Star System Generated (Seed: 1766520189)
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: 0.52 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 956.1
Radius: 11.5
Gravity: 7.23 G
Time & Orbit
Eccentricity (e): 0.149
Orbit Range: 0.44 AU - 0.6 AU
Year: 254 Days
Day: 9.8 Hours
Environment
Temp: -139 °C
Axial Tilt: 47.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (36)
Outer Limit: 29,382,576 km
- M1: 159,771 km (0.115 R)
- M2: 231,578 km (0.112 R)
- M3: 311,313 km (0.049 R)
- M4: 388,356 km (0.119 R)
- M5: 468,840 km (0.107 R)
- M6: 550,670 km (0.109 R)
- M7: 651,200 km (0.085 R)
- M8: 745,147 km (0.073 R)
- M9: 906,713 km (0.074 R)
- M10: 1,029,233 km (0.094 R)
- M11: 1,124,976 km (0.112 R)
- M12: 1,261,858 km (0.083 R)
- M13: 1,334,712 km (0.036 R)
- M14: 1,426,715 km (0.062 R)
- M15: 1,608,177 km (0.113 R)
- M16: 1,692,401 km (0.115 R)
- M17: 1,802,355 km (0.037 R)
- M18: 1,974,393 km (0.11 R)
- M19: 2,049,790 km (0.091 R)
- M20: 2,193,254 km (0.076 R)
- M21: 2,287,351 km (0.075 R)
- M22: 2,372,024 km (0.051 R)
- M23: 2,452,507 km (0.089 R)
- M24: 2,588,791 km (0.107 R)
- M25: 3,030,105 km (0.109 R)
- M26: 3,111,785 km (0.099 R)
- M27: 3,188,379 km (0.057 R)
- M28: 3,301,475 km (0.081 R)
- M29: 3,428,185 km (0.119 R)
- M30: 3,519,589 km (0.112 R)
- M31: 3,711,224 km (0.079 R)
- M32: 3,811,455 km (0.067 R)
- M33: 3,963,596 km (0.12 R)
- M34: 4,059,787 km (0.05 R)
- M35: 4,267,429 km (0.031 R)
- M36: 4,425,554 km (0.064 R)
Planet 2 - Gas Giant
Semi-Major Axis: 0.78 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 39.2
Radius: 12.5
Gravity: 0.25 G
Time & Orbit
Eccentricity (e): 0
Orbit Range: 0.78 AU - 0.78 AU
Year: 467 Days
Day: 8.6 Hours
Environment
Temp: -160 °C
Axial Tilt: 10.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (22)
Outer Limit: 29,382,576 km
- M1: 156,031 km (0.112 R)
- M2: 250,876 km (0.11 R)
- M3: 348,413 km (0.099 R)
- M4: 445,652 km (0.092 R)
- M5: 542,143 km (0.08 R)
- M6: 639,381 km (0.075 R)
- M7: 718,070 km (0.11 R)
- M8: 802,742 km (0.093 R)
- M9: 884,423 km (0.118 R)
- M10: 981,212 km (0.113 R)
- M11: 1,129,913 km (0.054 R)
- M12: 1,291,927 km (0.046 R)
- M13: 1,387,071 km (0.112 R)
- M14: 1,484,609 km (0.098 R)
- M15: 1,607,878 km (0.092 R)
- M16: 1,728,753 km (0.085 R)
- M17: 1,834,519 km (0.118 R)
- M18: 1,948,811 km (0.073 R)
- M19: 2,059,065 km (0.065 R)
- M20: 2,158,548 km (0.087 R)
- M21: 2,240,079 km (0.089 R)
- M22: 2,319,365 km (0.057 R)
Planet 3 - Gas Giant
Semi-Major Axis: 1.58 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 850.8
Radius: 9.2
Gravity: 10.05 G
Time & Orbit
Eccentricity (e): 0.104
Orbit Range: 1.42 AU - 1.74 AU
Year: 1347 Days
Day: 12.3 Hours
Environment
Temp: -190 °C
Axial Tilt: 7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (63)
Outer Limit: 29,382,576 km
- M1: 116,686 km (0.107 R)
- M2: 209,886 km (0.051 R)
- M3: 268,977 km (0.11 R)
- M4: 379,231 km (0.114 R)
- M5: 571,165 km (0.071 R)
- M6: 765,642 km (0.044 R)
- M7: 997,818 km (0.118 R)
- M8: 1,063,790 km (0.036 R)
- M9: 1,351,318 km (0.109 R)
- M10: 1,614,610 km (0.105 R)
- M11: 1,682,976 km (0.115 R)
- M12: 1,987,408 km (0.104 R)
- M13: 2,092,874 km (0.12 R)
- M14: 2,157,052 km (0.111 R)
- M15: 2,232,748 km (0.114 R)
- M16: 2,420,344 km (0.083 R)
- M17: 2,978,045 km (0.079 R)
- M18: 3,086,952 km (0.086 R)
- M19: 3,184,939 km (0.083 R)
- M20: 3,447,184 km (0.103 R)
- M21: 3,510,613 km (0.073 R)
- M22: 3,781,685 km (0.069 R)
- M23: 3,873,388 km (0.052 R)
- M24: 4,019,246 km (0.111 R)
- M25: 4,139,971 km (0.049 R)
- M26: 4,453,977 km (0.1 R)
- M27: 4,620,779 km (0.093 R)
- M28: 4,860,884 km (0.119 R)
- M29: 5,104,878 km (0.071 R)
- M30: 5,162,922 km (0.076 R)
- M31: 5,441,623 km (0.105 R)
- M32: 5,545,593 km (0.092 R)
- M33: 5,983,167 km (0.1 R)
- M34: 6,152,063 km (0.032 R)
- M35: 6,260,372 km (0.064 R)
- M36: 6,859,511 km (0.086 R)
- M37: 7,133,425 km (0.054 R)
- M38: 7,775,499 km (0.088 R)
- M39: 7,909,539 km (0.112 R)
- M40: 8,282,037 km (0.103 R)
- M41: 8,401,865 km (0.083 R)
- M42: 8,504,938 km (0.078 R)
- M43: 8,712,430 km (0.111 R)
- M44: 8,781,844 km (0.058 R)
- M45: 9,202,962 km (0.11 R)
- M46: 9,291,524 km (0.1 R)
- M47: 9,487,347 km (0.055 R)
- M48: 10,046,544 km (0.065 R)
- M49: 10,192,552 km (0.065 R)
- M50: 10,265,855 km (0.088 R)
- M51: 10,357,708 km (0.103 R)
- M52: 10,560,862 km (0.118 R)
- M53: 10,727,963 km (0.082 R)
- M54: 10,802,462 km (0.084 R)
- M55: 10,989,759 km (0.103 R)
- M56: 11,253,500 km (0.105 R)
- M57: 11,329,346 km (0.073 R)
- M58: 11,424,341 km (0.1 R)
- M59: 11,729,969 km (0.119 R)
- M60: 12,193,573 km (0.091 R)
- M61: 12,564,725 km (0.041 R)
- M62: 13,398,584 km (0.053 R)
- M63: 13,458,872 km (0.12 R)
Planet 4 - Gas Giant
Semi-Major Axis: 1.85 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 935.9
Radius: 9.3
Gravity: 10.82 G
Time & Orbit
Eccentricity (e): 0.129
Orbit Range: 1.61 AU - 2.09 AU
Year: 1707 Days
Day: 13.2 Hours
Environment
Temp: -205 °C
Axial Tilt: 35.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (69)
Outer Limit: 29,382,576 km
- M1: 131,945 km (0.106 R)
- M2: 217,515 km (0.069 R)
- M3: 286,480 km (0.032 R)
- M4: 348,563 km (0.12 R)
- M5: 429,645 km (0.101 R)
- M6: 614,099 km (0.027 R)
- M7: 1,097,600 km (0.066 R)
- M8: 1,234,631 km (0.08 R)
- M9: 1,305,241 km (0.069 R)
- M10: 1,450,800 km (0.087 R)
- M11: 1,590,824 km (0.12 R)
- M12: 1,826,740 km (0.065 R)
- M13: 1,896,303 km (0.041 R)
- M14: 2,002,367 km (0.069 R)
- M15: 2,208,065 km (0.097 R)
- M16: 2,458,940 km (0.098 R)
- M17: 2,600,909 km (0.06 R)
- M18: 3,112,384 km (0.056 R)
- M19: 3,252,258 km (0.057 R)
- M20: 3,422,799 km (0.086 R)
- M21: 3,552,650 km (0.094 R)
- M22: 3,743,088 km (0.064 R)
- M23: 4,303,781 km (0.116 R)
- M24: 4,538,500 km (0.119 R)
- M25: 4,729,387 km (0.113 R)
- M26: 5,053,566 km (0.065 R)
- M27: 5,401,680 km (0.119 R)
- M28: 5,723,315 km (0.105 R)
- M29: 5,826,239 km (0.09 R)
- M30: 6,033,881 km (0.12 R)
- M31: 6,103,593 km (0.088 R)
- M32: 6,191,108 km (0.078 R)
- M33: 6,332,179 km (0.115 R)
- M34: 6,474,297 km (0.049 R)
- M35: 6,653,365 km (0.031 R)
- M36: 6,743,573 km (0.09 R)
- M37: 7,053,240 km (0.04 R)
- M38: 7,535,843 km (0.078 R)
- M39: 7,990,770 km (0.118 R)
- M40: 8,144,557 km (0.091 R)
- M41: 8,221,749 km (0.093 R)
- M42: 8,337,987 km (0.095 R)
- M43: 8,415,778 km (0.038 R)
- M44: 8,689,991 km (0.119 R)
- M45: 8,927,403 km (0.071 R)
- M46: 9,086,874 km (0.097 R)
- M47: 9,652,653 km (0.051 R)
- M48: 9,877,947 km (0.119 R)
- M49: 9,981,020 km (0.085 R)
- M50: 10,712,105 km (0.081 R)
- M51: 11,030,749 km (0.098 R)
- M52: 11,244,823 km (0.091 R)
- M53: 11,764,377 km (0.067 R)
- M54: 11,851,742 km (0.107 R)
- M55: 11,983,238 km (0.082 R)
- M56: 12,049,211 km (0.039 R)
- M57: 12,849,560 km (0.089 R)
- M58: 13,438,227 km (0.047 R)
- M59: 14,012,533 km (0.079 R)
- M60: 14,128,472 km (0.119 R)
- M61: 14,712,352 km (0.046 R)
- M62: 15,256,589 km (0.1 R)
- M63: 15,328,097 km (0.103 R)
- M64: 15,471,412 km (0.056 R)
- M65: 15,639,111 km (0.117 R)
- M66: 15,735,302 km (0.105 R)
- M67: 16,000,689 km (0.116 R)
- M68: 16,243,187 km (0.095 R)
- M69: 16,316,191 km (0.115 R)
Planet 5 - Gas Giant
Semi-Major Axis: 2.5 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 753.1
Radius: 13.4
Gravity: 4.19 G
Time & Orbit
Eccentricity (e): 0.226
Orbit Range: 1.94 AU - 3.07 AU
Year: 2681 Days
Day: 14 Hours
Environment
Temp: -202 °C
Axial Tilt: 25.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (69)
Outer Limit: 29,382,576 km
- M1: 176,077 km (0.114 R)
- M2: 342,280 km (0.096 R)
- M3: 481,556 km (0.054 R)
