🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.29 AU

Composition

Type: Inner System (Rocky)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Terrestrial

Semi-Major Axis: 0.57 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.72

Radius: 0.88

Gravity: 0.93 G

Time & Orbit

Eccentricity (e): 0.096

Orbit Range: 0.52 AU - 0.62 AU

Year: 274 Days

Day: 13.3 Hours

Environment

Temp: -127 °C

Axial Tilt: 26.1 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 2 - Gas Giant

Semi-Major Axis: 1.07 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 956.5

Radius: 14.1

Gravity: 4.81 G

Time & Orbit

Eccentricity (e): 0.248

Orbit Range: 0.8 AU - 1.34 AU

Year: 704 Days

Day: 11.9 Hours

Environment

Temp: -164 °C

Axial Tilt: 5.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (51)

Outer Limit: 62,777,820 km

• M1: 176,825 km (0.104 R)
• M2: 269,575 km (0.065 R)
• M3: 393,442 km (0.114 R)
• M4: 493,224 km (0.104 R)
• M5: 624,571 km (0.116 R)
• M6: 721,959 km (0.117 R)
• M7: 836,701 km (0.119 R)
• M8: 934,837 km (0.099 R)
• M9: 1,189,153 km (0.115 R)
• M10: 1,328,728 km (0.113 R)
• M11: 1,418,038 km (0.057 R)
• M12: 1,516,623 km (0.119 R)
• M13: 1,743,862 km (0.112 R)
• M14: 2,037,972 km (0.1 R)
• M15: 2,126,085 km (0.118 R)
• M16: 2,273,439 km (0.107 R)
• M17: 2,526,708 km (0.101 R)
• M18: 2,665,684 km (0.089 R)
• M19: 2,789,551 km (0.079 R)
• M20: 3,126,147 km (0.108 R)
• M21: 3,238,046 km (0.09 R)
• M22: 3,582,420 km (0.092 R)
• M23: 3,989,326 km (0.027 R)
• M24: 4,080,581 km (0.076 R)
• M25: 4,224,195 km (0.042 R)
• M26: 4,390,249 km (0.101 R)
• M27: 4,516,210 km (0.032 R)
• M28: 4,643,518 km (0.054 R)
• M29: 4,804,336 km (0.076 R)
• M30: 4,912,495 km (0.112 R)
• M31: 5,253,279 km (0.083 R)
• M32: 5,353,659 km (0.088 R)
• M33: 5,533,775 km (0.093 R)
• M34: 5,624,581 km (0.107 R)
• M35: 5,819,208 km (0.086 R)
• M36: 6,027,897 km (0.066 R)
• M37: 6,144,882 km (0.084 R)
• M38: 6,286,252 km (0.1 R)
• M39: 6,392,915 km (0.096 R)
• M40: 6,632,422 km (0.118 R)
• M41: 6,741,179 km (0.109 R)
• M42: 6,850,386 km (0.084 R)
• M43: 6,972,607 km (0.042 R)
• M44: 7,144,944 km (0.12 R)
• M45: 7,418,558 km (0.12 R)
• M46: 7,886,650 km (0.093 R)
• M47: 8,156,525 km (0.114 R)
• M48: 8,312,106 km (0.077 R)
• M49: 8,586,918 km (0.091 R)
• M50: 8,904,664 km (0.119 R)
• M51: 9,024,791 km (0.035 R)

Planet 3 - Gas Giant

Semi-Major Axis: 1.29 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 444.8

Radius: 14

Gravity: 2.27 G

Time & Orbit

Eccentricity (e): 0.124

Orbit Range: 1.13 AU - 1.45 AU

Year: 932 Days

Day: 12.8 Hours

Environment

Temp: -172 °C

Axial Tilt: 10.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (50)

