 26,910,503 km
- M1: 137,181 km (0.109 R)
- M2: 228,586 km (0.092 R)
- M3: 298,298 km (0.029 R)
- M4: 365,468 km (0.096 R)
- M5: 439,668 km (0.094 R)
- M6: 524,640 km (0.096 R)
- M7: 593,904 km (0.096 R)
- M8: 671,545 km (0.027 R)
- M9: 738,265 km (0.041 R)
- M10: 812,765 km (0.09 R)
- M11: 895,194 km (0.075 R)
- M12: 1,002,605 km (0.094 R)
- M13: 1,143,377 km (0.049 R)
- M14: 1,388,867 km (0.036 R)
- M15: 1,470,397 km (0.115 R)
- M16: 1,638,396 km (0.114 R)
- M17: 1,833,472 km (0.089 R)
- M18: 1,923,529 km (0.1 R)
- M19: 2,246,661 km (0.056 R)
- M20: 2,328,192 km (0.076 R)
- M21: 2,403,439 km (0.111 R)
- M22: 2,487,065 km (0.096 R)
- M23: 2,556,179 km (0.061 R)
- M24: 2,839,368 km (0.072 R)
- M25: 2,968,471 km (0.063 R)
- M26: 3,132,729 km (0.087 R)
- M27: 3,216,055 km (0.072 R)
- M28: 3,359,370 km (0.079 R)
- M29: 3,427,586 km (0.083 R)
- M30: 3,522,132 km (0.112 R)
- M31: 3,591,396 km (0.081 R)
- M32: 3,828,658 km (0.112 R)
- M33: 4,025,978 km (0.101 R)
- M34: 4,116,634 km (0.109 R)
- M35: 4,309,615 km (0.037 R)
- M36: 4,411,791 km (0.055 R)
- M37: 4,524,288 km (0.054 R)
- M38: 4,742,552 km (0.056 R)
- M39: 4,819,295 km (0.079 R)
- M40: 4,944,808 km (0.068 R)
- M41: 5,229,044 km (0.11 R)
- M42: 5,338,250 km (0.075 R)
- M43: 5,916,147 km (0.069 R)
- M44: 6,050,785 km (0.083 R)
- M45: 6,144,583 km (0.073 R)
- M46: 6,217,886 km (0.117 R)
- M47: 6,291,488 km (0.045 R)
- M48: 6,546,104 km (0.051 R)
- M49: 6,631,674 km (0.089 R)
- M50: 6,869,085 km (0.044 R)
- M51: 7,296,786 km (0.08 R)
- M52: 7,374,577 km (0.073 R)
- M53: 7,519,537 km (0.103 R)
- M54: 7,598,076 km (0.101 R)
Planet 5 - Gas Giant
Semi-Major Axis: 2.97 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 610.5
Radius: 8.5
Gravity: 8.45 G
Time & Orbit
Eccentricity (e): 0.239
Orbit Range: 2.26 AU - 3.68 AU
Year: 3598 Days
Day: 5.6 Hours
Environment
Temp: -214 °C
Axial Tilt: 36.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (76)
Outer Limit: 26,910,503 km
- M1: 136,284 km (0.101 R)
- M2: 203,154 km (0.103 R)
- M3: 271,071 km (0.111 R)
- M4: 350,059 km (0.056 R)
- M5: 499,507 km (0.095 R)
- M6: 621,430 km (0.049 R)
- M7: 796,609 km (0.05 R)
- M8: 941,569 km (0.06 R)
- M9: 999,763 km (0.106 R)
- M10: 1,219,671 km (0.114 R)
- M11: 1,309,430 km (0.074 R)
- M12: 1,536,969 km (0.081 R)
- M13: 1,762,712 km (0.109 R)
- M14: 2,014,335 km (0.107 R)
- M15: 2,293,335 km (0.118 R)
- M16: 3,256,596 km (0.103 R)
- M17: 3,346,504 km (0.112 R)
- M18: 3,733,364 km (0.098 R)
- M19: 4,076,243 km (0.09 R)
- M20: 4,529,225 km (0.068 R)
- M21: 4,629,755 km (0.109 R)
- M22: 5,102,185 km (0.086 R)
- M23: 5,185,960 km (0.095 R)
- M24: 5,333,613 km (0.112 R)
- M25: 5,546,939 km (0.105 R)
- M26: 6,070,532 km (0.106 R)
- M27: 6,226,114 km (0.071 R)
- M28: 6,383,192 km (0.096 R)
- M29: 6,450,959 km (0.102 R)
- M30: 6,655,460 km (0.055 R)
- M31: 6,770,052 km (0.098 R)
- M32: 7,830,401 km (0.066 R)
- M33: 8,466,491 km (0.093 R)
- M34: 8,640,623 km (0.08 R)
- M35: 8,765,687 km (0.052 R)
- M36: 9,119,187 km (0.116 R)
- M37: 9,580,397 km (0.11 R)
- M38: 10,339,606 km (0.101 R)
- M39: 10,472,449 km (0.119 R)