- M4: 585,676 km (0.112 R)
- M5: 699,220 km (0.109 R)
- M6: 831,315 km (0.05 R)
- M7: 1,351,916 km (0.104 R)
- M8: 1,484,609 km (0.119 R)
- M9: 1,634,806 km (0.109 R)
- M10: 1,790,088 km (0.12 R)
- M11: 2,271,943 km (0.11 R)
- M12: 2,358,710 km (0.088 R)
- M13: 2,550,494 km (0.109 R)
- M14: 2,747,664 km (0.115 R)
- M15: 2,855,973 km (0.115 R)
- M16: 2,981,486 km (0.049 R)
- M17: 3,205,733 km (0.058 R)
- M18: 3,385,998 km (0.032 R)
- M19: 3,552,800 km (0.069 R)
- M20: 3,637,173 km (0.091 R)
- M21: 3,964,344 km (0.102 R)
- M22: 4,175,875 km (0.085 R)
- M23: 4,337,141 km (0.097 R)
- M24: 4,464,000 km (0.107 R)
- M25: 4,610,457 km (0.096 R)
- M26: 4,702,759 km (0.07 R)
- M27: 4,851,908 km (0.103 R)
- M28: 4,964,854 km (0.084 R)
- M29: 5,270,183 km (0.034 R)
- M30: 5,405,869 km (0.087 R)
- M31: 5,899,542 km (0.118 R)
- M32: 6,141,741 km (0.094 R)
- M33: 6,761,674 km (0.115 R)
- M34: 6,951,663 km (0.114 R)
- M35: 7,122,055 km (0.099 R)
- M36: 7,207,625 km (0.118 R)
- M37: 7,466,879 km (0.109 R)
- M38: 7,685,142 km (0.091 R)
- M39: 8,556,998 km (0.086 R)
- M40: 8,648,103 km (0.084 R)
- M41: 8,877,586 km (0.098 R)
- M42: 9,815,415 km (0.068 R)
- M43: 10,127,028 km (0.074 R)
- M44: 10,223,518 km (0.083 R)
- M45: 10,908,078 km (0.113 R)
- M46: 11,056,629 km (0.056 R)
- M47: 11,180,945 km (0.097 R)
- M48: 11,481,337 km (0.106 R)
- M49: 11,582,166 km (0.094 R)
- M50: 11,708,427 km (0.115 R)
- M51: 11,911,581 km (0.08 R)
- M52: 12,013,457 km (0.063 R)
- M53: 12,192,675 km (0.117 R)
- M54: 12,683,506 km (0.044 R)
- M55: 12,892,045 km (0.036 R)
- M56: 13,339,193 km (0.05 R)
- M57: 13,631,208 km (0.091 R)
- M58: 14,275,676 km (0.11 R)
- M59: 14,438,438 km (0.08 R)
- M60: 14,574,423 km (0.071 R)
- M61: 15,012,745 km (0.087 R)
- M62: 16,410,138 km (0.057 R)
- M63: 16,866,113 km (0.089 R)
- M64: 17,124,319 km (0.107 R)
- M65: 17,354,999 km (0.078 R)
- M66: 17,673,941 km (0.112 R)
- M67: 18,465,015 km (0.106 R)
- M68: 19,628,138 km (0.045 R)
- M69: 20,203,192 km (0.064 R)
Planet 6 - Gas Giant
Semi-Major Axis: 3.5 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 426
Radius: 13
Gravity: 2.52 G
Time & Orbit
Eccentricity (e): 0.247
Orbit Range: 2.64 AU - 4.36 AU
Year: 4441 Days
Day: 8.1 Hours
Environment
Temp: -211 °C
Axial Tilt: 34.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (71)
Outer Limit: 29,382,576 km
- M1: 181,911 km (0.062 R)
- M2: 278,551 km (0.032 R)
- M3: 395,088 km (0.098 R)
- M4: 544,686 km (0.082 R)
- M5: 865,274 km (0.107 R)
- M6: 955,033 km (0.078 R)
- M7: 1,257,669 km (0.077 R)
- M8: 1,481,318 km (0.048 R)
- M9: 1,661,434 km (0.036 R)
- M10: 1,805,048 km (0.075 R)
- M11: 2,151,666 km (0.11 R)
- M12: 2,357,214 km (0.089 R)
- M13: 2,454,303 km (0.082 R)
- M14: 2,536,282 km (0.04 R)
- M15: 2,719,988 km (0.071 R)
- M16: 2,977,746 km (0.066 R)
- M17: 3,628,796 km (0.104 R)
- M18: 5,059,550 km (0.041 R)
- M19: 5,164,866 km (0.094 R)
- M20: 5,292,324 km (0.035 R)
- M21: 5,463,763 km (0.099 R)
- M22: 5,724,512 km (0.111 R)
- M23: 5,967,160 km (0.106 R)
- M24: 6,738,636 km (0.084 R)
- M25: 6,831,536 km (0.108 R)
- M26: 6,995,047 km (0.116 R)
- M27: 7,088,994 km (0.041 R)
- M28: 7,349,893 km (0.069 R)
- M29: 8,225,489 km (0.096 R)
- M30: 8,324,822 km (0.111 R)
- M31: 8,424,604 km (0.11 R)
- M32: 9,082,685 km (0.081 R)
- M33: 9,288,532 km (0.039 R)
- M34: 10,154,105 km (0.114 R)
- M35: 10,287,546 km (0.1 R)
- M36: 10,556,075 km (0.084 R)
- M37: 10,745,465 km (0.073 R)
- M38: 10,963,430 km (0.075 R)
- M39: 11,292,844 km (0.096 R)
- M40: 11,431,222 km (0.099 R)
- M41: 12,301,134 km (0.116 R)
- M42: 12,672,286 km (0.093 R)
- M43: 12,960,262 km (0.097 R)
- M44: 13,163,266 km (0.086 R)
- M45: 13,337,997 km (0.112 R)
- M46: 13,513,475 km (0.05 R)
- M47: 13,601,588 km (0.063 R)
- M48: 13,748,792 km (0.07 R)
- M49: 13,926,215 km (0.1 R)
- M50: 14,432,754 km (0.088 R)
- M51: 14,552,881 km (0.099 R)
- M52: 15,556,383 km (0.069 R)
- M53: 15,772,104 km (0.103 R)
- M54: 16,175,419 km (0.1 R)
- M55: 16,707,988 km (0.114 R)
- M56: 17,119,083 km (0.076 R)
- M57: 17,693,838 km (0.105 R)
- M58: 17,886,819 km (0.078 R)
- M59: 18,113,011 km (0.103 R)
- M60: 18,307,488 km (0.082 R)
- M61: 18,405,026 km (0.081 R)
- M62: 18,633,312 km (0.042 R)
- M63: 19,888,738 km (0.108 R)
- M64: 21,171,240 km (0.103 R)
- M65: 21,444,705 km (0.085 R)
- M66: 21,616,294 km (0.111 R)
- M67: 22,168,160 km (0.038 R)
- M68: 22,445,814 km (0.056 R)
- M69: 22,585,090 km (0.069 R)
- M70: 23,109,879 km (0.118 R)
- M71: 23,250,501 km (0.059 R)
Planet 7 - Gas Giant
Semi-Major Axis: 4.39 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 405.4
Radius: 8.3
Gravity: 5.88 G
Time & Orbit
Eccentricity (e): 0.141
Orbit Range: 3.77 AU - 5.01 AU
Year: 6239 Days
Day: 14.8 Hours
Environment
Temp: -225 °C
Axial Tilt: 44.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (85)
Outer Limit: 29,382,576 km
- M1: 168,148 km (0.105 R)
- M2: 233,073 km (0.095 R)
- M3: 440,416 km (0.11 R)
- M4: 753,375 km (0.058 R)
- M5: 920,326 km (0.03 R)
- M6: 1,142,479 km (0.1 R)
- M7: 1,491,491 km (0.086 R)
- M8: 2,228,410 km (0.093 R)
- M9: 2,761,427 km (0.061 R)
- M10: 2,920,898 km (0.082 R)
- M11: 3,083,362 km (0.084 R)
- M12: 3,375,078 km (0.047 R)
- M13: 3,438,806 km (0.093 R)
- M14: 3,675,620 km (0.105 R)
- M15: 3,829,257 km (0.119 R)
- M16: 4,325,622 km (0.056 R)
- M17: 4,487,936 km (0.075 R)
- M18: 4,605,071 km (0.102 R)
- M19: 4,746,890 km (0.086 R)
- M20: 4,890,205 km (0.052 R)
- M21: 5,132,404 km (0.105 R)
- M22: 5,729,598 km (0.116 R)
- M23: 6,036,424 km (0.08 R)
- M24: 6,191,856 km (0.083 R)
- M25: 6,270,096 km (0.106 R)
- M26: 6,746,415 km (0.109 R)
- M27: 6,799,971 km (0.113 R)
- M28: 7,043,217 km (0.075 R)
- M29: 7,538,237 km (0.109 R)
- M30: 8,072,750 km (0.067 R)
- M31: 8,330,357 km (0.06 R)
- M32: 8,387,953 km (0.047 R)
- M33: 8,474,570 km (0.046 R)
- M34: 8,707,045 km (0.062 R)
- M35: 9,089,417 km (0.119 R)
- M36: 9,237,968 km (0.093 R)
- M37: 9,387,416 km (0.035 R)
- M38: 9,507,393 km (0.117 R)
- M39: 9,688,407 km (0.071 R)
- M40: 9,779,362 km (0.079 R)
- M41: 11,177,504 km (0.106 R)
- M42: 11,304,812 km (0.106 R)
- M43: 11,528,610 km (0.08 R)
- M44: 11,818,681 km (0.089 R)
- M45: 12,504,886 km (0.111 R)
- M46: 12,570,859 km (0.105 R)
- M47: 12,836,245 km (0.062 R)
- M48: 12,936,177 km (0.066 R)
- M49: 14,190,106 km (0.073 R)
- M50: 14,327,886 km (0.086 R)
- M51: 14,883,941 km (0.099 R)
- M52: 15,802,472 km (0.085 R)
- M53: 15,945,338 km (0.031 R)
- M54: 16,160,609 km (0.103 R)
- M55: 16,848,460 km (0.082 R)
- M56: 16,921,314 km (0.093 R)
- M57: 17,324,630 km (0.097 R)
- M58: 17,842,239 km (0.091 R)
- M59: 18,252,586 km (0.115 R)
- M60: 18,817,318 km (0.104 R)
- M61: 19,234,995 km (0.056 R)
- M62: 19,732,558 km (0.107 R)
- M63: 20,195,563 km (0.088 R)
- M64: 20,273,055 km (0.116 R)
- M65: 20,350,696 km (0.117 R)
- M66: 20,506,278 km (0.065 R)
- M67: 20,857,683 km (0.119 R)
- M68: 21,606,121 km (0.084 R)
- M69: 22,243,259 km (0.119 R)
- M70: 23,007,853 km (0.058 R)
- M71: 23,780,975 km (0.104 R)
- M72: 24,521,335 km (0.03 R)
- M73: 25,478,313 km (0.06 R)
- M74: 25,856,047 km (0.103 R)
- M75: 26,109,017 km (0.115 R)
- M76: 26,193,390 km (0.113 R)
- M77: 26,574,715 km (0.118 R)
- M78: 26,872,565 km (0.107 R)
- M79: 26,957,835 km (0.099 R)
- M80: 27,471,555 km (0.116 R)
- M81: 27,686,527 km (0.077 R)
- M82: 27,859,013 km (0.077 R)
- M83: 28,334,884 km (0.04 R)
- M84: 28,726,232 km (0.063 R)
- M85: 28,988,178 km (0.116 R)
Kuiper Belt
Range: 30 - 59 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 254 - 13,477 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.