Outer Limit: 62,777,820 km

• M1: 191,036 km (0.064 R)
• M2: 279,000 km (0.093 R)
• M3: 377,585 km (0.094 R)
• M4: 479,012 km (0.116 R)
• M5: 645,066 km (0.105 R)
• M6: 791,074 km (0.026 R)
• M7: 888,013 km (0.084 R)
• M8: 1,012,927 km (0.079 R)
• M9: 1,243,757 km (0.075 R)
• M10: 1,392,307 km (0.07 R)
• M11: 1,512,883 km (0.08 R)
• M12: 1,686,716 km (0.107 R)
• M13: 1,808,788 km (0.081 R)
• M14: 1,941,481 km (0.106 R)
• M15: 2,108,283 km (0.038 R)
• M16: 2,287,950 km (0.031 R)
• M17: 2,464,775 km (0.1 R)
• M18: 2,579,666 km (0.029 R)
• M19: 2,747,066 km (0.106 R)
• M20: 2,961,439 km (0.091 R)
• M21: 3,128,241 km (0.111 R)
• M22: 3,307,310 km (0.098 R)
• M23: 3,508,220 km (0.117 R)
• M24: 3,694,469 km (0.105 R)
• M25: 3,884,010 km (0.113 R)
• M26: 4,125,610 km (0.076 R)
• M27: 4,263,091 km (0.044 R)
• M28: 4,352,251 km (0.103 R)
• M29: 4,512,470 km (0.104 R)
• M30: 4,644,116 km (0.094 R)
• M31: 4,777,109 km (0.101 R)
• M32: 4,973,680 km (0.112 R)
• M33: 5,151,851 km (0.071 R)
• M34: 5,257,617 km (0.065 R)
• M35: 5,385,673 km (0.111 R)
• M36: 5,568,781 km (0.115 R)
• M37: 5,666,468 km (0.088 R)
• M38: 5,764,904 km (0.112 R)
• M39: 5,852,867 km (0.054 R)
• M40: 5,941,130 km (0.065 R)
• M41: 6,141,741 km (0.097 R)
• M42: 6,321,856 km (0.11 R)
• M43: 6,641,397 km (0.113 R)
• M44: 6,826,450 km (0.059 R)
• M45: 7,107,096 km (0.061 R)
• M46: 7,439,502 km (0.117 R)
• M47: 7,619,618 km (0.08 R)
• M48: 7,923,152 km (0.109 R)
• M49: 8,243,142 km (0.08 R)
• M50: 8,392,291 km (0.045 R)

Planet 4 - Gas Giant

Semi-Major Axis: 1.93 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 428.3

Radius: 10.6

Gravity: 3.81 G

Time & Orbit

Eccentricity (e): 0.098

Orbit Range: 1.74 AU - 2.12 AU

Year: 1705 Days

Day: 5.8 Hours

Environment

Temp: -197 °C

Axial Tilt: 4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (68)

Outer Limit: 62,777,820 km

• M1: 132,993 km (0.102 R)
• M2: 217,067 km (0.098 R)
• M3: 297,101 km (0.087 R)
• M4: 408,701 km (0.082 R)
• M5: 479,760 km (0.092 R)
• M6: 593,006 km (0.101 R)
• M7: 716,275 km (0.108 R)
• M8: 848,968 km (0.107 R)
• M9: 914,941 km (0.093 R)
• M10: 1,005,896 km (0.101 R)
• M11: 1,132,157 km (0.096 R)
• M12: 1,230,442 km (0.079 R)
• M13: 1,401,134 km (0.061 R)
• M14: 1,471,594 km (0.094 R)
• M15: 1,579,754 km (0.061 R)
• M16: 1,653,356 km (0.078 R)
• M17: 1,728,155 km (0.106 R)
• M18: 1,930,112 km (0.12 R)
• M19: 2,019,122 km (0.088 R)
• M20: 2,150,170 km (0.052 R)
• M21: 2,252,944 km (0.059 R)
• M22: 2,378,606 km (0.076 R)
• M23: 2,517,283 km (0.066 R)
• M24: 2,604,050 km (0.103 R)
• M25: 2,791,795 km (0.063 R)
• M26: 3,192,269 km (0.079 R)
• M27: 3,345,906 km (0.106 R)
• M28: 3,526,022 km (0.08 R)
• M29: 3,660,211 km (0.08 R)
• M30: 3,734,112 km (0.051 R)
• M31: 3,833,595 km (0.063 R)
• M32: 3,908,693 km (0.12 R)
• M33: 4,073,101 km (0.081 R)
• M34: 4,201,307 km (0.111 R)
• M35: 4,356,739 km (0.118 R)
• M36: 4,435,278 km (0.114 R)
• M37: 4,540,595 km (0.098 R)
• M38: 4,606,866 km (0.052 R)
• M39: 4,686,901 km (0.116 R)
• M40: 4,889,008 km (0.055 R)
• M41: 4,956,925 km (0.069 R)
• M42: 5,204,360 km (0.093 R)
• M43: 5,287,686 km (0.045 R)
• M44: 5,540,507 km (0.109 R)
• M45: 5,682,774 km (0.099 R)
• M46: 5,869,472 km (0.104 R)
• M47: 5,970,900 km (0.079 R)
• M48: 6,175,400 km (0.106 R)
• M49: 6,397,104 km (0.102 R)
• M50: 6,924,736 km (0.037 R)
• M51: 7,016,589 km (0.092 R)
• M52: 7,607,800 km (0.057 R)
• M53: 7,686,787 km (0.098 R)
• M54: 7,766,074 km (0.081 R)
• M55: 8,021,587 km (0.051 R)
• M56: 8,491,923 km (0.114 R)
• M57: 8,639,576 km (0.076 R)
• M58: 8,921,119 km (0.081 R)
• M59: 9,071,316 km (0.091 R)
• M60: 9,510,086 km (0.104 R)
• M61: 10,042,355 km (0.115 R)
• M62: 10,338,260 km (0.112 R)
• M63: 10,443,427 km (0.072 R)
• M64: 10,531,391 km (0.05 R)
• M65: 11,460,244 km (0.076 R)
• M66: 12,118,624 km (0.059 R)
• M67: 12,359,477 km (0.069 R)
• M68: 12,433,827 km (0.118 R)

Planet 5 - Gas Giant

Semi-Major Axis: 4 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 562.5

Radius: 8.9

Gravity: 7.1 G

Time & Orbit

Eccentricity (e): 0.127

Orbit Range: 3.49 AU - 4.51 AU

Year: 5087 Days

Day: 14.4 Hours

Environment

Temp: -218 °C

Axial Tilt: 24.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (76)