- M40: 10,739,781 km (0.117 R)
- M41: 10,901,346 km (0.084 R)
- M42: 11,226,871 km (0.056 R)
- M43: 11,281,475 km (0.114 R)
- M44: 11,418,207 km (0.098 R)
- M45: 11,610,590 km (0.108 R)
- M46: 11,721,143 km (0.079 R)
- M47: 12,166,346 km (0.114 R)
- M48: 13,738,919 km (0.119 R)
- M49: 14,090,474 km (0.042 R)
- M50: 14,296,919 km (0.039 R)
- M51: 14,593,571 km (0.119 R)
- M52: 14,922,388 km (0.081 R)
- M53: 15,072,584 km (0.098 R)
- M54: 15,132,722 km (0.032 R)
- M55: 15,374,472 km (0.12 R)
- M56: 15,435,060 km (0.091 R)
- M57: 15,770,009 km (0.096 R)
- M58: 15,923,048 km (0.112 R)
- M59: 16,446,940 km (0.093 R)
- M60: 16,913,984 km (0.119 R)
- M61: 18,116,601 km (0.105 R)
- M62: 18,695,844 km (0.117 R)
- M63: 18,825,396 km (0.102 R)
- M64: 19,412,119 km (0.093 R)
- M65: 19,477,643 km (0.074 R)
- M66: 20,137,220 km (0.075 R)
- M67: 20,303,273 km (0.066 R)
- M68: 20,403,205 km (0.116 R)
- M69: 21,342,979 km (0.112 R)
- M70: 21,580,091 km (0.09 R)
- M71: 21,818,101 km (0.089 R)
- M72: 21,920,426 km (0.063 R)
- M73: 22,125,525 km (0.114 R)
- M74: 22,262,557 km (0.104 R)
- M75: 22,709,854 km (0.09 R)
- M76: 22,986,760 km (0.064 R)
Planet 6 - Gas Giant
Semi-Major Axis: 4.1 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 185.7
Radius: 11.5
Gravity: 1.4 G
Time & Orbit
Eccentricity (e): 0.142
Orbit Range: 3.52 AU - 4.68 AU
Year: 5836 Days
Day: 9.6 Hours
Environment
Temp: -221 °C
Axial Tilt: 25.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (72)
Outer Limit: 26,910,503 km
- M1: 143,764 km (0.115 R)
- M2: 271,969 km (0.087 R)
- M3: 390,899 km (0.084 R)
- M4: 558,748 km (0.071 R)
- M5: 704,756 km (0.118 R)
- M6: 793,168 km (0.048 R)
- M7: 1,037,611 km (0.053 R)
- M8: 1,210,546 km (0.026 R)
- M9: 1,294,620 km (0.1 R)
- M10: 1,469,051 km (0.112 R)
- M11: 1,611,767 km (0.095 R)
- M12: 1,772,884 km (0.09 R)
- M13: 2,096,764 km (0.044 R)
- M14: 2,228,859 km (0.05 R)
- M15: 2,348,537 km (0.078 R)
- M16: 2,470,459 km (0.054 R)
- M17: 2,579,067 km (0.09 R)
- M18: 3,195,859 km (0.115 R)
- M19: 3,417,264 km (0.055 R)
- M20: 3,821,627 km (0.048 R)
- M21: 4,222,699 km (0.087 R)
- M22: 4,390,698 km (0.088 R)
- M23: 5,065,234 km (0.101 R)
- M24: 5,648,666 km (0.112 R)
- M25: 5,792,729 km (0.08 R)
- M26: 6,000,670 km (0.114 R)
- M27: 6,338,611 km (0.09 R)
- M28: 6,596,219 km (0.072 R)
- M29: 6,704,528 km (0.045 R)
- M30: 7,033,045 km (0.054 R)
- M31: 7,322,068 km (0.09 R)
- M32: 7,456,855 km (0.093 R)
- M33: 7,547,213 km (0.11 R)
- M34: 7,866,155 km (0.061 R)
- M35: 8,004,084 km (0.081 R)
- M36: 8,282,636 km (0.037 R)
- M37: 8,611,751 km (0.067 R)
- M38: 8,825,526 km (0.113 R)
- M39: 9,017,012 km (0.113 R)
- M40: 9,089,118 km (0.082 R)
- M41: 9,209,843 km (0.065 R)
- M42: 9,920,732 km (0.036 R)
- M43: 10,219,928 km (0.108 R)
- M44: 10,370,723 km (0.115 R)
- M45: 10,623,693 km (0.074 R)
- M46: 11,032,693 km (0.07 R)
- M47: 11,368,840 km (0.071 R)
- M48: 11,472,810 km (0.108 R)
- M49: 11,551,200 km (0.072 R)
- M50: 11,998,198 km (0.044 R)
- M51: 12,746,786 km (0.083 R)
- M52: 13,290,724 km (0.094 R)
- M53: 13,703,763 km (0.042 R)
- M54: 13,786,940 km (0.108 R)
- M55: 13,925,767 km (0.113 R)
- M56: 14,120,992 km (0.07 R)
- M57: 14,289,140 km (0.048 R)
- M58: 15,196,750 km (0.083 R)
- M59: 15,628,639 km (0.063 R)
- M60: 15,889,687 km (0.097 R)
- M61: 16,006,075 km (0.106 R)
- M62: 16,181,403 km (0.061 R)
- M63: 16,918,622 km (0.099 R)
- M64: 17,486,196 km (0.063 R)
- M65: 18,609,526 km (0.102 R)
- M66: 19,164,385 km (0.097 R)
- M67: 20,006,920 km (0.101 R)
- M68: 20,258,992 km (0.063 R)
- M69: 20,575,392 km (0.053 R)
- M70: 21,053,208 km (0.052 R)
- M71: 21,277,305 km (0.094 R)
- M72: 21,631,254 km (0.119 R)
Planet 7 - Ice Giant
Semi-Major Axis: 6.46 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 91
Radius: 4.4
Gravity: 4.7 G
Time & Orbit
Eccentricity (e): 0.15
Orbit Range: 5.49 AU - 7.43 AU
Year: 11541 Days
Day: 17.1 Hours
Environment
Temp: -229 °C
Axial Tilt: 0.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (67)
Outer Limit: 26,910,503 km
- M1: 85,720 km (0.1 R)
- M2: 130,749 km (0.063 R)
- M3: 354,996 km (0.105 R)
- M4: 562,787 km (0.071 R)
- M5: 853,605 km (0.105 R)
- M6: 1,007,841 km (0.113 R)
- M7: 1,401,582 km (0.102 R)
- M8: 1,461,571 km (0.057 R)
- M9: 1,677,740 km (0.025 R)
- M10: 1,953,748 km (0.095 R)
- M11: 2,788,205 km (0.093 R)
- M12: 3,311,498 km (0.115 R)
- M13: 3,431,925 km (0.108 R)
- M14: 3,864,412 km (0.081 R)
- M15: 3,969,879 km (0.078 R)
- M16: 4,292,262 km (0.118 R)
- M17: 4,357,786 km (0.115 R)
- M18: 5,687,262 km (0.072 R)
- M19: 5,759,219 km (0.106 R)
- M20: 6,747,163 km (0.111 R)
- M21: 7,156,762 km (0.065 R)
- M22: 7,653,726 km (0.071 R)
- M23: 7,733,163 km (0.098 R)
- M24: 8,026,973 km (0.094 R)
- M25: 8,433,430 km (0.07 R)
- M26: 8,763,443 km (0.092 R)
- M27: 8,818,794 km (0.099 R)
- M28: 8,902,120 km (0.095 R)
- M29: 9,379,338 km (0.083 R)
- M30: 9,635,300 km (0.12 R)
- M31: 10,593,324 km (0.086 R)
- M32: 10,800,517 km (0.055 R)
- M33: 11,948,083 km (0.115 R)
- M34: 11,978,750 km (0.068 R)
- M35: 12,225,437 km (0.07 R)
- M36: 12,567,418 km (0.092 R)
- M37: 12,629,950 km (0.102 R)
- M38: 12,661,216 km (0.104 R)
- M39: 12,975,521 km (0.105 R)
- M40: 13,933,994 km (0.065 R)
- M41: 13,966,308 km (0.06 R)
- M42: 14,389,071 km (0.045 R)
- M43: 14,487,207 km (0.071 R)
- M44: 15,347,096 km (0.096 R)
- M45: 15,783,174 km (0.067 R)
- M46: 15,816,833 km (0.054 R)
- M47: 15,951,920 km (0.095 R)
- M48: 16,633,189 km (0.039 R)
- M49: 17,011,971 km (0.106 R)
- M50: 17,428,302 km (0.059 R)
- M51: 17,533,020 km (0.113 R)
- M52: 18,094,461 km (0.098 R)
- M53: 18,412,955 km (0.099 R)
- M54: 18,661,886 km (0.115 R)
- M55: 18,947,767 km (0.106 R)
- M56: 20,545,921 km (0.04 R)
- M57: 20,619,523 km (0.105 R)
- M58: 22,793,779 km (0.035 R)
- M59: 24,218,250 km (0.071 R)
- M60: 24,296,190 km (0.083 R)
- M61: 24,686,491 km (0.092 R)
- M62: 24,843,270 km (0.068 R)
- M63: 25,118,230 km (0.08 R)
- M64: 25,631,800 km (0.054 R)
- M65: 26,188,603 km (0.087 R)
- M66: 26,588,927 km (0.109 R)
- M67: 26,910,563 km (0.117 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: 160 - 16,784 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.