Star System Generated (Seed: 1768670509)
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 (6 Planets)
Planet 1 - Gas Giant
Semi-Major Axis: 1.34 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 637.2
Radius: 10.5
Gravity: 5.78 G
Time & Orbit
Eccentricity (e): 0.071
Orbit Range: 1.24 AU - 1.44 AU
Year: 1090 Days
Day: 8.9 Hours
Environment
Temp: -186 °C
Axial Tilt: 5.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (61)
Outer Limit: 74,160,845 km
- M1: 321,785 km (0.106 R)
- M2: 425,008 km (0.071 R)
- M3: 515,365 km (0.07 R)
- M4: 642,224 km (0.027 R)
- M5: 902,823 km (0.102 R)
- M6: 1,018,014 km (0.083 R)
- M7: 1,316,910 km (0.072 R)
- M8: 1,433,297 km (0.119 R)
- M9: 1,577,809 km (0.083 R)
- M10: 1,735,485 km (0.106 R)
- M11: 1,829,283 km (0.037 R)
- M12: 2,121,148 km (0.083 R)
- M13: 2,268,203 km (0.09 R)
- M14: 2,437,697 km (0.119 R)
- M15: 2,553,037 km (0.083 R)
- M16: 2,769,206 km (0.052 R)
- M17: 3,136,170 km (0.114 R)
- M18: 3,230,416 km (0.111 R)
- M19: 3,572,996 km (0.07 R)
- M20: 3,704,492 km (0.079 R)
- M21: 3,781,984 km (0.047 R)
- M22: 4,097,486 km (0.083 R)
- M23: 4,212,227 km (0.092 R)
- M24: 4,293,160 km (0.08 R)
- M25: 4,421,515 km (0.101 R)
- M26: 4,492,125 km (0.086 R)
- M27: 4,753,921 km (0.098 R)
- M28: 4,911,148 km (0.11 R)
- M29: 5,082,288 km (0.11 R)
- M30: 5,193,290 km (0.113 R)
- M31: 5,380,287 km (0.099 R)
- M32: 5,468,251 km (0.09 R)
- M33: 5,582,245 km (0.047 R)
- M34: 5,696,837 km (0.089 R)
- M35: 5,799,461 km (0.117 R)
- M36: 5,902,683 km (0.064 R)
- M37: 5,980,474 km (0.056 R)
- M38: 6,058,714 km (0.114 R)
- M39: 6,176,597 km (0.064 R)
- M40: 6,388,128 km (0.109 R)
- M41: 6,508,106 km (0.118 R)
- M42: 6,628,981 km (0.066 R)
- M43: 6,900,052 km (0.048 R)
- M44: 7,105,749 km (0.093 R)
- M45: 7,355,428 km (0.077 R)
- M46: 7,495,302 km (0.112 R)
- M47: 7,721,045 km (0.109 R)
- M48: 8,035,051 km (0.084 R)
- M49: 8,107,157 km (0.096 R)
- M50: 8,208,286 km (0.05 R)
- M51: 8,295,202 km (0.082 R)
- M52: 8,367,906 km (0.079 R)
- M53: 8,514,064 km (0.101 R)
- M54: 8,808,921 km (0.105 R)
- M55: 9,317,853 km (0.073 R)
- M56: 9,545,541 km (0.079 R)
- M57: 9,867,176 km (0.114 R)
- M58: 9,959,777 km (0.109 R)
- M59: 10,364,290 km (0.09 R)
- M60: 10,474,245 km (0.098 R)
- M61: 10,584,349 km (0.106 R)
Planet 2 - Gas Giant
Semi-Major Axis: 3.64 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 99
Radius: 8.9
Gravity: 1.25 G
Time & Orbit
Eccentricity (e): 0.041
Orbit Range: 3.49 AU - 3.79 AU
Year: 4882 Days
Day: 14.1 Hours
Environment
Temp: -213 °C
Axial Tilt: 6.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (36)
Outer Limit: 74,160,845 km
- M1: 216,468 km (0.099 R)
- M2: 403,615 km (0.082 R)
- M3: 514,916 km (0.07 R)
- M4: 660,325 km (0.104 R)
- M5: 786,735 km (0.093 R)
- M6: 861,684 km (0.079 R)
- M7: 1,495,680 km (0.045 R)
- M8: 2,979,541 km (0.104 R)
- M9: 3,372,086 km (0.052 R)
- M10: 3,983,941 km (0.07 R)
- M11: 4,057,393 km (0.115 R)
- M12: 4,175,725 km (0.096 R)
- M13: 4,295,404 km (0.101 R)
- M14: 4,415,980 km (0.038 R)
- M15: 4,645,463 km (0.106 R)
- M16: 4,847,420 km (0.11 R)
- M17: 5,036,512 km (0.115 R)
- M18: 5,519,713 km (0.067 R)
- M19: 5,933,800 km (0.091 R)
- M20: 6,512,893 km (0.088 R)
- M21: 8,187,791 km (0.082 R)
- M22: 8,793,512 km (0.032 R)
- M23: 9,257,116 km (0.108 R)
- M24: 9,452,790 km (0.069 R)
- M25: 10,127,925 km (0.079 R)
- M26: 10,613,819 km (0.116 R)
- M27: 11,692,719 km (0.059 R)
- M28: 11,946,736 km (0.043 R)
- M29: 12,288,119 km (0.099 R)
- M30: 12,632,792 km (0.101 R)
- M31: 13,441,817 km (0.058 R)
- M32: 14,675,402 km (0.119 R)
- M33: 14,789,395 km (0.093 R)
- M34: 14,880,650 km (0.098 R)
- M35: 14,972,204 km (0.102 R)
- M36: 15,386,590 km (0.043 R)
Planet 3 - Gas Giant
Semi-Major Axis: 4.06 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 193
Radius: 14.4
Gravity: 0.93 G
Time & Orbit
Eccentricity (e): 0.12
Orbit Range: 3.57 AU - 4.55 AU
Year: 5750 Days
Day: 6.3 Hours
Environment
Temp: -228 °C
Axial Tilt: 39.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (57)
Outer Limit: 74,160,845 km
- M1: 197,469 km (0.047 R)
- M2: 351,555 km (0.06 R)
- M3: 569,669 km (0.101 R)
- M4: 685,158 km (0.116 R)
- M5: 820,096 km (0.036 R)
- M6: 912,248 km (0.075 R)
- M7: 1,097,450 km (0.116 R)
- M8: 1,332,319 km (0.114 R)
- M9: 1,532,481 km (0.092 R)
- M10: 1,716,336 km (0.052 R)
- M11: 2,006,257 km (0.089 R)
- M12: 2,208,663 km (0.095 R)
- M13: 2,312,484 km (0.091 R)
- M14: 2,744,672 km (0.057 R)
- M15: 3,169,081 km (0.059 R)
- M16: 3,320,923 km (0.1 R)
- M17: 3,440,751 km (0.04 R)
- M18: 3,562,075 km (0.101 R)
- M19: 4,098,533 km (0.111 R)
- M20: 4,508,281 km (0.111 R)
- M21: 4,641,424 km (0.118 R)
- M22: 4,737,316 km (0.118 R)
- M23: 5,733,488 km (0.07 R)
- M24: 5,919,737 km (0.111 R)
- M25: 6,107,931 km (0.119 R)
- M26: 6,340,706 km (0.106 R)
- M27: 6,576,472 km (0.048 R)
- M28: 7,323,414 km (0.028 R)
- M29: 7,458,052 km (0.095 R)
- M30: 7,661,655 km (0.111 R)
- M31: 8,683,259 km (0.051 R)
- M32: 8,945,354 km (0.092 R)
- M33: 9,186,057 km (0.078 R)
- M34: 9,502,008 km (0.055 R)
- M35: 9,698,280 km (0.064 R)
- M36: 10,169,813 km (0.096 R)
- M37: 10,345,590 km (0.1 R)
- M38: 10,981,082 km (0.1 R)
- M39: 11,655,469 km (0.071 R)
- M40: 12,156,921 km (0.102 R)
- M41: 12,908,800 km (0.057 R)
- M42: 13,427,606 km (0.077 R)
- M43: 14,485,711 km (0.109 R)
- M44: 14,683,480 km (0.094 R)
- M45: 15,889,538 km (0.12 R)
- M46: 16,064,418 km (0.081 R)
- M47: 16,711,129 km (0.083 R)
- M48: 17,037,701 km (0.084 R)
- M49: 17,456,426 km (0.116 R)
- M50: 17,667,060 km (0.057 R)
- M51: 18,090,871 km (0.12 R)
- M52: 18,212,494 km (0.109 R)
- M53: 18,702,127 km (0.068 R)
- M54: 19,382,349 km (0.109 R)
- M55: 19,662,995 km (0.032 R)
- M56: 21,439,469 km (0.092 R)
- M57: 21,600,586 km (0.112 R)
Planet 4 - Ice Giant
Semi-Major Axis: 6.8 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 785.5
Radius: 4.7
Gravity: 35.56 G
Time & Orbit
Eccentricity (e): 0.105
Orbit Range: 6.09 AU - 7.51 AU
Year: 12464 Days
Day: 22.3 Hours
Environment
Temp: -219 °C
Axial Tilt: 32.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (95)
Outer Limit: 74,160,845 km
- M1: 116,537 km (0.087 R)
- M2: 471,532 km (0.088 R)
- M3: 631,153 km (0.108 R)
- M4: 707,448 km (0.117 R)
- M5: 807,230 km (0.071 R)
- M6: 869,313 km (0.084 R)
- M7: 1,731,446 km (0.108 R)
- M8: 1,921,734 km (0.076 R)
- M9: 2,090,181 km (0.091 R)
- M10: 2,411,368 km (0.118 R)
- M11: 2,441,437 km (0.054 R)
- M12: 2,501,725 km (0.119 R)
- M13: 2,562,612 km (0.068 R)
- M14: 3,363,559 km (0.091 R)
- M15: 3,773,606 km (0.103 R)
- M16: 3,843,468 km (0.086 R)
- M17: 4,454,576 km (0.086 R)
- M18: 4,790,273 km (0.089 R)
- M19: 5,684,719 km (0.064 R)
- M20: 5,764,904 km (0.111 R)
- M21: 6,171,361 km (0.104 R)
- M22: 6,212,650 km (0.067 R)
- M23: 6,840,961 km (0.078 R)
- M24: 7,227,672 km (0.026 R)
- M25: 7,843,267 km (0.063 R)
- M26: 7,887,847 km (0.109 R)
- M27: 8,202,451 km (0.096 R)
- M28: 8,567,171 km (0.086 R)
- M29: 8,613,097 km (0.099 R)
- M30: 8,844,077 km (0.096 R)
- M31: 9,692,446 km (0.11 R)
- M32: 9,981,020 km (0.086 R)
- M33: 10,174,899 km (0.078 R)
- M34: 10,370,124 km (0.078 R)
- M35: 10,863,349 km (0.103 R)
- M36: 12,492,769 km (0.083 R)
- M37: 12,859,134 km (0.12 R)
- M38: 13,017,408 km (0.032 R)
- M39: 13,335,603 km (0.105 R)
- M40: 13,656,341 km (0.087 R)
- M41: 14,578,911 km (0.112 R)
- M42: 14,688,865 km (0.105 R)
- M43: 14,854,171 km (0.078 R)
- M44: 15,633,725 km (0.067 R)
- M45: 16,483,741 km (0.083 R)
- M46: 16,885,411 km (0.112 R)
- M47: 18,583,945 km (0.044 R)
- M48: 18,643,485 km (0.077 R)
- M49: 19,002,071 km (0.054 R)
- M50: 19,969,371 km (0.076 R)
- M51: 21,076,395 km (0.037 R)
- M52: 21,200,711 km (0.108 R)
- M53: 22,203,466 km (0.062 R)
- M54: 22,393,156 km (0.074 R)
- M55: 22,837,910 km (0.094 R)
- M56: 24,580,576 km (0.119 R)
- M57: 25,633,296 km (0.039 R)
- M58: 25,898,832 km (0.082 R)
- M59: 26,098,545 km (0.098 R)
- M60: 26,165,266 km (0.097 R)
- M61: 26,365,578 km (0.107 R)
- M62: 26,700,677 km (0.091 R)
- M63: 27,172,209 km (0.119 R)
- M64: 27,850,636 km (0.109 R)
- M65: 30,128,562 km (0.112 R)
- M66: 30,478,921 km (0.091 R)
- M67: 30,549,232 km (0.036 R)
- M68: 32,250,758 km (0.049 R)
- M69: 32,465,580 km (0.082 R)
- M70: 34,201,514 km (0.087 R)
- M71: 35,670,864 km (0.11 R)
- M72: 35,967,218 km (0.114 R)
- M73: 36,562,468 km (0.109 R)
- M74: 38,519,058 km (0.105 R)
- M75: 39,510,144 km (0.073 R)
- M76: 40,896,168 km (0.051 R)
- M77: 41,907,001 km (0.097 R)
- M78: 41,985,091 km (0.071 R)
- M79: 42,768,685 km (0.061 R)
- M80: 43,557,215 km (0.057 R)
- M81: 44,032,637 km (0.08 R)
- M82: 45,148,488 km (0.032 R)
- M83: 45,469,076 km (0.116 R)
- M84: 45,951,380 km (0.092 R)
- M85: 47,652,457 km (0.045 R)
- M86: 47,897,199 km (0.11 R)
- M87: 49,456,607 km (0.055 R)
- M88: 49,704,341 km (0.115 R)
- M89: 49,869,797 km (0.069 R)
- M90: 50,450,087 km (0.099 R)
- M91: 51,282,898 km (0.056 R)
- M92: 51,617,399 km (0.102 R)
- M93: 53,046,807 km (0.111 R)
- M94: 56,030,386 km (0.11 R)
- M95: 57,846,654 km (0.048 R)
Asteroid Belt
Center: 7.37 AU
Composition
Type: Outer System (Icy)
A dense region of planetesimals and debris.
Boundary
Planet 5 - Ice Giant
Semi-Major Axis: 7.94 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 244.8
Radius: 6
Gravity: 6.8 G
Time & Orbit
Eccentricity (e): 0.148
Orbit Range: 6.76 AU - 9.12 AU
Year: 15727 Days
Day: 20.2 Hours
Environment
Temp: -237 °C
Axial Tilt: 25.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (78)
Outer Limit: 74,160,845 km
- M1: 95,892 km (0.101 R)
- M2: 194,926 km (0.093 R)
- M3: 603,627 km (0.115 R)
- M4: 1,133,353 km (0.117 R)
- M5: 1,356,254 km (0.116 R)
- M6: 1,570,778 km (0.096 R)
- M7: 2,429,021 km (0.117 R)
- M8: 2,877,216 km (0.117 R)
- M9: 3,908,244 km (0.055 R)
- M10: 4,151,640 km (0.061 R)
- M11: 4,846,073 km (0.056 R)
- M12: 4,943,611 km (0.056 R)
- M13: 6,023,259 km (0.08 R)
- M14: 6,806,404 km (0.068 R)
- M15: 7,246,970 km (0.05 R)
- M16: 7,395,820 km (0.11 R)
- M17: 8,662,465 km (0.111 R)
- M18: 8,899,877 km (0.105 R)
- M19: 10,410,965 km (0.058 R)
- M20: 10,452,852 km (0.107 R)
- M21: 10,875,316 km (0.086 R)
- M22: 10,960,438 km (0.101 R)
- M23: 11,693,168 km (0.112 R)
- M24: 11,780,384 km (0.119 R)
- M25: 12,131,490 km (0.113 R)
- M26: 14,263,110 km (0.096 R)
- M27: 14,637,254 km (0.084 R)
- M28: 14,731,351 km (0.112 R)
- M29: 15,538,880 km (0.099 R)
- M30: 15,923,945 km (0.104 R)
- M31: 16,949,439 km (0.104 R)
- M32: 18,705,419 km (0.044 R)
- M33: 20,256,150 km (0.081 R)
- M34: 21,686,605 km (0.068 R)
- M35: 21,793,867 km (0.096 R)
- M36: 21,955,133 km (0.058 R)
- M37: 22,332,718 km (0.047 R)
- M38: 22,821,604 km (0.095 R)
- M39: 22,930,661 km (0.116 R)
- M40: 23,149,373 km (0.091 R)
- M41: 23,259,028 km (0.103 R)
- M42: 23,313,931 km (0.106 R)
- M43: 24,699,656 km (0.094 R)
- M44: 25,092,500 km (0.091 R)
- M45: 27,144,982 km (0.052 R)
- M46: 29,073,299 km (0.073 R)
- M47: 29,191,631 km (0.042 R)
- M48: 29,428,594 km (0.054 R)
- M49: 29,547,375 km (0.096 R)
- M50: 30,023,993 km (0.046 R)
- M51: 30,683,570 km (0.05 R)
- M52: 31,712,205 km (0.105 R)
- M53: 31,894,864 km (0.105 R)
- M54: 32,445,085 km (0.077 R)
- M55: 33,865,368 km (0.064 R)
- M56: 34,052,066 km (0.075 R)
- M57: 34,239,213 km (0.106 R)
- M58: 35,242,715 km (0.101 R)
- M59: 35,305,845 km (0.116 R)
- M60: 35,431,956 km (0.067 R)
- M61: 35,495,236 km (0.085 R)
- M62: 35,684,926 km (0.107 R)
- M63: 36,766,220 km (0.09 R)
- M64: 36,894,126 km (0.067 R)
- M65: 37,086,210 km (0.092 R)
- M66: 37,729,181 km (0.063 R)
- M67: 37,858,135 km (0.119 R)
- M68: 38,505,594 km (0.08 R)
- M69: 38,635,445 km (0.118 R)
- M70: 38,960,821 km (0.117 R)
- M71: 39,221,869 km (0.093 R)
- M72: 40,205,625 km (0.087 R)
- M73: 41,264,029 km (0.088 R)
- M74: 41,863,468 km (0.09 R)
- M75: 44,085,595 km (0.098 R)
- M76: 44,561,915 km (0.112 R)
- M77: 44,766,564 km (0.086 R)
- M78: 45,313,793 km (0.065 R)
Planet 6 - Ice Giant
Semi-Major Axis: 8.38 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 872.5
Radius: 7.8
Gravity: 14.34 G
Time & Orbit
Eccentricity (e): 0.07
Orbit Range: 7.79 AU - 8.97 AU
Year: 17052 Days
Day: 16.4 Hours
Environment
Temp: -224 °C
Axial Tilt: 33.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (96)
Outer Limit: 74,160,845 km
- M1: 444,006 km (0.11 R)
- M2: 520,900 km (0.094 R)
- M3: 1,618,200 km (0.065 R)
- M4: 2,509,654 km (0.051 R)
- M5: 2,581,012 km (0.039 R)
- M6: 2,689,321 km (0.11 R)
- M7: 2,873,027 km (0.117 R)
- M8: 3,409,485 km (0.093 R)
- M9: 4,485,991 km (0.103 R)
- M10: 4,660,422 km (0.119 R)
- M11: 4,881,528 km (0.114 R)
- M12: 5,565,639 km (0.095 R)
- M13: 5,800,209 km (0.113 R)
- M14: 5,942,626 km (0.112 R)
- M15: 6,182,581 km (0.111 R)
- M16: 6,327,990 km (0.104 R)
- M17: 6,376,759 km (0.111 R)
- M18: 7,687,535 km (0.092 R)
- M19: 7,844,015 km (0.054 R)
- M20: 7,949,032 km (0.073 R)
- M21: 8,107,307 km (0.043 R)
- M22: 8,319,886 km (0.098 R)
- M23: 8,696,423 km (0.114 R)
- M24: 8,859,635 km (0.118 R)
- M25: 10,029,490 km (0.092 R)
- M26: 10,894,615 km (0.055 R)
- M27: 11,129,334 km (0.107 R)
- M28: 11,188,275 km (0.089 R)
- M29: 11,306,457 km (0.119 R)
- M30: 12,024,378 km (0.085 R)
- M31: 13,066,476 km (0.066 R)
- M32: 16,161,507 km (0.115 R)
- M33: 17,997,073 km (0.08 R)
- M34: 18,763,612 km (0.089 R)
- M35: 18,974,545 km (0.095 R)
- M36: 20,328,555 km (0.114 R)
- M37: 20,472,917 km (0.112 R)
- M38: 20,689,984 km (0.103 R)
- M39: 20,835,243 km (0.08 R)
- M40: 22,305,641 km (0.078 R)
- M41: 22,603,789 km (0.11 R)
- M42: 24,343,314 km (0.092 R)
- M43: 25,267,978 km (0.096 R)
- M44: 25,656,633 km (0.073 R)
- M45: 26,125,623 km (0.098 R)
- M46: 26,676,292 km (0.049 R)
- M47: 27,310,438 km (0.087 R)
- M48: 30,389,461 km (0.114 R)
- M49: 32,221,586 km (0.111 R)
- M50: 32,390,033 km (0.108 R)
- M51: 32,981,394 km (0.084 R)
- M52: 33,321,131 km (0.06 R)
- M53: 34,003,746 km (0.041 R)
- M54: 35,469,655 km (0.113 R)
- M55: 37,751,322 km (0.051 R)
- M56: 37,928,895 km (0.094 R)
- M57: 38,730,889 km (0.095 R)
- M58: 39,268,693 km (0.087 R)
- M59: 39,899,398 km (0.044 R)
- M60: 39,989,755 km (0.111 R)
- M61: 41,811,109 km (0.075 R)
- M62: 41,994,665 km (0.099 R)
- M63: 43,009,537 km (0.119 R)
- M64: 45,063,067 km (0.068 R)
- M65: 45,345,658 km (0.05 R)
- M66: 46,481,554 km (0.068 R)
- M67: 46,766,987 km (0.116 R)
- M68: 47,435,241 km (0.105 R)
- M69: 48,974,603 km (0.109 R)
- M70: 50,237,359 km (0.112 R)
- M71: 50,530,271 km (0.062 R)
- M72: 53,192,216 km (0.109 R)
- M73: 54,891,348 km (0.064 R)
- M74: 55,092,557 km (0.093 R)
- M75: 55,394,596 km (0.074 R)
- M76: 55,596,253 km (0.108 R)
- M77: 56,405,428 km (0.064 R)
- M78: 56,506,856 km (0.113 R)
- M79: 56,608,433 km (0.1 R)
- M80: 58,548,119 km (0.05 R)
- M81: 59,165,210 km (0.089 R)
- M82: 59,577,801 km (0.119 R)
- M83: 61,237,739 km (0.083 R)
- M84: 63,333,755 km (0.099 R)
- M85: 63,439,221 km (0.071 R)
- M86: 66,307,760 km (0.105 R)
- M87: 67,273,265 km (0.079 R)
- M88: 67,596,097 km (0.102 R)
- M89: 67,811,668 km (0.113 R)
- M90: 69,218,187 km (0.068 R)
- M91: 69,326,795 km (0.118 R)
- M92: 69,544,161 km (0.03 R)
- M93: 71,400,820 km (0.106 R)
- M94: 71,510,625 km (0.109 R)
- M95: 71,950,143 km (0.103 R)
- M96: 74,160,900 km (0.097 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: 525 - 14,819 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.