🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.68 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.98

Radius: 1.74

Gravity: 1.31 G

Time & Orbit

Eccentricity (e): 0.067

Orbit Range: 0.63 AU - 0.73 AU

Year: 210 Days

Day: 22.7 Hours

Environment

Temp: 142 °C

Axial Tilt: 5.9 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Satellites (1)

Outer Limit: 110,097,414 km

• M1: 299,944 km (0.105 R)

Planet 2 - Terrestrial

Semi-Major Axis: 0.69 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.43

Radius: 1.81

Gravity: 1.35 G

Time & Orbit

Eccentricity (e): 0.006

Orbit Range: 0.69 AU - 0.69 AU

Year: 215 Days

Day: 15 Hours

Environment

Temp: 140 °C

Axial Tilt: 15.9 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 3 - Terrestrial

Semi-Major Axis: 1.09 AU

Status: HZ

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.74

Radius: 0.89

Gravity: 0.93 G

Time & Orbit

Eccentricity (e): 0.022

Orbit Range: 1.07 AU - 1.11 AU

Year: 426 Days

Day: 23.6 Hours

Environment

Temp: -7 °C

Axial Tilt: 5.4 °

Atmosphere: N₂, O₂

Biome: Arid/Tundra

Planet 4 - Terrestrial

Semi-Major Axis: 2.23 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 2.34

Radius: 1.41

Gravity: 1.18 G

Time & Orbit

Eccentricity (e): 0.247

Orbit Range: 1.68 AU - 2.78 AU

Year: 1248 Days

Day: 32.7 Hours

Environment

Temp: -85 °C

Axial Tilt: 36.6 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 5 - Gas Giant

Semi-Major Axis: 5.03 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 645.8

Radius: 11.8

Gravity: 4.64 G

Time & Orbit

Eccentricity (e): 0.215

Orbit Range: 3.95 AU - 6.11 AU

Year: 4227 Days

Day: 14.7 Hours

Environment

Temp: -147 °C

Axial Tilt: 5.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (74)

Outer Limit: 110,097,414 km

• M1: 156,031 km (0.118 R)
• M2: 283,488 km (0.107 R)
• M3: 563,086 km (0.086 R)
• M4: 764,894 km (0.116 R)
• M5: 954,434 km (0.113 R)
• M6: 1,068,278 km (0.097 R)
• M7: 1,296,266 km (0.111 R)
• M8: 1,815,969 km (0.106 R)
• M9: 2,327,144 km (0.113 R)
• M10: 2,680,345 km (0.059 R)
• M11: 2,771,301 km (0.109 R)
• M12: 2,863,453 km (0.115 R)
• M13: 3,013,051 km (0.116 R)
• M14: 3,203,638 km (0.116 R)
• M15: 3,616,977 km (0.118 R)
• M16: 3,758,647 km (0.111 R)
• M17: 4,194,724 km (0.107 R)
• M18: 4,537,902 km (0.086 R)
• M19: 4,668,950 km (0.099 R)
• M20: 5,047,133 km (0.08 R)
• M21: 5,228,745 km (0.092 R)
• M22: 5,366,225 km (0.086 R)
• M23: 5,551,577 km (0.115 R)
• M24: 6,411,466 km (0.041 R)
• M25: 6,485,068 km (0.094 R)
• M26: 6,558,969 km (0.11 R)
• M27: 6,907,233 km (0.117 R)
• M28: 7,622,161 km (0.032 R)
• M29: 7,804,521 km (0.114 R)
• M30: 7,962,047 km (0.114 R)
• M31: 8,147,250 km (0.071 R)
• M32: 8,226,985 km (0.094 R)
• M33: 8,307,020 km (0.026 R)
• M34: 8,656,930 km (0.095 R)
• M35: 9,315,609 km (0.067 R)
• M36: 9,566,784 km (0.073 R)
• M37: 9,905,324 km (0.102 R)
• M38: 10,019,018 km (0.112 R)
• M39: 10,681,138 km (0.045 R)
• M40: 11,120,657 km (0.119 R)
• M41: 11,685,838 km (0.084 R)
• M42: 11,956,909 km (0.119 R)
• M43: 12,078,083 km (0.114 R)
• M44: 12,413,183 km (0.074 R)
• M45: 12,720,606 km (0.066 R)
• M46: 13,343,083 km (0.109 R)
• M47: 13,437,330 km (0.086 R)
• M48: 13,816,411 km (0.115 R)
• M49: 13,911,704 km (0.117 R)
• M50: 14,263,110 km (0.095 R)
• M51: 14,520,568 km (0.043 R)
• M52: 14,877,059 km (0.092 R)
• M53: 15,236,543 km (0.12 R)
• M54: 15,367,890 km (0.094 R)
• M55: 15,532,747 km (0.084 R)
• M56: 15,830,746 km (0.073 R)
• M57: 16,500,047 km (0.029 R)
• M58: 16,702,602 km (0.088 R)
• M59: 16,804,329 km (0.079 R)
• M60: 17,246,989 km (0.117 R)
• M61: 17,658,981 km (0.074 R)
• M62: 18,004,852 km (0.108 R)
• M63: 18,773,635 km (0.11 R)
• M64: 21,584,729 km (0.069 R)
• M65: 21,917,434 km (0.109 R)
• M66: 21,991,635 km (0.033 R)
• M67: 22,401,084 km (0.09 R)
• M68: 22,925,874 km (0.109 R)
• M69: 23,454,702 km (0.119 R)
• M70: 23,682,689 km (0.054 R)
• M71: 23,949,422 km (0.112 R)
• M72: 24,025,867 km (0.052 R)
• M73: 24,601,519 km (0.032 R)
• M74: 25,923,217 km (0.095 R)

Planet 6 - Gas Giant

Semi-Major Axis: 5.06 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 925.2

Radius: 12.3

Gravity: 6.12 G

Time & Orbit

Eccentricity (e): 0.17

Orbit Range: 4.2 AU - 5.92 AU

Year: 4265 Days

Day: 10.3 Hours

Environment

Temp: -148 °C

Axial Tilt: 156.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (74)

Outer Limit: 110,097,414 km

• M1: 182,809 km (0.112 R)
• M2: 365,617 km (0.102 R)
• M3: 496,964 km (0.086 R)
• M4: 636,539 km (0.077 R)
• M5: 718,070 km (0.079 R)
• M6: 803,640 km (0.105 R)
• M7: 880,234 km (0.106 R)
• M8: 972,985 km (0.091 R)
• M9: 1,154,746 km (0.091 R)
• M10: 1,287,589 km (0.094 R)
• M11: 1,410,110 km (0.114 R)
• M12: 1,520,812 km (0.119 R)
• M13: 2,228,111 km (0.086 R)
• M14: 2,434,107 km (0.117 R)
• M15: 3,027,412 km (0.111 R)
• M16: 3,256,297 km (0.06 R)
• M17: 3,404,848 km (0.081 R)
• M18: 3,534,100 km (0.076 R)
• M19: 3,864,263 km (0.086 R)
• M20: 3,976,611 km (0.092 R)
• M21: 4,112,894 km (0.1 R)
• M22: 4,507,683 km (0.11 R)
• M23: 4,745,544 km (0.079 R)
• M24: 4,841,885 km (0.116 R)
• M25: 5,918,690 km (0.095 R)
• M26: 6,179,589 km (0.103 R)
• M27: 6,284,906 km (0.082 R)
• M28: 6,497,634 km (0.048 R)
• M29: 7,794,647 km (0.073 R)
• M30: 7,965,937 km (0.072 R)
• M31: 8,841,234 km (0.08 R)
• M32: 8,930,394 km (0.088 R)
• M33: 9,079,693 km (0.034 R)
• M34: 9,229,889 km (0.107 R)
• M35: 9,320,396 km (0.065 R)
• M36: 10,086,337 km (0.086 R)
• M37: 10,587,041 km (0.086 R)
• M38: 12,536,451 km (0.081 R)
• M39: 12,771,170 km (0.102 R)
• M40: 13,586,479 km (0.081 R)
• M41: 13,862,038 km (0.115 R)
• M42: 14,104,686 km (0.071 R)
• M43: 15,160,398 km (0.106 R)
• M44: 15,374,622 km (0.09 R)
• M45: 15,482,183 km (0.103 R)
• M46: 15,697,903 km (0.114 R)
• M47: 16,059,631 km (0.111 R)
• M48: 16,241,691 km (0.036 R)
• M49: 16,424,201 km (0.096 R)
• M50: 17,496,817 km (0.116 R)
• M51: 19,167,227 km (0.089 R)
• M52: 19,244,420 km (0.086 R)
• M53: 19,982,386 km (0.081 R)
• M54: 20,927,845 km (0.073 R)
• M55: 21,286,131 km (0.054 R)
• M56: 21,405,959 km (0.108 R)
• M57: 21,606,271 km (0.058 R)
• M58: 21,726,697 km (0.112 R)
• M59: 22,617,104 km (0.069 R)
• M60: 22,902,985 km (0.074 R)
• M61: 23,066,795 km (0.078 R)
• M62: 23,395,761 km (0.116 R)
• M63: 24,350,045 km (0.079 R)
• M64: 25,063,478 km (0.056 R)
• M65: 25,869,062 km (0.058 R)
• M66: 26,210,893 km (0.092 R)
• M67: 26,339,398 km (0.098 R)
• M68: 26,769,342 km (0.091 R)
• M69: 26,898,894 km (0.057 R)
• M70: 27,201,680 km (0.051 R)
• M71: 29,086,912 km (0.119 R)
• M72: 29,175,624 km (0.099 R)
• M73: 29,531,368 km (0.114 R)
• M74: 29,754,418 km (0.113 R)

Planet 7 - Gas Giant

Semi-Major Axis: 11.09 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 88.4

Radius: 10.5

Gravity: 0.8 G

Time & Orbit

Eccentricity (e): 0.246

Orbit Range: 8.36 AU - 13.82 AU

Year: 13840 Days

Day: 9.8 Hours

Environment

Temp: -187 °C

Axial Tilt: 43.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (69)

Outer Limit: 110,097,414 km

• M1: 496,067 km (0.048 R)
• M2: 615,446 km (0.06 R)
• M3: 1,077,703 km (0.049 R)
• M4: 1,223,262 km (0.112 R)
• M5: 2,992,406 km (0.05 R)
• M6: 3,718,405 km (0.104 R)
• M7: 3,874,435 km (0.105 R)
• M8: 4,010,121 km (0.095 R)
• M9: 4,101,375 km (0.098 R)
• M10: 4,285,979 km (0.09 R)
• M11: 4,568,270 km (0.114 R)
• M12: 4,759,755 km (0.066 R)
• M13: 4,856,545 km (0.082 R)
• M14: 5,101,437 km (0.056 R)
• M15: 5,175,638 km (0.09 R)
• M16: 5,552,325 km (0.036 R)
• M17: 5,808,437 km (0.1 R)
• M18: 6,042,258 km (0.12 R)
• M19: 6,492,548 km (0.11 R)
• M20: 6,789,649 km (0.042 R)
• M21: 8,137,975 km (0.058 R)
• M22: 9,081,638 km (0.094 R)
• M23: 9,383,676 km (0.099 R)
• M24: 9,627,820 km (0.119 R)
• M25: 10,153,357 km (0.11 R)
• M26: 10,656,455 km (0.085 R)
• M27: 10,783,613 km (0.105 R)
• M28: 11,232,257 km (0.115 R)
• M29: 11,426,435 km (0.028 R)
• M30: 12,148,095 km (0.076 R)
• M31: 12,480,950 km (0.113 R)
• M32: 12,952,034 km (0.09 R)
• M33: 13,223,853 km (0.067 R)
• M34: 13,463,210 km (0.046 R)
• M35: 13,566,283 km (0.09 R)
• M36: 13,911,704 km (0.1 R)
• M37: 14,259,968 km (0.098 R)
• M38: 14,540,763 km (0.108 R)
• M39: 15,178,948 km (0.075 R)
• M40: 15,609,640 km (0.097 R)
• M41: 16,446,192 km (0.087 R)
• M42: 16,519,644 km (0.104 R)
• M43: 16,962,603 km (0.072 R)
• M44: 17,822,492 km (0.092 R)
• M45: 18,658,295 km (0.115 R)
• M46: 19,662,396 km (0.074 R)
• M47: 19,857,472 km (0.12 R)
• M48: 19,974,906 km (0.071 R)
• M49: 20,249,717 km (0.085 R)
• M50: 20,446,738 km (0.083 R)
• M51: 21,281,344 km (0.103 R)
• M52: 22,370,716 km (0.098 R)
• M53: 22,983,618 km (0.097 R)
• M54: 23,726,671 km (0.09 R)
• M55: 24,142,703 km (0.08 R)
• M56: 25,533,065 km (0.104 R)
• M57: 25,618,187 km (0.102 R)
• M58: 25,959,569 km (0.091 R)
• M59: 26,517,419 km (0.119 R)
• M60: 26,949,308 km (0.069 R)
• M61: 27,645,238 km (0.081 R)
• M62: 27,776,285 km (0.096 R)
• M63: 28,126,943 km (0.064 R)
• M64: 28,699,903 km (0.032 R)
• M65: 28,832,746 km (0.08 R)
• M66: 29,232,322 km (0.052 R)
• M67: 29,588,963 km (0.058 R)
• M68: 29,678,422 km (0.117 R)
• M69: 29,947,100 km (0.071 R)

Planet 8 - Ice Giant

Semi-Major Axis: 15.2 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 208.9

Radius: 4.6

Gravity: 9.87 G

Time & Orbit

Eccentricity (e): 0.138

Orbit Range: 13.1 AU - 17.3 AU

Year: 22207 Days

Day: 15.6 Hours

Environment

Temp: -205 °C

Axial Tilt: 21 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (87)

Outer Limit: 110,097,414 km

• M1: 178,769 km (0.091 R)
• M2: 447,597 km (0.06 R)
• M3: 745,596 km (0.112 R)
• M4: 803,789 km (0.112 R)
• M5: 843,433 km (0.119 R)
• M6: 987,346 km (0.085 R)
• M7: 1,465,012 km (0.112 R)
• M8: 1,688,960 km (0.072 R)
• M9: 2,031,389 km (0.059 R)
• M10: 2,113,519 km (0.102 R)
• M11: 2,366,339 km (0.108 R)
• M12: 2,658,354 km (0.089 R)
• M13: 3,535,446 km (0.096 R)
• M14: 3,936,518 km (0.107 R)
• M15: 4,107,958 km (0.102 R)
• M16: 4,142,515 km (0.08 R)
• M17: 4,246,784 km (0.083 R)
• M18: 4,316,796 km (0.106 R)
• M19: 4,351,952 km (0.11 R)
• M20: 4,636,636 km (0.117 R)
• M21: 5,299,056 km (0.077 R)
• M22: 5,336,605 km (0.082 R)
• M23: 6,029,841 km (0.102 R)
• M24: 6,547,749 km (0.114 R)
• M25: 7,330,296 km (0.09 R)
• M26: 7,372,333 km (0.11 R)
• M27: 7,626,051 km (0.099 R)
• M28: 10,268,547 km (0.077 R)
• M29: 10,551,886 km (0.063 R)
• M30: 10,789,746 km (0.109 R)
• M31: 11,174,213 km (0.093 R)
• M32: 12,404,207 km (0.108 R)
• M33: 12,504,437 km (0.11 R)
• M34: 12,655,381 km (0.047 R)
• M35: 13,060,642 km (0.072 R)
• M36: 14,092,419 km (0.071 R)
• M37: 14,883,193 km (0.093 R)
• M38: 16,452,624 km (0.081 R)
• M39: 16,673,131 km (0.098 R)
• M40: 17,117,138 km (0.104 R)
• M41: 17,396,736 km (0.087 R)
• M42: 17,677,681 km (0.103 R)
• M43: 17,903,574 km (0.119 R)
• M44: 19,221,082 km (0.077 R)
• M45: 19,628,138 km (0.046 R)
• M46: 19,979,394 km (0.073 R)
• M47: 21,284,785 km (0.06 R)
• M48: 21,887,216 km (0.105 R)
• M49: 22,190,600 km (0.097 R)
• M50: 22,678,888 km (0.079 R)
• M51: 22,740,073 km (0.107 R)
• M52: 22,985,713 km (0.099 R)
• M53: 24,856,135 km (0.034 R)
• M54: 25,745,494 km (0.107 R)
• M55: 26,904,279 km (0.078 R)
• M56: 27,686,228 km (0.109 R)
• M57: 28,409,533 km (0.118 R)
• M58: 28,607,900 km (0.113 R)
• M59: 28,872,987 km (0.066 R)
• M60: 29,606,466 km (0.05 R)
• M61: 30,413,546 km (0.088 R)
• M62: 30,616,401 km (0.115 R)
• M63: 31,023,606 km (0.117 R)
• M64: 31,980,584 km (0.119 R)
• M65: 32,393,624 km (0.089 R)
• M66: 32,670,081 km (0.048 R)
• M67: 34,063,585 km (0.044 R)
• M68: 35,761,371 km (0.113 R)
• M69: 36,261,776 km (0.092 R)
• M70: 36,405,091 km (0.092 R)
• M71: 36,908,487 km (0.11 R)
• M72: 38,798,058 km (0.113 R)
• M73: 39,533,182 km (0.072 R)
• M74: 42,443,758 km (0.118 R)
• M75: 44,039,220 km (0.09 R)
• M76: 44,422,041 km (0.076 R)
• M77: 44,575,528 km (0.101 R)
• M78: 45,036,738 km (0.045 R)
• M79: 46,274,661 km (0.052 R)
• M80: 46,585,974 km (0.105 R)
• M81: 48,546,753 km (0.112 R)
• M82: 51,739,770 km (0.111 R)
• M83: 51,901,186 km (0.097 R)
• M84: 51,981,969 km (0.05 R)
• M85: 53,933,174 km (0.11 R)
• M86: 54,015,004 km (0.06 R)
• M87: 54,670,991 km (0.098 R)

Planet 9 - Ice Giant

Semi-Major Axis: 19.08 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 851

Radius: 4.9

Gravity: 35.44 G

Time & Orbit

Eccentricity (e): 0.108

Orbit Range: 17.02 AU - 21.14 AU

Year: 31232 Days

Day: 15.7 Hours

Environment

Temp: -207 °C

Axial Tilt: 7.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (96)

Outer Limit: 110,097,414 km

• M1: 112,049 km (0.058 R)
• M2: 326,722 km (0.053 R)
• M3: 1,441,675 km (0.118 R)
• M4: 2,366,339 km (0.113 R)
• M5: 3,488,473 km (0.071 R)
• M6: 3,698,359 km (0.11 R)
• M7: 4,692,436 km (0.092 R)
• M8: 4,923,864 km (0.087 R)
• M9: 4,982,357 km (0.116 R)
• M10: 5,338,101 km (0.088 R)
• M11: 5,579,701 km (0.084 R)
• M12: 5,763,408 km (0.095 R)
• M13: 6,453,503 km (0.027 R)
• M14: 7,169,328 km (0.092 R)
• M15: 8,464,098 km (0.044 R)
• M16: 9,609,120 km (0.1 R)
• M17: 10,274,232 km (0.093 R)
• M18: 10,650,172 km (0.113 R)
• M19: 13,486,697 km (0.113 R)
• M20: 14,817,669 km (0.11 R)
• M21: 15,071,836 km (0.12 R)
• M22: 16,714,720 km (0.096 R)
• M23: 17,334,204 km (0.114 R)
• M24: 18,141,734 km (0.108 R)
• M25: 18,322,897 km (0.08 R)
• M26: 18,413,703 km (0.075 R)
• M27: 19,514,593 km (0.102 R)
• M28: 20,260,488 km (0.113 R)
• M29: 21,110,504 km (0.067 R)
• M30: 21,492,128 km (0.067 R)
• M31: 24,126,546 km (0.115 R)
• M32: 24,325,661 km (0.095 R)
• M33: 24,625,455 km (0.107 R)
• M34: 27,689,668 km (0.102 R)
• M35: 28,107,196 km (0.064 R)
• M36: 28,948,534 km (0.117 R)
• M37: 29,266,280 km (0.084 R)
• M38: 29,585,073 km (0.044 R)
• M39: 30,118,988 km (0.059 R)
• M40: 32,725,432 km (0.072 R)
• M41: 35,742,970 km (0.108 R)
• M42: 36,882,906 km (0.049 R)
• M43: 38,382,625 km (0.098 R)
• M44: 39,667,072 km (0.117 R)
• M45: 39,902,090 km (0.061 R)
• M46: 41,799,141 km (0.069 R)
• M47: 42,638,236 km (0.093 R)
• M48: 43,241,115 km (0.098 R)
• M49: 44,455,102 km (0.072 R)
• M50: 46,049,965 km (0.088 R)
• M51: 49,043,268 km (0.104 R)
• M52: 50,181,858 km (0.1 R)
• M53: 51,073,461 km (0.092 R)
• M54: 52,485,067 km (0.085 R)
• M55: 54,169,838 km (0.079 R)
• M56: 54,561,186 km (0.076 R)
• M57: 55,740,615 km (0.112 R)
• M58: 56,796,178 km (0.106 R)
• M59: 57,326,502 km (0.106 R)
• M60: 60,542,109 km (0.042 R)
• M61: 61,083,803 km (0.113 R)
• M62: 61,626,992 km (0.115 R)
• M63: 61,762,977 km (0.117 R)
• M64: 63,815,908 km (0.117 R)
• M65: 65,335,524 km (0.107 R)
• M66: 66,587,658 km (0.096 R)
• M67: 66,727,233 km (0.077 R)
• M68: 67,988,193 km (0.102 R)
• M69: 68,128,665 km (0.106 R)
• M70: 69,115,563 km (0.098 R)
• M71: 69,398,303 km (0.098 R)
• M72: 70,107,097 km (0.111 R)
• M73: 71,388,852 km (0.12 R)
• M74: 71,674,733 km (0.099 R)
• M75: 73,253,889 km (0.025 R)
• M76: 79,535,952 km (0.109 R)
• M77: 80,574,760 km (0.071 R)
• M78: 82,516,091 km (0.05 R)
• M79: 82,816,035 km (0.086 R)
• M80: 84,926,412 km (0.062 R)
• M81: 87,818,438 km (0.098 R)
• M82: 88,278,003 km (0.111 R)
• M83: 89,199,675 km (0.041 R)
• M84: 91,052,445 km (0.119 R)
• M85: 91,207,279 km (0.106 R)
• M86: 94,481,826 km (0.091 R)
• M87: 94,638,755 km (0.098 R)
• M88: 95,267,215 km (0.065 R)
• M89: 96,844,276 km (0.083 R)
• M90: 102,592,873 km (0.052 R)
• M91: 104,209,278 km (0.067 R)
• M92: 104,695,771 km (0.091 R)
• M93: 106,812,880 km (0.096 R)
• M94: 106,976,390 km (0.045 R)
• M95: 108,286,867 km (0.108 R)
• M96: 109,108,609 km (0.04 R)

Kuiper Belt

Range: 30 - 53 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 252 - 18,953 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit