🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.84 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.63

Radius: 1.22

Gravity: 1.1 G

Time & Orbit

Eccentricity (e): 0.134

Orbit Range: 0.73 AU - 0.95 AU

Year: 280 Days

Day: 43.2 Hours

Environment

Temp: 178 °C

Axial Tilt: 44 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Satellites (2)

Outer Limit: 55,270,748 km

• M1: 384,317 km (0.036 R)
• M2: 493,374 km (0.12 R)

Planet 2 - Terrestrial

Semi-Major Axis: 0.91 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.09

Radius: 1.57

Gravity: 1.25 G

Time & Orbit

Eccentricity (e): 0.171

Orbit Range: 0.75 AU - 1.07 AU

Year: 315 Days

Day: 43.7 Hours

Environment

Temp: 116 °C

Axial Tilt: 70.9 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 3 - Terrestrial

Semi-Major Axis: 1.01 AU

Status: HZ

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.58

Radius: 1.67

Gravity: 1.28 G

Time & Orbit

Eccentricity (e): 0.03

Orbit Range: 0.98 AU - 1.04 AU

Year: 369 Days

Day: 30.6 Hours

Environment

Temp: 21 °C

Axial Tilt: 5.5 °

Atmosphere: N₂, O₂

Biome: Oceanic/Continental

Satellites (1)

Outer Limit: 55,270,748 km

• M1: 903,272 km (0.116 R)

Planet 4 - Terrestrial

Semi-Major Axis: 1.88 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.99

Radius: 1

Gravity: 0.99 G

Time & Orbit

Eccentricity (e): 0.146

Orbit Range: 1.61 AU - 2.15 AU

Year: 937 Days

Day: 19.9 Hours

Environment

Temp: -64 °C

Axial Tilt: 39.3 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 55,270,748 km

• M1: 26,928 km (0.069 R)

Planet 5 - Gas Giant

Semi-Major Axis: 6.33 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 408.5

Radius: 9.8

Gravity: 4.25 G

Time & Orbit

Eccentricity (e): 0.21

Orbit Range: 5 AU - 7.66 AU

Year: 5788 Days

Day: 14.7 Hours

Environment

Temp: -147 °C

Axial Tilt: 13.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (82)

