🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.55 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.9

Radius: 1.29

Gravity: 1.14 G

Time & Orbit

Eccentricity (e): 0.159

Orbit Range: 0.46 AU - 0.64 AU

Year: 263 Days

Day: 14.5 Hours

Environment

Temp: -120 °C

Axial Tilt: 48.3 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 2 - Terrestrial

Semi-Major Axis: 0.56 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.86

Radius: 1.28

Gravity: 1.14 G

Time & Orbit

Eccentricity (e): 0.115

Orbit Range: 0.5 AU - 0.62 AU

Year: 271 Days

Day: 44.3 Hours

Environment

Temp: -115 °C

Axial Tilt: 28.3 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 3 - Terrestrial

Semi-Major Axis: 0.64 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.8

Radius: 1.71

Gravity: 1.3 G

Time & Orbit

Eccentricity (e): 0.118

Orbit Range: 0.56 AU - 0.72 AU

Year: 331 Days

Day: 14.1 Hours

Environment

Temp: -142 °C

Axial Tilt: 33.4 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 4 - Gas Giant

Semi-Major Axis: 0.84 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 156.5

Radius: 14.2

Gravity: 0.78 G

Time & Orbit

Eccentricity (e): 0.03

Orbit Range: 0.81 AU - 0.87 AU

Year: 497 Days

Day: 13.9 Hours

Environment

Temp: -147 °C

Axial Tilt: 21.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (28)

Outer Limit: 42,079,679 km

• M1: 178,769 km (0.112 R)
• M2: 273,764 km (0.066 R)
• M3: 370,554 km (0.106 R)
• M4: 470,485 km (0.097 R)
• M5: 624,422 km (0.114 R)
• M6: 731,384 km (0.085 R)
• M7: 887,564 km (0.038 R)
• M8: 1,011,282 km (0.069 R)
• M9: 1,184,815 km (0.11 R)
• M10: 1,345,932 km (0.102 R)
• M11: 1,530,835 km (0.072 R)
• M12: 1,699,432 km (0.116 R)
• M13: 1,796,820 km (0.099 R)
• M14: 1,891,815 km (0.102 R)
• M15: 2,024,358 km (0.064 R)
• M16: 2,119,054 km (0.104 R)
• M17: 2,266,258 km (0.12 R)
• M18: 2,393,267 km (0.114 R)
• M19: 2,517,882 km (0.032 R)
• M20: 2,773,993 km (0.066 R)
• M21: 2,869,736 km (0.089 R)
• M22: 2,961,439 km (0.102 R)
• M23: 3,111,337 km (0.103 R)
• M24: 3,221,590 km (0.045 R)
• M25: 3,365,204 km (0.069 R)
• M26: 3,598,577 km (0.074 R)
• M27: 3,781,385 km (0.039 R)
• M28: 3,882,364 km (0.047 R)

Planet 5 - Gas Giant

Semi-Major Axis: 1.67 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 72.9

Radius: 9.6

Gravity: 0.79 G

Time & Orbit

Eccentricity (e): 0.232

Orbit Range: 1.28 AU - 2.06 AU

Year: 1393 Days

Day: 7.5 Hours

Environment

Temp: -181 °C

Axial Tilt: 32.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (44)

Outer Limit: 42,079,679 km

• M1: 126,261 km (0.099 R)
• M2: 254,765 km (0.052 R)
• M3: 328,966 km (0.113 R)
• M4: 426,204 km (0.093 R)
• M5: 517,010 km (0.067 R)
• M6: 691,292 km (0.057 R)
• M7: 849,716 km (0.098 R)
• M8: 922,121 km (0.114 R)
• M9: 991,983 km (0.084 R)
• M10: 1,059,003 km (0.107 R)
• M11: 1,147,565 km (0.032 R)
• M12: 1,243,906 km (0.036 R)
• M13: 1,342,940 km (0.093 R)
• M14: 1,488,499 km (0.107 R)
• M15: 1,554,920 km (0.042 R)
• M16: 1,742,815 km (0.108 R)
• M17: 1,818,961 km (0.075 R)
• M18: 1,908,270 km (0.078 R)
• M19: 2,054,278 km (0.116 R)
• M20: 2,128,778 km (0.104 R)
• M21: 2,204,025 km (0.112 R)
• M22: 2,429,021 km (0.105 R)
• M23: 2,554,384 km (0.112 R)
• M24: 2,729,264 km (0.111 R)
• M25: 2,929,276 km (0.049 R)
• M26: 3,041,624 km (0.098 R)
• M27: 3,162,649 km (0.045 R)
• M28: 3,270,808 km (0.107 R)
• M29: 3,475,907 km (0.081 R)
• M30: 3,898,969 km (0.102 R)
• M31: 4,085,368 km (0.096 R)
• M32: 4,475,071 km (0.095 R)
• M33: 4,547,925 km (0.114 R)
• M34: 4,686,752 km (0.081 R)
• M35: 4,760,653 km (0.079 R)
• M36: 4,826,925 km (0.111 R)
• M37: 5,043,991 km (0.105 R)
• M38: 5,145,269 km (0.075 R)
• M39: 5,281,403 km (0.106 R)
• M40: 5,444,615 km (0.091 R)
• M41: 5,565,938 km (0.066 R)
• M42: 5,670,806 km (0.064 R)
• M43: 5,793,776 km (0.086 R)
• M44: 6,078,311 km (0.105 R)

Planet 6 - Gas Giant

Semi-Major Axis: 1.86 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 550.6

Radius: 13.7

Gravity: 2.93 G

Time & Orbit

Eccentricity (e): 0.229

Orbit Range: 1.43 AU - 2.29 AU

Year: 1638 Days

Day: 7.3 Hours

Environment

Temp: -186 °C

Axial Tilt: 43.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (56)

Outer Limit: 42,079,679 km

• M1: 173,683 km (0.079 R)
• M2: 275,709 km (0.083 R)
• M3: 520,152 km (0.082 R)
• M4: 831,016 km (0.047 R)
• M5: 927,956 km (0.073 R)
• M6: 1,159,533 km (0.073 R)
• M7: 1,538,764 km (0.065 R)
• M8: 1,728,603 km (0.108 R)
• M9: 2,038,869 km (0.109 R)
• M10: 2,227,363 km (0.114 R)
• M11: 2,565,753 km (0.113 R)
• M12: 2,956,204 km (0.075 R)
• M13: 3,280,083 km (0.034 R)
• M14: 3,565,067 km (0.087 R)
• M15: 3,845,413 km (0.062 R)
• M16: 3,936,219 km (0.113 R)
• M17: 4,133,090 km (0.05 R)
• M18: 4,293,010 km (0.095 R)
• M19: 4,387,257 km (0.05 R)
• M20: 4,509,478 km (0.093 R)
• M21: 4,632,896 km (0.094 R)
• M22: 4,813,162 km (0.05 R)
• M23: 4,911,148 km (0.062 R)
• M24: 5,009,883 km (0.06 R)
• M25: 5,223,658 km (0.073 R)
• M26: 5,353,360 km (0.04 R)
• M27: 5,440,575 km (0.052 R)
• M28: 5,572,072 km (0.094 R)
• M29: 5,764,006 km (0.118 R)
• M30: 5,853,316 km (0.111 R)
• M31: 6,337,714 km (0.051 R)
• M32: 6,476,391 km (0.104 R)
• M33: 6,678,348 km (0.102 R)
• M34: 6,803,711 km (0.062 R)
• M35: 6,977,245 km (0.06 R)
• M36: 7,088,546 km (0.064 R)
• M37: 7,248,615 km (0.083 R)
• M38: 7,409,882 km (0.119 R)
• M39: 7,507,120 km (0.074 R)
• M40: 7,621,264 km (0.093 R)
• M41: 7,735,855 km (0.117 R)
• M42: 8,200,357 km (0.079 R)
• M43: 8,301,186 km (0.063 R)
• M44: 8,828,219 km (0.096 R)
• M45: 9,366,023 km (0.081 R)
• M46: 9,471,490 km (0.118 R)
• M47: 10,201,976 km (0.089 R)
• M48: 10,987,814 km (0.063 R)
• M49: 11,210,565 km (0.074 R)
• M50: 11,378,564 km (0.106 R)
• M51: 11,925,942 km (0.091 R)
• M52: 12,404,655 km (0.082 R)
• M53: 12,539,892 km (0.092 R)
• M54: 12,733,771 km (0.114 R)
• M55: 13,046,281 km (0.114 R)
• M56: 13,223,105 km (0.069 R)