Outer Limit: 62,777,820 km

• M1: 127,308 km (0.065 R)
• M2: 364,720 km (0.079 R)
• M3: 429,196 km (0.115 R)
• M4: 539,899 km (0.082 R)
• M5: 791,971 km (0.095 R)
• M6: 879,935 km (0.119 R)
• M7: 1,052,421 km (0.105 R)
• M8: 1,150,108 km (0.116 R)
• M9: 1,250,937 km (0.115 R)
• M10: 1,324,839 km (0.112 R)
• M11: 1,539,661 km (0.089 R)
• M12: 1,683,874 km (0.119 R)
• M13: 2,090,181 km (0.097 R)
• M14: 2,304,705 km (0.106 R)
• M15: 2,526,409 km (0.094 R)
• M16: 3,151,429 km (0.063 R)
• M17: 3,608,151 km (0.034 R)
• M18: 3,887,899 km (0.094 R)
• M19: 4,041,386 km (0.072 R)
• M20: 4,560,192 km (0.058 R)
• M21: 5,934,398 km (0.057 R)
• M22: 6,367,633 km (0.092 R)
• M23: 6,653,365 km (0.03 R)
• M24: 6,784,712 km (0.101 R)
• M25: 7,700,102 km (0.101 R)
• M26: 7,782,829 km (0.073 R)
• M27: 8,228,481 km (0.104 R)
• M28: 8,711,234 km (0.07 R)
• M29: 8,768,679 km (0.053 R)
• M30: 9,115,746 km (0.111 R)
• M31: 9,555,863 km (0.092 R)
• M32: 9,972,942 km (0.102 R)
• M33: 10,763,417 km (0.106 R)
• M34: 11,228,517 km (0.052 R)
• M35: 11,479,243 km (0.113 R)
• M36: 11,573,789 km (0.068 R)
• M37: 11,700,199 km (0.091 R)
• M38: 11,763,629 km (0.028 R)
• M39: 12,050,258 km (0.051 R)
• M40: 12,114,286 km (0.094 R)
• M41: 12,403,907 km (0.065 R)
• M42: 12,630,548 km (0.091 R)
• M43: 12,695,623 km (0.071 R)
• M44: 12,891,447 km (0.042 R)
• M45: 13,055,406 km (0.055 R)
• M46: 13,285,936 km (0.052 R)
• M47: 13,352,208 km (0.076 R)
• M48: 14,629,774 km (0.07 R)
• M49: 14,835,022 km (0.088 R)
• M50: 15,248,511 km (0.067 R)
• M51: 15,665,889 km (0.096 R)
• M52: 16,334,143 km (0.055 R)
• M53: 17,227,691 km (0.101 R)
• M54: 17,480,810 km (0.072 R)
• M55: 17,880,985 km (0.105 R)
• M56: 18,027,142 km (0.087 R)
• M57: 18,468,306 km (0.084 R)
• M58: 18,764,360 km (0.058 R)
• M59: 19,024,810 km (0.037 R)
• M60: 19,813,041 km (0.073 R)
• M61: 20,268,268 km (0.062 R)
• M62: 20,459,005 km (0.102 R)
• M63: 20,765,381 km (0.105 R)
• M64: 21,849,667 km (0.095 R)
• M65: 22,280,658 km (0.09 R)
• M66: 22,359,347 km (0.115 R)
• M67: 22,556,367 km (0.07 R)
• M68: 23,031,639 km (0.03 R)
• M69: 23,630,480 km (0.108 R)
• M70: 23,710,664 km (0.116 R)
• M71: 24,113,232 km (0.064 R)
• M72: 25,170,291 km (0.055 R)
• M73: 25,704,355 km (0.1 R)
• M74: 26,200,870 km (0.097 R)
• M75: 27,035,178 km (0.102 R)
• M76: 27,245,213 km (0.029 R)

Planet 6 - Gas Giant

Semi-Major Axis: 4.69 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 648.1

Radius: 8.5

Gravity: 8.97 G

Time & Orbit

Eccentricity (e): 0.086

Orbit Range: 4.29 AU - 5.09 AU

Year: 6458 Days

Day: 8.3 Hours

Environment

Temp: -212 °C

Axial Tilt: 46.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (83)

Outer Limit: 62,777,820 km

• M1: 190,288 km (0.105 R)
• M2: 375,640 km (0.098 R)
• M3: 440,267 km (0.108 R)
• M4: 545,583 km (0.12 R)
• M5: 686,505 km (0.056 R)
• M6: 883,974 km (0.101 R)
• M7: 1,115,851 km (0.1 R)
• M8: 1,230,742 km (0.108 R)
• M9: 1,580,950 km (0.11 R)
• M10: 1,673,402 km (0.089 R)
• M11: 1,748,650 km (0.116 R)
• M12: 1,941,780 km (0.102 R)
• M13: 2,244,716 km (0.082 R)
• M14: 2,348,986 km (0.118 R)
• M15: 2,476,294 km (0.028 R)
• M16: 2,584,303 km (0.102 R)
• M17: 3,240,739 km (0.105 R)
• M18: 3,502,984 km (0.113 R)
• M19: 3,624,457 km (0.073 R)
• M20: 3,896,576 km (0.071 R)
• M21: 4,513,368 km (0.11 R)
• M22: 4,619,283 km (0.055 R)
• M23: 4,833,208 km (0.105 R)
• M24: 5,077,950 km (0.119 R)
• M25: 5,271,231 km (0.117 R)
• M26: 5,607,975 km (0.092 R)
• M27: 6,480,430 km (0.081 R)
• M28: 7,301,423 km (0.086 R)
• M29: 7,582,368 km (0.082 R)
• M30: 7,645,199 km (0.12 R)
• M31: 7,803,324 km (0.103 R)
• M32: 8,090,552 km (0.052 R)
• M33: 8,251,669 km (0.097 R)
• M34: 8,316,445 km (0.054 R)
• M35: 8,906,608 km (0.092 R)
• M36: 9,544,344 km (0.081 R)
• M37: 9,885,876 km (0.102 R)
• M38: 10,023,656 km (0.052 R)
• M39: 10,092,770 km (0.113 R)
• M40: 10,475,740 km (0.114 R)
• M41: 10,757,284 km (0.095 R)
• M42: 11,544,318 km (0.107 R)
• M43: 11,871,638 km (0.067 R)
• M44: 13,135,591 km (0.082 R)
• M45: 13,287,133 km (0.107 R)
• M46: 13,783,499 km (0.116 R)
• M47: 15,748,916 km (0.091 R)
• M48: 16,071,449 km (0.084 R)
• M49: 16,314,695 km (0.073 R)
• M50: 16,518,447 km (0.069 R)
• M51: 18,009,938 km (0.098 R)
• M52: 18,431,804 km (0.096 R)
• M53: 18,601,598 km (0.081 R)
• M54: 19,070,886 km (0.058 R)
• M55: 19,457,746 km (0.11 R)
• M56: 19,847,299 km (0.12 R)
• M57: 20,064,814 km (0.082 R)
• M58: 20,458,257 km (0.112 R)
• M59: 20,721,998 km (0.114 R)
• M60: 21,877,941 km (0.118 R)
• M61: 22,826,690 km (0.092 R)
• M62: 23,145,932 km (0.118 R)
• M63: 23,237,486 km (0.113 R)
• M64: 23,650,675 km (0.102 R)
• M65: 24,020,033 km (0.045 R)
• M66: 24,298,285 km (0.112 R)
• M67: 25,752,825 km (0.038 R)
• M68: 27,042,657 km (0.105 R)
• M69: 27,380,449 km (0.09 R)
• M70: 27,477,239 km (0.115 R)
• M71: 27,719,588 km (0.057 R)
• M72: 28,402,203 km (0.034 R)
• M73: 28,794,748 km (0.03 R)
• M74: 29,139,720 km (0.054 R)
• M75: 29,933,337 km (0.09 R)
• M76: 30,082,935 km (0.111 R)
• M77: 30,483,109 km (0.093 R)
• M78: 31,592,527 km (0.078 R)
• M79: 32,510,160 km (0.032 R)
• M80: 33,333,098 km (0.037 R)
• M81: 33,591,603 km (0.057 R)
• M82: 34,684,865 km (0.075 R)
• M83: 34,842,092 km (0.109 R)

Planet 7 - Ice Giant

Semi-Major Axis: 8.2 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 690.4

Radius: 7.2

Gravity: 13.32 G

Time & Orbit

Eccentricity (e): 0.156

Orbit Range: 6.92 AU - 9.48 AU

Year: 14930 Days

Day: 20.9 Hours

Environment

Temp: -231 °C

Axial Tilt: 33.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (94)

Outer Limit: 62,777,820 km

• M1: 228,436 km (0.09 R)
• M2: 308,172 km (0.08 R)
• M3: 367,712 km (0.043 R)
• M4: 553,961 km (0.061 R)
• M5: 668,104 km (0.069 R)
• M6: 748,737 km (0.103 R)
• M7: 1,201,121 km (0.031 R)
• M8: 1,351,467 km (0.079 R)
• M9: 1,896,153 km (0.062 R)
• M10: 3,027,861 km (0.101 R)
• M11: 3,199,001 km (0.113 R)
• M12: 3,373,282 km (0.089 R)
• M13: 3,695,067 km (0.107 R)
• M14: 4,678,823 km (0.066 R)
• M15: 4,837,098 km (0.118 R)
• M16: 4,997,018 km (0.032 R)
• M17: 5,077,801 km (0.115 R)
• M18: 5,529,137 km (0.046 R)
• M19: 5,696,537 km (0.107 R)
• M20: 5,780,911 km (0.057 R)
• M21: 5,908,069 km (0.068 R)
• M22: 6,558,221 km (0.117 R)
• M23: 6,646,633 km (0.098 R)
• M24: 6,869,534 km (0.037 R)
• M25: 7,506,223 km (0.091 R)
• M26: 8,209,333 km (0.098 R)
• M27: 8,400,369 km (0.082 R)
• M28: 9,728,050 km (0.062 R)
• M29: 10,909,574 km (0.057 R)
• M30: 10,961,934 km (0.089 R)
• M31: 11,172,418 km (0.115 R)
• M32: 11,225,226 km (0.055 R)
• M33: 11,597,276 km (0.093 R)
• M34: 12,848,064 km (0.115 R)
• M35: 13,573,763 km (0.06 R)
• M36: 15,181,790 km (0.071 R)
• M37: 15,298,925 km (0.11 R)
• M38: 15,357,568 km (0.088 R)
• M39: 15,593,035 km (0.115 R)
• M40: 16,187,088 km (0.073 R)
• M41: 16,306,766 km (0.111 R)
• M42: 16,848,909 km (0.119 R)
• M43: 17,152,742 km (0.093 R)
• M44: 17,765,794 km (0.082 R)
• M45: 18,075,013 km (0.105 R)
• M46: 18,887,180 km (0.079 R)
• M47: 20,288,762 km (0.101 R)
• M48: 20,547,118 km (0.099 R)
• M49: 20,936,820 km (0.103 R)
• M50: 21,132,494 km (0.119 R)
• M51: 21,921,623 km (0.104 R)
• M52: 22,452,995 km (0.037 R)
• M53: 23,190,512 km (0.12 R)
• M54: 24,620,668 km (0.107 R)
• M55: 25,172,983 km (0.119 R)
• M56: 25,799,050 km (0.118 R)
• M57: 25,938,924 km (0.034 R)
• M58: 26,008,936 km (0.099 R)
• M59: 26,149,259 km (0.085 R)
• M60: 26,995,833 km (0.114 R)
• M61: 28,788,465 km (0.044 R)
• M62: 29,882,474 km (0.071 R)
• M63: 30,989,947 km (0.062 R)
• M64: 31,735,692 km (0.05 R)
• M65: 32,261,230 km (0.082 R)
• M66: 33,016,998 km (0.117 R)
• M67: 34,084,828 km (0.092 R)
• M68: 36,019,727 km (0.101 R)
• M69: 37,672,484 km (0.091 R)
• M70: 38,069,666 km (0.108 R)
• M71: 40,806,709 km (0.11 R)
• M72: 41,378,173 km (0.061 R)
• M73: 44,190,762 km (0.12 R)
• M74: 45,282,527 km (0.103 R)
• M75: 45,535,647 km (0.073 R)
• M76: 45,620,170 km (0.047 R)
• M77: 45,704,693 km (0.101 R)
• M78: 45,958,710 km (0.076 R)
• M79: 46,297,998 km (0.12 R)
• M80: 46,382,969 km (0.058 R)
• M81: 46,723,305 km (0.057 R)
• M82: 49,129,287 km (0.091 R)
• M83: 50,609,558 km (0.093 R)
• M84: 51,487,099 km (0.083 R)
• M85: 52,546,850 km (0.055 R)
• M86: 52,901,697 km (0.085 R)
• M87: 53,435,462 km (0.059 R)
• M88: 53,792,253 km (0.044 R)
• M89: 55,678,532 km (0.108 R)
• M90: 56,857,064 km (0.104 R)
• M91: 57,860,716 km (0.09 R)
• M92: 58,686,197 km (0.114 R)
• M93: 58,778,200 km (0.032 R)
• M94: 61,466,025 km (0.066 R)

Kuiper Belt

Range: 30 - 57 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 368 - 15,039 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit