G0V Star System Generated (Seed: 1768714197)
Star Details
Spectral Class: G0V
Temperature: 6,000 K
Mass: 1.1 sol
Luminosity: 1.4 lux
Habitable Zone (HZ)
Inner Boundary: 1.13 AU
Outer Boundary: 1.63 AU
Physical Limits
Snow Line: 5.68 AU
Max System Radius: 21 AU
Planetary System (8 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 0.57 AU
Status: Inner (Hot)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 3.7
Radius: 1.69
Gravity: 1.3 G
Time & Orbit
Eccentricity (e): 0.046
Orbit Range: 0.54 AU - 0.6 AU
Year: 150 Days
Day: 44.5 Hours
Environment
Temp: 252 °C
Axial Tilt: 6.2 °
Atmosphere: Dense COâ‚‚
Biome: Volcanic/Barren
Planet 2 - Terrestrial
Semi-Major Axis: 0.73 AU
Status: Inner (Hot)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 4.57
Radius: 1.84
Gravity: 1.35 G
Time & Orbit
Eccentricity (e): 0.145
Orbit Range: 0.62 AU - 0.84 AU
Year: 217 Days
Day: 31.7 Hours
Environment
Temp: 185 °C
Axial Tilt: 26.2 °
Atmosphere: Dense COâ‚‚
Biome: Volcanic/Barren
Satellites (1)
Outer Limit: 71,603,233 km
- M1: 260,899 km (0.063 R)
Planet 3 - Terrestrial
Semi-Major Axis: 1.3 AU
Status: HZ
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 3.09
Radius: 1.57
Gravity: 1.25 G
Time & Orbit
Eccentricity (e): 0.143
Orbit Range: 1.11 AU - 1.49 AU
Year: 516 Days
Day: 20.4 Hours
Environment
Temp: 3 °C
Axial Tilt: 15.9 °
Atmosphere: Nâ‚‚, Oâ‚‚
Biome: Arid/Tundra
Satellites (1)
Outer Limit: 71,603,233 km
- M1: 710,889 km (0.11 R)
Asteroid Belt
Center: 3.52 AU
Composition
Type: Inner (Rocky/Metallic)
A dense region of planetesimals and debris.
Boundary
Planet 4 - Gas Giant
Semi-Major Axis: 5.74 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 787.5
Radius: 8.7
Gravity: 10.4 G
Time & Orbit
Eccentricity (e): 0.184
Orbit Range: 4.68 AU - 6.8 AU
Year: 4789 Days
Day: 13.4 Hours
Environment
Temp: -142 °C
Axial Tilt: 7.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (79)
Outer Limit: 71,603,233 km
- M1: 111,002 km (0.073 R)
- M2: 353,201 km (0.104 R)
- M3: 762,650 km (0.039 R)
- M4: 962,961 km (0.119 R)
- M5: 1,150,258 km (0.108 R)
- M6: 1,256,173 km (0.063 R)
- M7: 1,712,596 km (0.114 R)
- M8: 1,959,283 km (0.114 R)
- M9: 2,312,185 km (0.103 R)
- M10: 2,604,948 km (0.037 R)
- M11: 2,664,936 km (0.088 R)
- M12: 3,013,649 km (0.103 R)
- M13: 3,076,779 km (0.106 R)
- M14: 3,552,949 km (0.093 R)
- M15: 3,642,110 km (0.099 R)
- M16: 4,122,020 km (0.056 R)
- M17: 4,743,748 km (0.102 R)
- M18: 4,990,735 km (0.059 R)
- M19: 5,115,948 km (0.085 R)
- M20: 5,242,059 km (0.08 R)
- M21: 5,394,798 km (0.109 R)
- M22: 5,600,645 km (0.107 R)
- M23: 5,704,616 km (0.091 R)
- M24: 5,993,938 km (0.068 R)
- M25: 6,073,524 km (0.064 R)
- M26: 6,314,825 km (0.114 R)
- M27: 7,141,802 km (0.117 R)
- M28: 7,339,571 km (0.051 R)
- M29: 7,740,792 km (0.111 R)
- M30: 8,504,639 km (0.07 R)
- M31: 8,624,317 km (0.05 R)
- M32: 9,384,873 km (0.078 R)
- M33: 9,820,203 km (0.115 R)
- M34: 10,293,979 km (0.099 R)
- M35: 10,485,464 km (0.114 R)
- M36: 10,549,642 km (0.071 R)
- M37: 11,100,012 km (0.11 R)
- M38: 11,362,108 km (0.096 R)
- M39: 11,460,992 km (0.097 R)
- M40: 11,692,869 km (0.1 R)
- M41: 11,926,241 km (0.105 R)
- M42: 12,533,310 km (0.037 R)
- M43: 13,150,550 km (0.109 R)
- M44: 13,532,623 km (0.119 R)
- M45: 13,707,354 km (0.115 R)
- M46: 14,952,457 km (0.076 R)
- M47: 15,024,713 km (0.107 R)
- M48: 15,606,648 km (0.118 R)
- M49: 15,974,210 km (0.101 R)
- M50: 16,419,114 km (0.032 R)
- M51: 16,605,663 km (0.063 R)
- M52: 16,717,861 km (0.08 R)
- M53: 18,703,773 km (0.045 R)
- M54: 19,172,463 km (0.095 R)
- M55: 19,408,379 km (0.114 R)
- M56: 19,566,055 km (0.09 R)
- M57: 19,645,192 km (0.109 R)
- M58: 19,724,330 km (0.105 R)
- M59: 20,081,869 km (0.103 R)
- M60: 20,481,594 km (0.071 R)
- M61: 20,561,779 km (0.114 R)
- M62: 21,167,052 km (0.083 R)
- M63: 21,614,798 km (0.119 R)
- M64: 21,942,268 km (0.03 R)
- M65: 22,065,536 km (0.039 R)
- M66: 23,478,189 km (0.108 R)
- M67: 23,772,747 km (0.106 R)
- M68: 24,026,166 km (0.063 R)
- M69: 24,153,175 km (0.099 R)
- M70: 24,663,603 km (0.116 R)
- M71: 25,306,574 km (0.102 R)
- M72: 26,434,093 km (0.073 R)
- M73: 26,652,805 km (0.104 R)
- M74: 27,533,638 km (0.1 R)
- M75: 27,755,342 km (0.101 R)
- M76: 28,603,262 km (0.096 R)
- M77: 29,143,161 km (0.085 R)
- M78: 30,004,845 km (0.086 R)
- M79: 30,187,354 km (0.06 R)
Planet 5 - Gas Giant
Semi-Major Axis: 8.13 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 846.6
Radius: 9.1
Gravity: 10.22 G
Time & Orbit
Eccentricity (e): 0.102
Orbit Range: 7.3 AU - 8.96 AU
Year: 8073 Days
Day: 13.9 Hours
Environment
Temp: -147 °C
Axial Tilt: 15.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (86)
Outer Limit: 71,603,233 km
- M1: 157,676 km (0.072 R)
- M2: 268,379 km (0.118 R)
- M3: 442,660 km (0.091 R)
- M4: 783,444 km (0.111 R)
- M5: 850,314 km (0.036 R)
- M6: 972,536 km (0.088 R)
- M7: 1,082,191 km (0.081 R)
- M8: 1,334,263 km (0.082 R)
- M9: 1,583,643 km (0.11 R)
- M10: 1,692,102 km (0.08 R)
- M11: 1,780,514 km (0.057 R)
- M12: 2,723,429 km (0.03 R)
- M13: 3,231,164 km (0.051 R)
- M14: 3,567,161 km (0.05 R)
- M15: 4,002,790 km (0.051 R)
- M16: 4,547,925 km (0.112 R)
- M17: 4,734,922 km (0.118 R)
- M18: 5,052,070 km (0.075 R)
- M19: 5,574,017 km (0.118 R)
- M20: 5,875,157 km (0.088 R)
- M21: 6,423,733 km (0.105 R)
- M22: 6,739,534 km (0.108 R)
- M23: 6,845,898 km (0.044 R)
- M24: 7,680,055 km (0.094 R)
- M25: 8,128,101 km (0.083 R)
- M26: 8,777,206 km (0.114 R)
- M27: 10,698,641 km (0.097 R)
- M28: 11,240,634 km (0.119 R)
- M29: 11,621,211 km (0.062 R)
- M30: 12,091,996 km (0.119 R)
- M31: 12,700,410 km (0.109 R)
- M32: 12,788,075 km (0.087 R)
- M33: 13,008,283 km (0.105 R)
- M34: 13,363,129 km (0.036 R)
- M35: 13,541,749 km (0.104 R)
- M36: 13,766,146 km (0.032 R)
- M37: 13,946,710 km (0.08 R)
- M38: 14,218,829 km (0.04 R)
- M39: 14,676,299 km (0.07 R)
- M40: 14,953,055 km (0.099 R)
- M41: 15,793,795 km (0.095 R)
- M42: 15,935,464 km (0.12 R)
- M43: 16,649,794 km (0.068 R)
- M44: 18,159,237 km (0.075 R)
- M45: 18,307,638 km (0.099 R)
- M46: 19,408,080 km (0.109 R)
- M47: 20,221,892 km (0.078 R)
- M48: 20,427,140 km (0.1 R)
- M49: 20,736,210 km (0.069 R)
- M50: 20,891,343 km (0.099 R)
- M51: 21,046,775 km (0.111 R)
- M52: 21,254,865 km (0.099 R)
- M53: 21,935,386 km (0.117 R)
- M54: 22,093,362 km (0.058 R)
- M55: 22,357,701 km (0.109 R)
- M56: 22,889,372 km (0.048 R)
- M57: 24,400,310 km (0.078 R)
- M58: 24,618,873 km (0.113 R)
- M59: 25,499,256 km (0.104 R)
- M60: 25,943,263 km (0.082 R)
- M61: 26,222,113 km (0.119 R)
- M62: 26,839,055 km (0.116 R)
- M63: 27,064,648 km (0.113 R)
- M64: 27,574,328 km (0.059 R)
- M65: 27,631,176 km (0.099 R)
- M66: 28,545,817 km (0.074 R)
- M67: 29,528,525 km (0.079 R)
- M68: 31,348,982 km (0.118 R)
- M69: 31,705,474 km (0.067 R)
- M70: 32,003,622 km (0.076 R)
- M71: 33,508,277 km (0.095 R)
- M72: 33,872,847 km (0.081 R)
- M73: 34,177,578 km (0.073 R)
- M74: 34,912,702 km (0.078 R)
- M75: 35,715,145 km (0.105 R)
- M76: 38,285,087 km (0.091 R)
- M77: 39,304,148 km (0.116 R)
- M78: 40,332,035 km (0.111 R)
- M79: 41,368,748 km (0.092 R)
- M80: 41,825,171 km (0.114 R)
- M81: 42,086,668 km (0.097 R)
- M82: 42,217,566 km (0.083 R)
- M83: 42,940,274 km (0.06 R)
- M84: 43,270,137 km (0.075 R)
- M85: 43,667,170 km (0.087 R)
- M86: 44,331,384 km (0.096 R)
Planet 6 - Gas Giant
Semi-Major Axis: 10.6 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 198.8
Radius: 14.2
Gravity: 0.99 G
Time & Orbit
Eccentricity (e): 0.228
Orbit Range: 8.18 AU - 13.02 AU
Year: 12019 Days
Day: 10.2 Hours
Environment
Temp: -173 °C
Axial Tilt: 19.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (55)
Outer Limit: 71,603,233 km
- M1: 179,817 km (0.109 R)
- M2: 352,901 km (0.041 R)
- M3: 714,330 km (0.04 R)
- M4: 1,076,955 km (0.109 R)
- M5: 1,172,698 km (0.114 R)
- M6: 1,514,678 km (0.118 R)
- M7: 2,127,282 km (0.119 R)
- M8: 2,634,718 km (0.117 R)
- M9: 2,994,052 km (0.067 R)
- M10: 3,393,478 km (0.091 R)
- M11: 4,011,916 km (0.103 R)
- M12: 4,827,523 km (0.097 R)
- M13: 5,018,709 km (0.097 R)
- M14: 5,184,763 km (0.101 R)
- M15: 5,809,185 km (0.082 R)
- M16: 6,851,732 km (0.096 R)
- M17: 7,410,331 km (0.03 R)
- M18: 7,504,876 km (0.112 R)
- M19: 7,855,085 km (0.111 R)
- M20: 8,178,067 km (0.088 R)
- M21: 9,513,826 km (0.091 R)
- M22: 10,666,328 km (0.052 R)
- M23: 10,809,045 km (0.115 R)
- M24: 11,313,638 km (0.068 R)
- M25: 11,789,060 km (0.062 R)
- M26: 11,936,713 km (0.087 R)
- M27: 12,345,863 km (0.109 R)
- M28: 13,292,818 km (0.054 R)
- M29: 13,446,605 km (0.112 R)
- M30: 13,794,569 km (0.083 R)
- M31: 17,100,084 km (0.095 R)
- M32: 17,393,146 km (0.064 R)
- M33: 17,519,257 km (0.105 R)
- M34: 19,143,142 km (0.099 R)
- M35: 19,491,256 km (0.105 R)
- M36: 19,797,483 km (0.095 R)
- M37: 20,061,224 km (0.092 R)
- M38: 21,532,669 km (0.113 R)
- M39: 21,849,218 km (0.068 R)
- M40: 22,258,667 km (0.113 R)
- M41: 22,854,366 km (0.11 R)
- M42: 24,437,261 km (0.068 R)
- M43: 24,578,631 km (0.082 R)
- M44: 24,720,300 km (0.074 R)
- M45: 24,862,269 km (0.068 R)
- M46: 25,194,376 km (0.099 R)
- M47: 26,247,994 km (0.089 R)
- M48: 26,441,124 km (0.114 R)
- M49: 26,731,793 km (0.061 R)
- M50: 28,003,076 km (0.113 R)
- M51: 28,348,796 km (0.094 R)
- M52: 33,543,882 km (0.064 R)
- M53: 33,805,977 km (0.072 R)
- M54: 34,121,479 km (0.068 R)
- M55: 34,385,071 km (0.105 R)
Planet 7 - Gas Giant
Semi-Major Axis: 11.04 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 963.1
Radius: 9.2
Gravity: 11.38 G
Time & Orbit
Eccentricity (e): 0.16
Orbit Range: 9.27 AU - 12.81 AU
Year: 12775 Days
Day: 9.1 Hours
Environment
Temp: -182 °C
Axial Tilt: 1.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (87)
Outer Limit: 71,603,233 km
- M1: 320,289 km (0.115 R)
- M2: 778,059 km (0.104 R)
- M3: 1,018,761 km (0.098 R)
- M4: 1,308,233 km (0.102 R)
- M5: 1,489,097 km (0.098 R)
- M6: 1,706,014 km (0.102 R)
- M7: 2,261,471 km (0.077 R)
- M8: 2,511,599 km (0.105 R)
- M9: 3,526,919 km (0.117 R)
- M10: 3,634,929 km (0.074 R)
- M11: 3,780,488 km (0.071 R)
- M12: 4,537,752 km (0.089 R)
- M13: 4,853,553 km (0.115 R)
- M14: 5,095,154 km (0.063 R)
- M15: 5,506,698 km (0.077 R)
- M16: 5,590,323 km (0.072 R)
- M17: 6,449,463 km (0.097 R)
- M18: 7,029,903 km (0.119 R)
- M19: 7,627,098 km (0.113 R)
- M20: 7,908,192 km (0.04 R)
- M21: 8,050,011 km (0.042 R)
- M22: 8,771,970 km (0.037 R)
- M23: 8,918,875 km (0.062 R)
- M24: 9,017,161 km (0.067 R)
- M25: 9,115,896 km (0.109 R)
- M26: 9,715,933 km (0.082 R)
- M27: 10,277,075 km (0.107 R)
- M28: 10,691,909 km (0.073 R)
- M29: 11,165,087 km (0.04 R)
- M30: 11,271,152 km (0.08 R)
- M31: 12,186,392 km (0.079 R)
- M32: 12,846,867 km (0.061 R)
- M33: 13,462,312 km (0.067 R)
- M34: 14,664,032 km (0.114 R)
- M35: 16,199,056 km (0.1 R)
- M36: 16,681,509 km (0.078 R)
- M37: 17,352,755 km (0.117 R)
- M38: 17,414,239 km (0.088 R)
- M39: 17,660,777 km (0.111 R)
- M40: 18,032,677 km (0.062 R)
- M41: 18,219,674 km (0.107 R)
- M42: 18,847,686 km (0.085 R)
- M43: 19,291,393 km (0.075 R)
- M44: 20,838,834 km (0.085 R)
- M45: 21,363,474 km (0.12 R)
- M46: 22,492,788 km (0.118 R)
- M47: 22,626,977 km (0.083 R)
- M48: 22,828,635 km (0.099 R)
- M49: 26,277,165 km (0.102 R)
- M50: 27,200,184 km (0.042 R)
- M51: 27,343,050 km (0.077 R)
- M52: 27,414,558 km (0.102 R)
- M53: 28,640,662 km (0.096 R)
- M54: 28,786,071 km (0.088 R)
- M55: 28,858,925 km (0.06 R)
- M56: 32,197,800 km (0.055 R)
- M57: 32,652,278 km (0.106 R)
- M58: 34,182,066 km (0.099 R)
- M59: 34,800,504 km (0.108 R)
- M60: 35,813,431 km (0.088 R)
- M61: 36,520,281 km (0.099 R)
- M62: 36,678,107 km (0.111 R)
- M63: 37,947,893 km (0.097 R)
- M64: 38,347,769 km (0.094 R)
- M65: 38,748,840 km (0.032 R)
- M66: 40,123,346 km (0.079 R)
- M67: 41,103,062 km (0.108 R)
- M68: 42,421,767 km (0.098 R)
- M69: 42,504,645 km (0.097 R)
- M70: 43,503,210 km (0.116 R)
- M71: 44,593,928 km (0.106 R)
- M72: 45,269,512 km (0.069 R)
- M73: 46,374,592 km (0.071 R)
- M74: 48,178,593 km (0.111 R)
- M75: 50,092,847 km (0.104 R)
- M76: 50,619,282 km (0.111 R)
- M77: 50,883,173 km (0.059 R)
- M78: 51,235,625 km (0.112 R)
- M79: 53,995,407 km (0.072 R)
- M80: 54,265,132 km (0.108 R)
- M81: 55,257,564 km (0.089 R)
- M82: 56,985,868 km (0.11 R)
- M83: 59,009,179 km (0.047 R)
- M84: 59,843,786 km (0.093 R)
- M85: 60,495,434 km (0.104 R)
- M86: 62,559,137 km (0.071 R)
- M87: 62,747,929 km (0.071 R)
Planet 8 - Gas Giant
Semi-Major Axis: 13.16 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 826.1
Radius: 13.1
Gravity: 4.81 G
Time & Orbit
Eccentricity (e): 0.22
Orbit Range: 10.26 AU - 16.06 AU
Year: 16626 Days
Day: 6.7 Hours
Environment
Temp: -179 °C
Axial Tilt: 1.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (88)
Outer Limit: 71,603,233 km
- M1: 196,123 km (0.104 R)
- M2: 380,278 km (0.111 R)
- M3: 734,376 km (0.108 R)
- M4: 844,929 km (0.087 R)
- M5: 1,010,085 km (0.1 R)
- M6: 1,485,956 km (0.039 R)
- M7: 1,600,996 km (0.088 R)
- M8: 1,719,179 km (0.095 R)
- M9: 2,059,813 km (0.053 R)
- M10: 2,156,453 km (0.12 R)
- M11: 2,490,206 km (0.098 R)
- M12: 2,698,446 km (0.112 R)
- M13: 3,095,629 km (0.098 R)
- M14: 3,434,468 km (0.117 R)
- M15: 3,550,257 km (0.063 R)
- M16: 4,148,349 km (0.092 R)
- M17: 6,457,093 km (0.068 R)
- M18: 6,793,838 km (0.064 R)
- M19: 7,635,475 km (0.088 R)
- M20: 7,889,343 km (0.102 R)
- M21: 9,416,288 km (0.114 R)
- M22: 9,579,500 km (0.062 R)
- M23: 9,853,413 km (0.048 R)
- M24: 10,804,407 km (0.116 R)
- M25: 11,667,736 km (0.116 R)
- M26: 12,078,233 km (0.073 R)
- M27: 12,793,012 km (0.11 R)
- M28: 15,146,186 km (0.03 R)
- M29: 15,401,550 km (0.095 R)
- M30: 15,722,736 km (0.086 R)
- M31: 15,916,615 km (0.086 R)
- M32: 16,176,317 km (0.114 R)
- M33: 17,029,922 km (0.064 R)
- M34: 17,428,900 km (0.088 R)
- M35: 18,371,815 km (0.055 R)
- M36: 18,712,599 km (0.094 R)
- M37: 19,747,368 km (0.057 R)
- M38: 22,888,923 km (0.099 R)
- M39: 23,108,682 km (0.098 R)
- M40: 23,402,792 km (0.101 R)
- M41: 24,069,250 km (0.032 R)
- M42: 24,367,548 km (0.088 R)
- M43: 26,797,018 km (0.04 R)
- M44: 27,183,579 km (0.075 R)
- M45: 27,727,816 km (0.089 R)
- M46: 28,354,332 km (0.116 R)
- M47: 29,302,782 km (0.118 R)
- M48: 29,780,897 km (0.052 R)
- M49: 30,181,370 km (0.11 R)
- M50: 32,128,088 km (0.103 R)
- M51: 34,450,295 km (0.039 R)
- M52: 36,056,677 km (0.108 R)
- M53: 38,294,213 km (0.047 R)
- M54: 39,517,624 km (0.092 R)
- M55: 41,198,506 km (0.071 R)
- M56: 42,631,952 km (0.102 R)
- M57: 43,808,689 km (0.12 R)
- M58: 44,355,320 km (0.099 R)
- M59: 47,309,130 km (0.098 R)
- M60: 47,963,770 km (0.084 R)
- M61: 49,281,877 km (0.115 R)
- M62: 49,660,659 km (0.102 R)
- M63: 50,516,658 km (0.101 R)
- M64: 50,898,581 km (0.113 R)
- M65: 50,994,174 km (0.115 R)
- M66: 52,919,499 km (0.043 R)
- M67: 53,501,734 km (0.095 R)
- M68: 55,261,154 km (0.03 R)
- M69: 56,543,507 km (0.12 R)
- M70: 58,035,447 km (0.108 R)
- M71: 58,936,924 km (0.061 R)
- M72: 59,540,401 km (0.043 R)
- M73: 59,641,230 km (0.086 R)
- M74: 60,348,230 km (0.078 R)
- M75: 61,464,978 km (0.078 R)
- M76: 61,872,782 km (0.09 R)
- M77: 62,896,181 km (0.101 R)
- M78: 63,306,977 km (0.116 R)
- M79: 63,615,747 km (0.119 R)
- M80: 63,925,115 km (0.119 R)
- M81: 64,855,913 km (0.059 R)
- M82: 66,104,008 km (0.054 R)
- M83: 66,312,697 km (0.085 R)
- M84: 66,940,410 km (0.105 R)
- M85: 67,150,146 km (0.071 R)
- M86: 67,570,067 km (0.091 R)
- M87: 69,152,813 km (0.096 R)
- M88: 71,496,114 km (0.083 R)
Kuiper Belt
Range: 31.5 - 60.5 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 179 - 18,559 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.