Planet 7 - Gas Giant

Semi-Major Axis: 2.26 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 85.7

Radius: 14.8

Gravity: 0.39 G

Time & Orbit

Eccentricity (e): 0.22

Orbit Range: 1.76 AU - 2.76 AU

Year: 2194 Days

Day: 13.4 Hours

Environment

Temp: -184 °C

Axial Tilt: 13.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (42)

Outer Limit: 42,079,679 km

• M1: 219,909 km (0.113 R)
• M2: 332,107 km (0.043 R)
• M3: 508,334 km (0.106 R)
• M4: 674,986 km (0.061 R)
• M5: 814,261 km (0.087 R)
• M6: 930,349 km (0.093 R)
• M7: 1,168,958 km (0.089 R)
• M8: 1,263,803 km (0.11 R)
• M9: 1,415,046 km (0.115 R)
• M10: 1,537,866 km (0.09 R)
• M11: 1,758,224 km (0.049 R)
• M12: 1,928,915 km (0.052 R)
• M13: 2,081,804 km (0.103 R)
• M14: 2,287,052 km (0.116 R)
• M15: 2,384,141 km (0.109 R)
• M16: 2,658,354 km (0.031 R)
• M17: 2,795,236 km (0.079 R)
• M18: 3,085,007 km (0.119 R)
• M19: 3,247,321 km (0.078 R)
• M20: 3,486,977 km (0.049 R)
• M21: 3,703,894 km (0.04 R)
• M22: 3,935,022 km (0.08 R)
• M23: 4,042,583 km (0.086 R)
• M24: 4,210,881 km (0.119 R)
• M25: 4,740,158 km (0.043 R)
• M26: 4,844,428 km (0.087 R)
• M27: 5,002,254 km (0.074 R)
• M28: 5,377,295 km (0.105 R)
• M29: 5,661,831 km (0.098 R)
• M30: 5,817,263 km (0.074 R)
• M31: 6,166,275 km (0.108 R)
• M32: 6,280,418 km (0.112 R)
• M33: 6,429,866 km (0.074 R)
• M34: 6,685,379 km (0.069 R)
• M35: 6,967,970 km (0.079 R)
• M36: 7,075,082 km (0.114 R)
• M37: 7,864,360 km (0.085 R)
• M38: 7,963,394 km (0.11 R)
• M39: 8,100,276 km (0.052 R)
• M40: 8,200,506 km (0.074 R)
• M41: 8,477,861 km (0.116 R)
• M42: 8,681,613 km (0.117 R)

Planet 8 - Gas Giant

Semi-Major Axis: 3.13 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 616.3

Radius: 11.4

Gravity: 4.74 G

Time & Orbit

Eccentricity (e): 0.115

Orbit Range: 2.77 AU - 3.49 AU

Year: 3575 Days

Day: 11.4 Hours

Environment

Temp: -200 °C

Axial Tilt: 106 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (71)

Outer Limit: 42,079,679 km

• M1: 142,567 km (0.094 R)
• M2: 250,277 km (0.037 R)
• M3: 341,233 km (0.094 R)
• M4: 424,409 km (0.115 R)
• M5: 516,861 km (0.114 R)
• M6: 675,883 km (0.114 R)
• M7: 767,287 km (0.07 R)
• M8: 863,479 km (0.102 R)
• M9: 952,639 km (0.081 R)
• M10: 1,215,184 km (0.104 R)
• M11: 1,303,745 km (0.069 R)
• M12: 1,555,668 km (0.087 R)
• M13: 1,808,937 km (0.05 R)
• M14: 1,925,923 km (0.117 R)
• M15: 2,060,561 km (0.101 R)
• M16: 2,630,978 km (0.063 R)
• M17: 3,003,177 km (0.092 R)
• M18: 3,090,243 km (0.116 R)
• M19: 3,231,164 km (0.083 R)
• M20: 3,392,281 km (0.114 R)
• M21: 3,797,542 km (0.099 R)
• M22: 4,102,123 km (0.11 R)
• M23: 4,179,465 km (0.048 R)
• M24: 4,614,047 km (0.047 R)
• M25: 5,356,202 km (0.097 R)
• M26: 5,612,015 km (0.036 R)
• M27: 5,871,716 km (0.118 R)
• M28: 6,179,738 km (0.105 R)
• M29: 6,515,885 km (0.034 R)
• M30: 7,346,602 km (0.044 R)
• M31: 7,440,998 km (0.109 R)
• M32: 7,798,537 km (0.074 R)
• M33: 7,991,668 km (0.1 R)
• M34: 8,804,583 km (0.097 R)
• M35: 9,056,057 km (0.044 R)
• M36: 9,259,061 km (0.077 R)
• M37: 9,515,023 km (0.064 R)
• M38: 9,669,558 km (0.065 R)
• M39: 10,402,288 km (0.106 R)
• M40: 10,963,579 km (0.034 R)
• M41: 11,425,238 km (0.068 R)
• M42: 11,617,172 km (0.059 R)
• M43: 11,754,952 km (0.114 R)
• M44: 13,248,387 km (0.079 R)
• M45: 14,002,660 km (0.12 R)
• M46: 14,355,561 km (0.119 R)
• M47: 15,826,856 km (0.113 R)
• M48: 16,102,266 km (0.057 R)
• M49: 16,441,105 km (0.115 R)
• M50: 16,534,005 km (0.04 R)
• M51: 16,688,989 km (0.119 R)
• M52: 17,000,601 km (0.056 R)
• M53: 17,157,230 km (0.051 R)
• M54: 17,251,327 km (0.039 R)
• M55: 17,471,685 km (0.115 R)
• M56: 17,598,095 km (0.099 R)
• M57: 17,756,370 km (0.089 R)
• M58: 17,851,664 km (0.111 R)
• M59: 18,106,429 km (0.108 R)
• M60: 18,362,540 km (0.111 R)
• M61: 18,490,895 km (0.039 R)
• M62: 18,813,428 km (0.092 R)
• M63: 19,170,369 km (0.052 R)
• M64: 19,268,056 km (0.114 R)
• M65: 19,398,505 km (0.098 R)
• M66: 20,653,482 km (0.118 R)
• M67: 21,527,283 km (0.1 R)
• M68: 21,798,504 km (0.065 R)
• M69: 22,515,976 km (0.086 R)
• M70: 22,860,350 km (0.069 R)
• M71: 23,137,106 km (0.09 R)

Planet 9 - Gas Giant

Semi-Major Axis: 4.87 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 319.5

Radius: 12.1

Gravity: 2.18 G

Time & Orbit

Eccentricity (e): 0.202

Orbit Range: 3.89 AU - 5.85 AU

Year: 6939 Days

Day: 12.9 Hours

Environment

Temp: -210 °C

Axial Tilt: 11.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (78)

Outer Limit: 42,079,679 km

• M1: 245,041 km (0.101 R)
• M2: 400,025 km (0.074 R)
• M3: 769,831 km (0.111 R)
• M4: 1,400,834 km (0.117 R)
• M5: 1,834,369 km (0.054 R)
• M6: 1,953,599 km (0.107 R)
• M7: 2,040,515 km (0.111 R)
• M8: 2,182,184 km (0.11 R)
• M9: 2,382,496 km (0.112 R)
• M10: 2,665,684 km (0.06 R)
• M11: 2,821,266 km (0.098 R)
• M12: 2,900,104 km (0.081 R)
• M13: 3,326,907 km (0.111 R)
• M14: 3,431,476 km (0.076 R)
• M15: 3,751,915 km (0.089 R)
• M16: 3,904,953 km (0.081 R)
• M17: 4,285,081 km (0.115 R)
• M18: 4,583,828 km (0.114 R)
• M19: 5,080,942 km (0.101 R)
• M20: 5,471,393 km (0.048 R)
• M21: 5,770,738 km (0.097 R)
• M22: 6,780,075 km (0.077 R)
• M23: 6,940,294 km (0.104 R)
• M24: 7,128,787 km (0.102 R)
• M25: 7,210,019 km (0.105 R)
• M26: 7,428,432 km (0.081 R)
• M27: 7,566,062 km (0.091 R)
• M28: 7,760,090 km (0.107 R)
• M29: 7,955,764 km (0.038 R)
• M30: 8,040,138 km (0.116 R)
• M31: 9,017,311 km (0.046 R)
• M32: 9,311,869 km (0.106 R)
• M33: 9,430,650 km (0.115 R)
• M34: 9,549,879 km (0.101 R)
• M35: 9,639,488 km (0.053 R)
• M36: 10,184,025 km (0.118 R)
• M37: 10,738,584 km (0.1 R)
• M38: 11,113,626 km (0.09 R)
• M39: 11,620,613 km (0.071 R)
• M40: 12,689,939 km (0.041 R)
• M41: 12,821,734 km (0.044 R)
• M42: 13,219,665 km (0.118 R)
• M43: 13,655,443 km (0.07 R)
• M44: 13,824,339 km (0.081 R)
• M45: 13,926,066 km (0.052 R)
• M46: 14,438,139 km (0.086 R)
• M47: 14,575,769 km (0.098 R)
• M48: 15,060,766 km (0.059 R)
• M49: 15,200,340 km (0.11 R)
• M50: 15,833,738 km (0.085 R)
• M51: 16,153,728 km (0.082 R)
• M52: 16,944,801 km (0.115 R)
• M53: 17,053,559 km (0.085 R)
• M54: 17,381,627 km (0.086 R)
• M55: 17,674,839 km (0.115 R)
• M56: 18,192,148 km (0.09 R)
• M57: 18,639,446 km (0.059 R)
• M58: 19,241,428 km (0.1 R)
• M59: 19,392,970 km (0.098 R)
• M60: 19,468,816 km (0.113 R)
• M61: 19,964,733 km (0.095 R)
• M62: 20,118,071 km (0.07 R)
• M63: 20,464,690 km (0.094 R)
• M64: 21,437,824 km (0.095 R)
• M65: 21,910,254 km (0.097 R)
• M66: 21,989,241 km (0.083 R)
• M67: 23,146,680 km (0.116 R)
• M68: 23,996,994 km (0.115 R)
• M69: 24,078,525 km (0.059 R)
• M70: 24,446,536 km (0.091 R)
• M71: 25,188,242 km (0.115 R)
• M72: 25,478,612 km (0.115 R)
• M73: 25,561,788 km (0.055 R)
• M74: 25,895,391 km (0.108 R)
• M75: 27,074,522 km (0.089 R)
• M76: 28,056,033 km (0.109 R)
• M77: 28,314,090 km (0.072 R)
• M78: 28,400,258 km (0.117 R)

Planet 10 - Ice Giant

Semi-Major Axis: 7.21 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 296.6

Radius: 6.5

Gravity: 7.02 G

Time & Orbit

Eccentricity (e): 0.075

Orbit Range: 6.67 AU - 7.75 AU

Year: 12500 Days

Day: 17.6 Hours

Environment

Temp: -217 °C

Axial Tilt: 36.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (71)

Outer Limit: 42,079,679 km

• M1: 95,743 km (0.105 R)
• M2: 256,860 km (0.048 R)
• M3: 321,187 km (0.106 R)
• M4: 367,712 km (0.059 R)
• M5: 622,626 km (0.104 R)
• M6: 760,855 km (0.116 R)
• M7: 1,085,183 km (0.096 R)
• M8: 1,634,058 km (0.083 R)
• M9: 2,049,341 km (0.114 R)
• M10: 2,164,083 km (0.074 R)
• M11: 2,257,282 km (0.032 R)
• M12: 2,304,555 km (0.027 R)
• M13: 2,447,870 km (0.098 R)
• M14: 2,768,757 km (0.069 R)
• M15: 3,234,904 km (0.09 R)
• M16: 3,641,811 km (0.097 R)
• M17: 3,781,086 km (0.058 R)
• M18: 3,922,157 km (0.066 R)
• M19: 3,979,004 km (0.09 R)
• M20: 4,773,967 km (0.061 R)
• M21: 4,895,890 km (0.108 R)
• M22: 5,713,143 km (0.056 R)
• M23: 6,203,674 km (0.106 R)
• M24: 6,504,515 km (0.053 R)
• M25: 7,155,266 km (0.11 R)
• M26: 7,400,158 km (0.064 R)
• M27: 7,612,288 km (0.04 R)
• M28: 9,342,237 km (0.112 R)
• M29: 9,418,532 km (0.084 R)
• M30: 9,725,507 km (0.103 R)
• M31: 10,309,836 km (0.074 R)
• M32: 10,467,662 km (0.12 R)
• M33: 10,865,593 km (0.078 R)
• M34: 12,255,207 km (0.119 R)
• M35: 14,047,689 km (0.107 R)
• M36: 14,091,371 km (0.084 R)
• M37: 14,135,054 km (0.086 R)
• M38: 14,885,138 km (0.102 R)
• M39: 15,377,315 km (0.099 R)
• M40: 16,285,972 km (0.066 R)
• M41: 19,162,590 km (0.065 R)
• M42: 19,502,626 km (0.1 R)
• M43: 19,648,932 km (0.104 R)
• M44: 20,435,518 km (0.115 R)
• M45: 20,832,700 km (0.071 R)
• M46: 21,382,921 km (0.099 R)
• M47: 21,887,365 km (0.114 R)
• M48: 21,937,929 km (0.099 R)
• M49: 23,735,348 km (0.102 R)
• M50: 23,839,468 km (0.083 R)
• M51: 24,152,726 km (0.12 R)
• M52: 24,889,047 km (0.113 R)
• M53: 25,153,835 km (0.113 R)
• M54: 25,793,066 km (0.081 R)
• M55: 26,114,702 km (0.074 R)
• M56: 28,458,302 km (0.093 R)
• M57: 28,901,710 km (0.063 R)
• M58: 30,020,104 km (0.104 R)
• M59: 30,981,869 km (0.085 R)
• M60: 32,011,252 km (0.109 R)
• M61: 32,241,483 km (0.079 R)
• M62: 32,356,823 km (0.11 R)
• M63: 33,168,092 km (0.111 R)
• M64: 33,693,180 km (0.111 R)
• M65: 34,338,546 km (0.104 R)
• M66: 36,960,847 km (0.116 R)
• M67: 38,296,008 km (0.079 R)
• M68: 39,153,802 km (0.113 R)
• M69: 39,770,444 km (0.116 R)
• M70: 41,075,686 km (0.115 R)
• M71: 41,200,750 km (0.071 R)

Kuiper Belt

Range: 30 - 56 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 379 - 11,171 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit