Star System Generated (Seed: 1766604898)
Star Details
Spectral Class: M0V
Temperature: 3,700 K
Mass: 0.33 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: 11.5 AU
Planetary System (7 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 0.53 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 4.37
Radius: 1.8
Gravity: 1.35 G
Time & Orbit
Eccentricity (e): 0.016
Orbit Range: 0.52 AU - 0.54 AU
Year: 245 Days
Day: 29.2 Hours
Environment
Temp: -121 °C
Axial Tilt: 38.4 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Planet 2 - Gas Giant
Semi-Major Axis: 1.2 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 604.7
Radius: 10.6
Gravity: 5.38 G
Time & Orbit
Eccentricity (e): 0.157
Orbit Range: 1.01 AU - 1.39 AU
Year: 836 Days
Day: 9.3 Hours
Environment
Temp: -176 °C
Axial Tilt: 32.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (55)
Outer Limit: 30,687,426 km
- M1: 135,835 km (0.086 R)
- M2: 252,820 km (0.032 R)
- M3: 320,439 km (0.026 R)
- M4: 443,408 km (0.081 R)
- M5: 528,380 km (0.074 R)
- M6: 600,037 km (0.111 R)
- M7: 680,820 km (0.034 R)
- M8: 771,177 km (0.097 R)
- M9: 865,872 km (0.068 R)
- M10: 965,056 km (0.085 R)
- M11: 1,074,412 km (0.095 R)
- M12: 1,333,067 km (0.099 R)
- M13: 1,456,036 km (0.068 R)
- M14: 1,568,683 km (0.101 R)
- M15: 1,677,142 km (0.092 R)
- M16: 2,017,626 km (0.062 R)
- M17: 2,096,315 km (0.065 R)
- M18: 2,176,051 km (0.101 R)
- M19: 2,281,218 km (0.045 R)
- M20: 2,421,541 km (0.084 R)
- M21: 2,539,125 km (0.118 R)
- M22: 2,693,360 km (0.099 R)
- M23: 2,833,084 km (0.068 R)
- M24: 2,939,449 km (0.09 R)
- M25: 3,074,386 km (0.096 R)
- M26: 3,165,491 km (0.067 R)
- M27: 3,248,219 km (0.102 R)
- M28: 3,577,035 km (0.101 R)
- M29: 3,673,077 km (0.101 R)
- M30: 3,779,590 km (0.102 R)
- M31: 3,926,645 km (0.09 R)
- M32: 4,035,702 km (0.118 R)
- M33: 4,206,094 km (0.107 R)
- M34: 4,502,597 km (0.113 R)
- M35: 4,595,946 km (0.073 R)
- M36: 4,753,173 km (0.092 R)
- M37: 4,986,845 km (0.055 R)
- M38: 5,061,943 km (0.094 R)
- M39: 5,246,098 km (0.072 R)
- M40: 5,543,050 km (0.081 R)
- M41: 5,721,670 km (0.118 R)
- M42: 5,970,451 km (0.12 R)
- M43: 6,130,670 km (0.106 R)
- M44: 6,466,966 km (0.077 R)
- M45: 6,596,219 km (0.062 R)
- M46: 6,797,428 km (0.075 R)
- M47: 6,988,764 km (0.095 R)
- M48: 7,145,692 km (0.093 R)
- M49: 7,328,052 km (0.053 R)
- M50: 7,772,058 km (0.059 R)
- M51: 7,846,857 km (0.09 R)
- M52: 7,921,955 km (0.105 R)
- M53: 8,022,485 km (0.069 R)
- M54: 8,123,464 km (0.115 R)
- M55: 8,492,970 km (0.074 R)
Planet 3 - Gas Giant
Semi-Major Axis: 1.37 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 361.2
Radius: 14.6
Gravity: 1.69 G
Time & Orbit
Eccentricity (e): 0.059
Orbit Range: 1.29 AU - 1.45 AU
Year: 1020 Days
Day: 7.1 Hours
Environment
Temp: -164 °C
Axial Tilt: 35.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (49)
Outer Limit: 30,687,426 km
- M1: 181,761 km (0.058 R)
- M2: 276,756 km (0.12 R)
- M3: 375,790 km (0.079 R)
- M4: 504,145 km (0.112 R)
- M5: 610,210 km (0.053 R)
- M6: 701,016 km (0.117 R)
- M7: 839,543 km (0.087 R)
- M8: 954,734 km (0.119 R)
- M9: 1,046,587 km (0.065 R)
- M10: 1,227,750 km (0.074 R)
- M11: 1,361,191 km (0.025 R)
- M12: 1,547,291 km (0.116 R)
- M13: 1,671,607 km (0.063 R)
- M14: 1,842,896 km (0.077 R)
- M15: 2,057,868 km (0.074 R)
- M16: 2,157,052 km (0.118 R)
- M17: 2,321,011 km (0.091 R)
- M18: 2,513,394 km (0.103 R)
- M19: 2,736,444 km (0.109 R)
- M20: 2,854,776 km (0.059 R)
- M21: 3,009,460 km (0.064 R)
- M22: 3,363,409 km (0.106 R)
- M23: 3,463,191 km (0.111 R)
- M24: 3,582,420 km (0.078 R)
- M25: 3,721,696 km (0.045 R)
- M26: 4,053,953 km (0.084 R)
- M27: 4,179,765 km (0.086 R)
- M28: 4,287,325 km (0.051 R)
- M29: 4,385,910 km (0.076 R)
- M30: 4,535,359 km (0.106 R)
- M31: 4,818,847 km (0.066 R)
- M32: 4,973,082 km (0.088 R)
- M33: 5,307,732 km (0.072 R)
- M34: 5,520,760 km (0.079 R)
- M35: 5,999,473 km (0.073 R)
- M36: 6,121,246 km (0.118 R)
- M37: 6,221,476 km (0.083 R)
- M38: 6,367,185 km (0.119 R)
- M39: 6,468,911 km (0.098 R)
- M40: 6,662,341 km (0.101 R)
- M41: 6,834,678 km (0.114 R)
- M42: 6,973,505 km (0.098 R)
- M43: 7,514,899 km (0.107 R)
- M44: 7,610,343 km (0.098 R)
- M45: 7,706,385 km (0.083 R)
- M46: 7,826,961 km (0.102 R)
- M47: 8,008,872 km (0.111 R)
- M48: 8,167,745 km (0.109 R)
- M49: 8,278,297 km (0.07 R)
Planet 4 - Gas Giant
Semi-Major Axis: 1.53 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 940.7
Radius: 8.7
Gravity: 12.43 G
Time & Orbit
Eccentricity (e): 0.209
Orbit Range: 1.21 AU - 1.85 AU
Year: 1203 Days
Day: 6.5 Hours
Environment
Temp: -179 °C
Axial Tilt: 26.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (70)
Outer Limit: 30,687,426 km
- M1: 125,064 km (0.071 R)
- M2: 207,343 km (0.077 R)
- M3: 336,595 km (0.055 R)
- M4: 405,111 km (0.088 R)
- M5: 485,295 km (0.065 R)
- M6: 540,048 km (0.052 R)
- M7: 603,927 km (0.067 R)
- M8: 732,880 km (0.118 R)
- M9: 841,338 km (0.091 R)
- M10: 909,256 km (0.099 R)
- M11: 1,026,840 km (0.051 R)
- M12: 1,099,844 km (0.05 R)
- M13: 1,200,074 km (0.044 R)
- M14: 1,320,949 km (0.093 R)
- M15: 1,400,984 km (0.114 R)
- M16: 1,650,813 km (0.036 R)
- M17: 1,766,452 km (0.099 R)
- M18: 2,067,443 km (0.035 R)
- M19: 2,309,342 km (0.109 R)
- M20: 2,549,447 km (0.05 R)
- M21: 2,797,480 km (0.068 R)
- M22: 2,924,638 km (0.065 R)
- M23: 3,029,955 km (0.033 R)
- M24: 3,101,014 km (0.086 R)
- M25: 3,329,450 km (0.091 R)
- M26: 3,501,338 km (0.103 R)
- M27: 3,625,953 km (0.091 R)
- M28: 3,726,633 km (0.032 R)
- M29: 3,802,778 km (0.109 R)
- M30: 4,217,912 km (0.067 R)
- M31: 4,323,977 km (0.116 R)
- M32: 4,457,717 km (0.055 R)
- M33: 4,538,799 km (0.108 R)
- M34: 4,688,397 km (0.11 R)
- M35: 4,826,027 km (0.085 R)
- M36: 5,260,908 km (0.057 R)
- M37: 5,403,924 km (0.112 R)
- M38: 5,870,071 km (0.064 R)
- M39: 6,018,472 km (0.03 R)
- M40: 6,228,358 km (0.071 R)
- M41: 6,562,859 km (0.06 R)
- M42: 6,794,436 km (0.09 R)
- M43: 6,872,227 km (0.073 R)
- M44: 7,217,948 km (0.094 R)
- M45: 7,361,113 km (0.104 R)
- M46: 7,424,991 km (0.073 R)
- M47: 7,812,300 km (0.09 R)
- M48: 7,942,899 km (0.112 R)
- M49: 8,289,068 km (0.049 R)
- M50: 8,355,639 km (0.051 R)
- M51: 8,673,984 km (0.062 R)
- M52: 9,098,991 km (0.088 R)
- M53: 9,219,118 km (0.085 R)
- M54: 9,391,754 km (0.075 R)
- M55: 9,495,874 km (0.116 R)
- M56: 9,687,809 km (0.077 R)
- M57: 9,969,202 km (0.119 R)
- M58: 10,217,684 km (0.094 R)
- M59: 10,324,796 km (0.111 R)
- M60: 10,432,208 km (0.069 R)
- M61: 10,666,328 km (0.066 R)
- M62: 10,902,244 km (0.106 R)
- M63: 10,956,997 km (0.095 R)
- M64: 11,638,864 km (0.101 R)
- M65: 11,919,360 km (0.113 R)
- M66: 12,277,647 km (0.103 R)
- M67: 12,524,932 km (0.037 R)
- M68: 12,620,525 km (0.099 R)
- M69: 12,735,416 km (0.1 R)
- M70: 12,831,608 km (0.063 R)
Planet 5 - Ice Giant
Semi-Major Axis: 7.89 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 528.4
Radius: 6.9
Gravity: 11.1 G
Time & Orbit
Eccentricity (e): 0.133
Orbit Range: 6.84 AU - 8.94 AU
Year: 14091 Days
Day: 17.9 Hours
Environment
Temp: -233 °C
Axial Tilt: 6.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (95)
Outer Limit: 30,687,426 km
- M1: 149,448 km (0.07 R)
- M2: 208,091 km (0.044 R)
- M3: 560,693 km (0.106 R)
- M4: 666,010 km (0.076 R)
- M5: 1,064,090 km (0.12 R)
- M6: 1,287,589 km (0.118 R)
- M7: 1,650,364 km (0.081 R)
- M8: 2,265,361 km (0.088 R)
- M9: 2,641,898 km (0.076 R)
- M10: 2,944,684 km (0.114 R)
- M11: 4,334,000 km (0.037 R)
- M12: 4,511,124 km (0.077 R)
- M13: 4,836,200 km (0.101 R)
- M14: 5,394,798 km (0.108 R)
- M15: 5,470,794 km (0.092 R)
- M16: 5,547,239 km (0.107 R)
- M17: 6,171,062 km (0.078 R)
- M18: 6,612,675 km (0.092 R)
- M19: 7,189,674 km (0.119 R)
- M20: 8,790,520 km (0.099 R)
- M21: 8,880,130 km (0.086 R)
- M22: 9,105,424 km (0.055 R)
- M23: 9,515,771 km (0.051 R)
- M24: 9,978,627 km (0.098 R)
- M25: 10,072,125 km (0.093 R)
- M26: 10,354,267 km (0.116 R)
- M27: 10,401,690 km (0.101 R)
- M28: 10,639,101 km (0.083 R)
- M29: 11,022,820 km (0.118 R)
- M30: 11,216,400 km (0.113 R)
- M31: 11,508,863 km (0.114 R)
- M32: 11,656,068 km (0.096 R)
- M33: 12,201,053 km (0.065 R)
- M34: 12,653,138 km (0.117 R)
- M35: 12,703,702 km (0.033 R)
- M36: 13,367,318 km (0.089 R)
- M37: 14,094,513 km (0.084 R)
- M38: 14,728,060 km (0.109 R)
- M39: 14,781,167 km (0.073 R)
- M40: 15,370,732 km (0.058 R)
- M41: 16,022,680 km (0.105 R)
- M42: 17,353,503 km (0.026 R)
- M43: 17,635,195 km (0.074 R)
- M44: 17,691,594 km (0.078 R)
- M45: 18,374,658 km (0.114 R)
- M46: 18,431,954 km (0.116 R)
- M47: 18,661,736 km (0.057 R)
- M48: 19,066,099 km (0.08 R)
- M49: 19,648,932 km (0.091 R)
- M50: 20,060,326 km (0.095 R)
- M51: 20,772,263 km (0.11 R)
- M52: 21,011,470 km (0.082 R)
- M53: 21,734,327 km (0.087 R)
- M54: 22,098,897 km (0.109 R)
- M55: 22,159,783 km (0.066 R)
- M56: 22,281,855 km (0.092 R)
- M57: 22,526,747 km (0.114 R)
- M58: 22,710,902 km (0.099 R)
- M59: 23,328,442 km (0.065 R)
- M60: 24,643,407 km (0.114 R)
- M61: 26,110,812 km (0.111 R)
- M62: 27,409,771 km (0.076 R)
- M63: 27,737,689 km (0.049 R)
- M64: 27,935,158 km (0.105 R)
- M65: 28,067,104 km (0.045 R)
- M66: 28,996,106 km (0.053 R)
- M67: 29,330,308 km (0.097 R)
- M68: 29,397,328 km (0.061 R)
- M69: 30,205,156 km (0.108 R)
- M70: 31,157,048 km (0.089 R)
- M71: 31,567,993 km (0.09 R)
- M72: 31,774,139 km (0.052 R)
- M73: 32,672,474 km (0.069 R)
- M74: 33,859,982 km (0.1 R)
- M75: 34,423,667 km (0.088 R)
- M76: 36,637,117 km (0.11 R)
- M77: 37,143,207 km (0.095 R)
- M78: 38,896,045 km (0.086 R)
- M79: 39,043,399 km (0.118 R)
- M80: 39,338,406 km (0.049 R)
- M81: 39,782,562 km (0.109 R)
- M82: 41,801,385 km (0.111 R)
- M83: 42,937,431 km (0.047 R)
- M84: 44,006,757 km (0.116 R)
- M85: 44,083,501 km (0.087 R)
- M86: 44,236,988 km (0.079 R)
- M87: 45,162,101 km (0.092 R)
- M88: 46,249,528 km (0.042 R)
- M89: 46,561,888 km (0.092 R)
- M90: 47,031,626 km (0.117 R)
- M91: 48,926,133 km (0.073 R)
- M92: 49,962,697 km (0.099 R)
- M93: 52,789,349 km (0.083 R)
- M94: 54,592,452 km (0.11 R)
- M95: 55,087,621 km (0.116 R)
Planet 6 - Ice Giant
Semi-Major Axis: 7.94 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 970.6
Radius: 7.8
Gravity: 15.95 G
Time & Orbit
Eccentricity (e): 0.086
Orbit Range: 7.26 AU - 8.62 AU
Year: 14225 Days
Day: 20 Hours
Environment
Temp: -221 °C
Axial Tilt: 23.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (92)
Outer Limit: 30,687,426 km
- M1: 186,399 km (0.078 R)
- M2: 303,983 km (0.094 R)
- M3: 365,767 km (0.105 R)
- M4: 561,441 km (0.069 R)
- M5: 950,246 km (0.072 R)
- M6: 1,046,886 km (0.067 R)
- M7: 1,302,848 km (0.095 R)
- M8: 1,356,404 km (0.051 R)
- M9: 2,088,087 km (0.084 R)
- M10: 2,377,709 km (0.081 R)
- M11: 2,853,280 km (0.073 R)
- M12: 3,621,016 km (0.043 R)
- M13: 4,449,041 km (0.087 R)
- M14: 4,613,150 km (0.034 R)
- M15: 5,117,893 km (0.094 R)
- M16: 5,203,612 km (0.109 R)
- M17: 5,333,314 km (0.089 R)
- M18: 5,684,270 km (0.114 R)
- M19: 5,773,131 km (0.09 R)
- M20: 5,997,528 km (0.116 R)
- M21: 6,133,513 km (0.115 R)
- M22: 6,316,471 km (0.096 R)
- M23: 6,454,849 km (0.034 R)
- M24: 6,547,600 km (0.044 R)
- M25: 9,060,096 km (0.118 R)
- M26: 9,903,379 km (0.099 R)
- M27: 10,280,066 km (0.119 R)
- M28: 10,497,582 km (0.106 R)
- M29: 11,103,304 km (0.118 R)
- M30: 11,777,092 km (0.114 R)
- M31: 12,812,310 km (0.098 R)
- M32: 13,046,430 km (0.088 R)
- M33: 13,637,641 km (0.05 R)
- M34: 13,936,538 km (0.118 R)
- M35: 14,177,241 km (0.119 R)
- M36: 14,601,650 km (0.117 R)
- M37: 14,662,686 km (0.078 R)
- M38: 14,723,722 km (0.099 R)
- M39: 15,525,417 km (0.105 R)
- M40: 16,722,349 km (0.08 R)
- M41: 18,804,602 km (0.078 R)
- M42: 20,555,645 km (0.115 R)
- M43: 21,104,819 km (0.105 R)
- M44: 21,589,366 km (0.073 R)
- M45: 21,798,055 km (0.09 R)
- M46: 23,064,850 km (0.045 R)
- M47: 23,135,909 km (0.12 R)
- M48: 23,492,401 km (0.039 R)
- M49: 23,707,074 km (0.084 R)
- M50: 23,994,451 km (0.102 R)
- M51: 24,210,620 km (0.08 R)
- M52: 24,427,537 km (0.059 R)
- M53: 26,260,111 km (0.052 R)
- M54: 26,483,012 km (0.098 R)
- M55: 27,606,791 km (0.041 R)
- M56: 27,757,885 km (0.117 R)
- M57: 28,136,517 km (0.067 R)
- M58: 28,212,513 km (0.055 R)
- M59: 29,978,217 km (0.085 R)
- M60: 31,858,512 km (0.076 R)
- M61: 31,937,799 km (0.115 R)
- M62: 32,653,176 km (0.095 R)
- M63: 32,733,061 km (0.065 R)
- M64: 34,749,790 km (0.103 R)
- M65: 36,474,654 km (0.084 R)
- M66: 36,557,531 km (0.047 R)
- M67: 36,723,435 km (0.12 R)
- M68: 38,817,655 km (0.06 R)
- M69: 45,328,304 km (0.064 R)
- M70: 45,684,946 km (0.11 R)
- M71: 47,030,579 km (0.101 R)
- M72: 47,391,558 km (0.112 R)
- M73: 47,844,241 km (0.112 R)
- M74: 50,959,467 km (0.116 R)
- M75: 52,074,570 km (0.064 R)
- M76: 52,541,615 km (0.082 R)
- M77: 53,197,751 km (0.028 R)
- M78: 54,139,769 km (0.066 R)
- M79: 54,518,102 km (0.068 R)
- M80: 55,849,373 km (0.089 R)
- M81: 56,040,410 km (0.11 R)
- M82: 57,191,266 km (0.107 R)
- M83: 57,383,798 km (0.118 R)
- M84: 57,769,462 km (0.082 R)
- M85: 58,737,659 km (0.081 R)
- M86: 59,126,464 km (0.047 R)
- M87: 60,004,304 km (0.099 R)
- M88: 61,083,204 km (0.059 R)
- M89: 63,160,520 km (0.106 R)
- M90: 65,965,929 km (0.105 R)
- M91: 66,572,399 km (0.084 R)
- M92: 67,689,147 km (0.07 R)
Planet 7 - Ice Giant
Semi-Major Axis: 8.65 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 68.7
Radius: 7.3
Gravity: 1.29 G
Time & Orbit
Eccentricity (e): 0.01
Orbit Range: 8.56 AU - 8.74 AU
Year: 16175 Days
Day: 19.7 Hours
Environment
Temp: -231 °C
Axial Tilt: 176.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (55)
Outer Limit: 30,687,426 km
- M1: 95,743 km (0.079 R)
- M2: 158,574 km (0.069 R)
- M3: 219,011 km (0.039 R)
- M4: 507,137 km (0.083 R)
- M5: 574,605 km (0.049 R)
- M6: 633,397 km (0.111 R)
- M7: 681,867 km (0.043 R)
- M8: 809,175 km (0.056 R)
- M9: 1,116,898 km (0.098 R)
- M10: 1,237,623 km (0.099 R)
- M11: 1,315,264 km (0.118 R)
- M12: 1,475,633 km (0.104 R)
- M13: 1,780,215 km (0.071 R)
- M14: 2,545,109 km (0.12 R)
- M15: 2,827,400 km (0.087 R)
- M16: 3,598,577 km (0.062 R)
- M17: 4,170,489 km (0.118 R)
- M18: 4,241,100 km (0.118 R)
- M19: 5,043,094 km (0.092 R)
- M20: 5,422,923 km (0.083 R)
- M21: 5,500,115 km (0.041 R)
- M22: 5,707,458 km (0.069 R)
- M23: 5,838,356 km (0.082 R)
- M24: 6,727,267 km (0.069 R)
- M25: 7,314,588 km (0.095 R)
- M26: 7,773,255 km (0.11 R)
- M27: 9,142,823 km (0.052 R)
- M28: 9,636,496 km (0.118 R)
- M29: 10,297,569 km (0.119 R)
- M30: 10,425,176 km (0.09 R)
- M31: 12,232,019 km (0.095 R)
- M32: 12,536,900 km (0.1 R)
- M33: 14,847,439 km (0.072 R)
- M34: 15,756,246 km (0.047 R)
- M35: 15,940,252 km (0.119 R)
- M36: 16,236,007 km (0.079 R)
- M37: 16,347,307 km (0.065 R)
- M38: 17,780,156 km (0.06 R)
- M39: 18,666,822 km (0.111 R)
- M40: 18,939,539 km (0.078 R)
- M41: 19,924,192 km (0.112 R)
- M42: 21,127,558 km (0.118 R)
- M43: 22,148,414 km (0.104 R)
- M44: 22,727,058 km (0.108 R)
- M45: 23,143,389 km (0.08 R)
- M46: 24,152,875 km (0.107 R)
- M47: 24,577,733 km (0.068 R)
- M48: 24,791,060 km (0.11 R)
- M49: 25,133,789 km (0.089 R)
- M50: 25,391,845 km (0.048 R)
- M51: 26,084,184 km (0.111 R)
- M52: 26,694,992 km (0.108 R)
- M53: 27,090,230 km (0.092 R)
- M54: 28,242,881 km (0.091 R)
- M55: 29,230,526 km (0.082 R)
Kuiper Belt
Range: 30 - 58 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 222 - 10,250 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.