Outer Limit: 55,270,748 km

• M1: 124,316 km (0.095 R)
• M2: 189,241 km (0.066 R)
• M3: 424,559 km (0.093 R)
• M4: 521,648 km (0.036 R)
• M5: 594,951 km (0.088 R)
• M6: 706,401 km (0.118 R)
• M7: 837,748 km (0.109 R)
• M8: 977,772 km (0.073 R)
• M9: 1,071,121 km (0.036 R)
• M10: 1,296,116 km (0.083 R)
• M11: 1,475,185 km (0.117 R)
• M12: 1,824,346 km (0.057 R)
• M13: 2,164,382 km (0.076 R)
• M14: 2,270,297 km (0.068 R)
• M15: 2,469,113 km (0.085 R)
• M16: 2,845,202 km (0.052 R)
• M17: 2,922,694 km (0.077 R)
• M18: 3,651,235 km (0.054 R)
• M19: 4,255,461 km (0.063 R)
• M20: 4,389,052 km (0.085 R)
• M21: 4,501,550 km (0.115 R)
• M22: 4,592,056 km (0.116 R)
• M23: 4,960,665 km (0.087 R)
• M24: 5,077,801 km (0.083 R)
• M25: 5,458,976 km (0.109 R)
• M26: 5,531,531 km (0.12 R)
• M27: 5,800,059 km (0.112 R)
• M28: 6,023,109 km (0.042 R)
• M29: 6,452,007 km (0.073 R)
• M30: 6,760,777 km (0.088 R)
• M31: 6,838,717 km (0.069 R)
• M32: 7,179,950 km (0.085 R)
• M33: 7,851,943 km (0.078 R)
• M34: 9,025,688 km (0.104 R)
• M35: 9,487,048 km (0.102 R)
• M36: 9,720,720 km (0.095 R)
• M37: 10,074,818 km (0.119 R)
• M38: 10,223,518 km (0.072 R)
• M39: 10,463,174 km (0.112 R)
• M40: 10,613,819 km (0.095 R)
• M41: 10,765,212 km (0.067 R)
• M42: 10,947,871 km (0.111 R)
• M43: 11,688,530 km (0.052 R)
• M44: 12,223,044 km (0.074 R)
• M45: 12,605,266 km (0.059 R)
• M46: 12,829,962 km (0.108 R)
• M47: 13,973,488 km (0.099 R)
• M48: 14,206,113 km (0.115 R)
• M49: 14,574,124 km (0.07 R)
• M50: 15,081,261 km (0.076 R)
• M51: 15,422,493 km (0.107 R)
• M52: 15,594,082 km (0.079 R)
• M53: 15,662,897 km (0.097 R)
• M54: 15,766,419 km (0.113 R)
• M55: 16,321,726 km (0.095 R)
• M56: 16,461,600 km (0.103 R)
• M57: 16,531,612 km (0.067 R)
• M58: 17,202,409 km (0.077 R)
• M59: 18,206,958 km (0.05 R)
• M60: 18,279,513 km (0.108 R)
• M61: 18,461,125 km (0.09 R)
• M62: 19,119,954 km (0.106 R)
• M63: 19,378,310 km (0.043 R)
• M64: 19,712,063 km (0.06 R)
• M65: 20,122,559 km (0.095 R)
• M66: 20,272,606 km (0.09 R)
• M67: 20,687,142 km (0.105 R)
• M68: 21,870,012 km (0.091 R)
• M69: 23,074,873 km (0.075 R)
• M70: 23,863,553 km (0.113 R)
• M71: 24,341,070 km (0.104 R)
• M72: 24,661,209 km (0.107 R)
• M73: 24,861,969 km (0.114 R)
• M74: 24,942,303 km (0.066 R)
• M75: 25,305,527 km (0.072 R)
• M76: 26,118,741 km (0.063 R)
• M77: 26,241,411 km (0.074 R)
• M78: 26,323,391 km (0.1 R)
• M79: 26,610,768 km (0.083 R)
• M80: 26,816,615 km (0.102 R)
• M81: 26,940,482 km (0.062 R)
• M82: 27,023,060 km (0.038 R)

Planet 6 - Gas Giant

Semi-Major Axis: 6.94 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 874.3

Radius: 11

Gravity: 7.23 G

Time & Orbit

Eccentricity (e): 0.051

Orbit Range: 6.59 AU - 7.29 AU

Year: 6645 Days

Day: 14.1 Hours

Environment

Temp: -160 °C

Axial Tilt: 47.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (86)

Outer Limit: 55,270,748 km

• M1: 224,247 km (0.11 R)
• M2: 591,211 km (0.113 R)
• M3: 673,789 km (0.079 R)
• M4: 1,715,738 km (0.094 R)
• M5: 1,901,389 km (0.1 R)
• M6: 2,028,996 km (0.105 R)
• M7: 2,137,454 km (0.081 R)
• M8: 2,638,308 km (0.066 R)
• M9: 3,404,399 km (0.081 R)
• M10: 3,718,853 km (0.097 R)
• M11: 3,906,599 km (0.119 R)
• M12: 4,042,733 km (0.071 R)
• M13: 4,347,613 km (0.086 R)
• M14: 4,488,834 km (0.119 R)
• M15: 4,746,740 km (0.029 R)
• M16: 4,862,978 km (0.091 R)
• M17: 6,298,370 km (0.076 R)
• M18: 6,458,439 km (0.1 R)
• M19: 7,245,474 km (0.107 R)
• M20: 7,446,982 km (0.091 R)
• M21: 7,718,502 km (0.09 R)
• M22: 8,694,628 km (0.055 R)
• M23: 8,837,195 km (0.086 R)
• M24: 9,488,694 km (0.076 R)
• M25: 10,570,735 km (0.041 R)
• M26: 11,967,680 km (0.068 R)
• M27: 12,046,967 km (0.083 R)
• M28: 12,126,403 km (0.049 R)
• M29: 12,206,139 km (0.089 R)
• M30: 12,366,059 km (0.1 R)
• M31: 12,930,941 km (0.074 R)
• M32: 13,134,843 km (0.063 R)
• M33: 13,216,673 km (0.075 R)
• M34: 13,298,652 km (0.117 R)
• M35: 14,591,328 km (0.05 R)
• M36: 14,676,150 km (0.116 R)
• M37: 15,662,897 km (0.067 R)
• M38: 15,923,796 km (0.106 R)
• M39: 16,011,011 km (0.106 R)
• M40: 16,317,837 km (0.083 R)
• M41: 16,582,475 km (0.099 R)
• M42: 16,892,891 km (0.117 R)
• M43: 17,160,521 km (0.09 R)
• M44: 17,519,556 km (0.091 R)
• M45: 17,835,657 km (0.107 R)
• M46: 17,926,313 km (0.109 R)
• M47: 18,017,268 km (0.102 R)
• M48: 19,072,831 km (0.116 R)
• M49: 19,538,080 km (0.093 R)
• M50: 20,384,954 km (0.063 R)
• M51: 20,765,232 km (0.056 R)
• M52: 21,004,139 km (0.083 R)
• M53: 21,919,978 km (0.098 R)
• M54: 22,114,455 km (0.115 R)
• M55: 22,260,762 km (0.094 R)
• M56: 23,046,150 km (0.119 R)
• M57: 23,491,952 km (0.106 R)
• M58: 23,890,630 km (0.071 R)
• M59: 24,040,677 km (0.054 R)
• M60: 24,392,082 km (0.099 R)
• M61: 25,405,458 km (0.052 R)
• M62: 26,174,541 km (0.093 R)
• M63: 26,951,253 km (0.057 R)
• M64: 27,420,841 km (0.095 R)
• M65: 27,578,068 km (0.081 R)
• M66: 28,262,479 km (0.041 R)
• M67: 28,421,351 km (0.106 R)
• M68: 29,005,980 km (0.097 R)
• M69: 29,112,643 km (0.093 R)
• M70: 30,133,050 km (0.037 R)
• M71: 30,511,982 km (0.072 R)
• M72: 30,620,440 km (0.083 R)
• M73: 31,933,012 km (0.117 R)
• M74: 32,098,467 km (0.095 R)
• M75: 33,711,581 km (0.114 R)
• M76: 34,839,549 km (0.102 R)
• M77: 35,294,177 km (0.085 R)
• M78: 35,807,896 km (0.064 R)
• M79: 36,439,199 km (0.103 R)
• M80: 36,669,729 km (0.055 R)
• M81: 37,016,348 km (0.083 R)
• M82: 37,538,444 km (0.092 R)
• M83: 38,179,770 km (0.115 R)
• M84: 38,296,756 km (0.036 R)
• M85: 38,824,687 km (0.092 R)
• M86: 39,119,095 km (0.063 R)

Planet 7 - Gas Giant

Semi-Major Axis: 7.39 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 322

Radius: 12.8

Gravity: 1.97 G

Time & Orbit

Eccentricity (e): 0.117

Orbit Range: 6.53 AU - 8.25 AU

Year: 7301 Days

Day: 6.9 Hours

Environment

Temp: -156 °C

Axial Tilt: 27 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (75)

Outer Limit: 55,270,748 km

• M1: 339,438 km (0.112 R)
• M2: 446,101 km (0.116 R)
• M3: 557,551 km (0.1 R)
• M4: 813,962 km (0.061 R)
• M5: 1,025,493 km (0.114 R)
• M6: 1,138,440 km (0.049 R)
• M7: 1,408,763 km (0.112 R)
• M8: 1,784,703 km (0.12 R)
• M9: 2,047,097 km (0.093 R)
• M10: 2,266,258 km (0.073 R)
• M11: 2,551,092 km (0.084 R)
• M12: 2,827,699 km (0.094 R)
• M13: 2,990,162 km (0.076 R)
• M14: 3,261,084 km (0.098 R)
• M15: 3,453,317 km (0.104 R)
• M16: 3,540,084 km (0.119 R)
• M17: 3,782,283 km (0.115 R)
• M18: 4,259,949 km (0.096 R)
• M19: 4,399,973 km (0.09 R)
• M20: 4,636,786 km (0.106 R)
• M21: 5,347,525 km (0.082 R)
• M22: 5,498,919 km (0.068 R)
• M23: 5,857,654 km (0.115 R)
• M24: 6,171,361 km (0.075 R)
• M25: 6,303,755 km (0.034 R)
• M26: 6,436,897 km (0.036 R)
• M27: 6,706,323 km (0.108 R)
• M28: 8,576,147 km (0.041 R)
• M29: 9,022,547 km (0.115 R)
• M30: 9,354,654 km (0.062 R)
• M31: 10,062,252 km (0.073 R)
• M32: 10,249,698 km (0.061 R)
• M33: 11,171,969 km (0.112 R)
• M34: 11,398,610 km (0.108 R)
• M35: 11,790,706 km (0.037 R)
• M36: 13,095,349 km (0.111 R)
• M37: 13,678,332 km (0.084 R)
• M38: 13,851,416 km (0.091 R)
• M39: 13,955,686 km (0.106 R)
• M40: 14,304,848 km (0.065 R)
• M41: 14,657,151 km (0.047 R)
• M42: 14,763,365 km (0.075 R)
• M43: 15,154,863 km (0.097 R)
• M44: 15,334,081 km (0.042 R)
• M45: 15,441,941 km (0.066 R)
• M46: 15,984,981 km (0.065 R)
• M47: 16,203,843 km (0.114 R)
• M48: 16,423,752 km (0.109 R)
• M49: 16,570,956 km (0.099 R)
• M50: 16,755,560 km (0.093 R)
• M51: 16,866,711 km (0.084 R)
• M52: 18,485,958 km (0.104 R)
• M53: 19,217,193 km (0.034 R)
• M54: 20,430,432 km (0.114 R)
• M55: 20,588,856 km (0.099 R)
• M56: 21,306,626 km (0.045 R)
• M57: 22,235,629 km (0.078 R)
• M58: 22,807,542 km (0.097 R)
• M59: 23,219,086 km (0.096 R)
• M60: 23,674,611 km (0.104 R)
• M61: 25,526,184 km (0.038 R)
• M62: 25,910,650 km (0.102 R)
• M63: 26,039,305 km (0.109 R)
• M64: 26,125,024 km (0.102 R)
• M65: 26,598,801 km (0.068 R)
• M66: 26,988,653 km (0.106 R)
• M67: 27,423,982 km (0.083 R)
• M68: 28,433,918 km (0.059 R)
• M69: 28,655,173 km (0.066 R)
• M70: 28,788,165 km (0.036 R)
• M71: 29,010,169 km (0.054 R)
• M72: 29,232,920 km (0.11 R)
• M73: 29,411,390 km (0.033 R)
• M74: 29,724,798 km (0.061 R)
• M75: 29,859,436 km (0.102 R)

Planet 8 - Ice Giant

Semi-Major Axis: 14.42 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 969.3

Radius: 6

Gravity: 26.93 G

Time & Orbit

Eccentricity (e): 0.114

Orbit Range: 12.78 AU - 16.06 AU

Year: 19901 Days

Day: 24.8 Hours

Environment

Temp: -183 °C

Axial Tilt: 35.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (93)

Outer Limit: 55,270,748 km

• M1: 88,562 km (0.07 R)
• M2: 452,085 km (0.107 R)
• M3: 997,369 km (0.118 R)
• M4: 1,293,722 km (0.027 R)
• M5: 1,821,803 km (0.049 R)
• M6: 1,892,263 km (0.092 R)
• M7: 2,565,454 km (0.108 R)
• M8: 3,010,358 km (0.098 R)
• M9: 3,305,963 km (0.12 R)
• M10: 3,610,844 km (0.117 R)
• M11: 3,834,044 km (0.062 R)
• M12: 4,294,057 km (0.107 R)
• M13: 4,530,721 km (0.103 R)
• M14: 4,722,954 km (0.106 R)
• M15: 4,967,248 km (0.051 R)
• M16: 5,165,614 km (0.119 R)
• M17: 5,932,304 km (0.109 R)
• M18: 6,037,172 km (0.096 R)
• M19: 6,142,788 km (0.097 R)
• M20: 6,409,222 km (0.099 R)
• M21: 6,733,999 km (0.093 R)
• M22: 7,512,655 km (0.111 R)
• M23: 7,626,200 km (0.092 R)
• M24: 8,202,601 km (0.12 R)
• M25: 9,335,655 km (0.102 R)
• M26: 9,580,547 km (0.093 R)
• M27: 9,951,699 km (0.105 R)
• M28: 10,264,508 km (0.06 R)
• M29: 10,517,179 km (0.116 R)
• M30: 11,417,459 km (0.091 R)
• M31: 12,881,424 km (0.08 R)
• M32: 13,497,169 km (0.032 R)
• M33: 14,122,488 km (0.105 R)
• M34: 14,473,893 km (0.07 R)
• M35: 14,757,232 km (0.104 R)
• M36: 15,329,144 km (0.094 R)
• M37: 16,054,395 km (0.09 R)
• M38: 16,274,154 km (0.1 R)
• M39: 17,462,859 km (0.078 R)
• M40: 17,991,538 km (0.053 R)
• M41: 18,219,824 km (0.084 R)
• M42: 18,679,239 km (0.12 R)
• M43: 19,687,529 km (0.105 R)
• M44: 19,922,696 km (0.069 R)
• M45: 20,237,750 km (0.1 R)
• M46: 20,793,057 km (0.104 R)
• M47: 21,112,598 km (0.036 R)
• M48: 21,272,967 km (0.066 R)
• M49: 22,734,688 km (0.118 R)
• M50: 24,564,718 km (0.111 R)
• M51: 25,582,732 km (0.094 R)
• M52: 25,925,012 km (0.073 R)
• M53: 29,520,896 km (0.101 R)
• M54: 30,060,047 km (0.104 R)
• M55: 30,150,254 km (0.112 R)
• M56: 30,784,100 km (0.096 R)
• M57: 30,874,906 km (0.078 R)
• M58: 31,697,096 km (0.055 R)
• M59: 32,526,467 km (0.107 R)
• M60: 32,897,320 km (0.117 R)
• M61: 32,990,220 km (0.116 R)
• M62: 33,362,868 km (0.069 R)
• M63: 35,914,410 km (0.116 R)
• M64: 39,807,993 km (0.108 R)
• M65: 41,101,865 km (0.082 R)
• M66: 43,628,873 km (0.113 R)
• M67: 44,037,724 km (0.112 R)
• M68: 46,309,666 km (0.092 R)
• M69: 47,459,924 km (0.116 R)
• M70: 47,669,960 km (0.081 R)
• M71: 50,322,629 km (0.032 R)
• M72: 54,225,787 km (0.114 R)
• M73: 54,885,664 km (0.1 R)
• M74: 55,327,127 km (0.089 R)
• M75: 55,437,680 km (0.07 R)
• M76: 58,000,291 km (0.055 R)
• M77: 58,224,987 km (0.091 R)
• M78: 59,013,667 km (0.115 R)
• M79: 59,579,147 km (0.113 R)
• M80: 61,514,944 km (0.107 R)
• M81: 61,858,720 km (0.093 R)
• M82: 62,663,406 km (0.057 R)
• M83: 64,050,777 km (0.104 R)
• M84: 67,563,335 km (0.061 R)
• M85: 69,223,872 km (0.079 R)
• M86: 70,537,939 km (0.072 R)
• M87: 71,258,103 km (0.061 R)
• M88: 72,101,536 km (0.036 R)
• M89: 75,630,550 km (0.12 R)
• M90: 76,367,619 km (0.089 R)
• M91: 81,091,022 km (0.09 R)
• M92: 84,249,781 km (0.119 R)
• M93: 84,504,247 km (0.096 R)

Planet 9 - Ice Giant

Semi-Major Axis: 17.34 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 152.5

Radius: 5.8

Gravity: 4.53 G

Time & Orbit

Eccentricity (e): 0.145

Orbit Range: 14.83 AU - 19.85 AU

Year: 26242 Days

Day: 22.3 Hours

Environment

Temp: -188 °C

Axial Tilt: 23.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (59)

Outer Limit: 55,270,748 km

• M1: 77,043 km (0.087 R)
• M2: 127,308 km (0.096 R)
• M3: 358,885 km (0.114 R)
• M4: 634,594 km (0.1 R)
• M5: 1,344,586 km (0.106 R)
• M6: 1,870,273 km (0.092 R)
• M7: 2,196,845 km (0.115 R)
• M8: 3,057,032 km (0.091 R)
• M9: 3,604,860 km (0.066 R)
• M10: 4,078,487 km (0.119 R)
• M11: 4,825,279 km (0.104 R)
• M12: 5,009,285 km (0.081 R)
• M13: 5,233,083 km (0.07 R)
• M14: 5,346,179 km (0.046 R)
• M15: 6,200,533 km (0.11 R)
• M16: 11,015,340 km (0.1 R)
• M17: 12,697,269 km (0.031 R)
• M18: 14,193,846 km (0.118 R)
• M19: 14,246,355 km (0.065 R)
• M20: 14,882,595 km (0.051 R)
• M21: 17,069,267 km (0.068 R)
• M22: 17,518,509 km (0.112 R)
• M23: 17,857,947 km (0.085 R)
• M24: 18,889,424 km (0.094 R)
• M25: 18,947,318 km (0.053 R)
• M26: 19,763,674 km (0.056 R)
• M27: 21,854,304 km (0.091 R)
• M28: 22,158,736 km (0.081 R)
• M29: 22,280,808 km (0.11 R)
• M30: 22,525,699 km (0.115 R)
• M31: 24,265,223 km (0.108 R)
• M32: 25,087,413 km (0.106 R)
• M33: 26,564,393 km (0.05 R)
• M34: 28,135,320 km (0.098 R)
• M35: 29,333,150 km (0.106 R)
• M36: 31,503,516 km (0.072 R)
• M37: 32,885,950 km (0.102 R)
• M38: 35,067,686 km (0.065 R)
• M39: 37,078,131 km (0.116 R)
• M40: 38,024,039 km (0.099 R)
• M41: 38,683,765 km (0.084 R)
• M42: 40,759,885 km (0.07 R)
• M43: 41,059,380 km (0.119 R)
• M44: 41,510,118 km (0.026 R)
• M45: 42,264,839 km (0.105 R)
• M46: 43,405,523 km (0.076 R)
• M47: 44,402,294 km (0.118 R)
• M48: 44,710,465 km (0.069 R)
• M49: 44,942,043 km (0.094 R)
• M50: 46,184,154 km (0.038 R)
• M51: 48,543,163 km (0.043 R)
• M52: 50,057,392 km (0.113 R)
• M53: 50,458,464 km (0.106 R)
• M54: 52,398,300 km (0.107 R)
• M55: 53,705,037 km (0.118 R)
• M56: 53,869,146 km (0.06 R)
• M57: 54,197,813 km (0.061 R)
• M58: 54,280,091 km (0.048 R)
• M59: 54,692,234 km (0.104 R)

Kuiper Belt

Range: 30.2 - 60.2 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 522 - 15,075 AU

Composition

Type: Cometary Reservoir

System's final boundary, containing trillions of icy planetesimals.

Gravitational Limit