🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.53 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.66

Radius: 1.22

Gravity: 1.12 G

Time & Orbit

Eccentricity (e): 0.212

Orbit Range: 0.42 AU - 0.64 AU

Year: 147 Days

Day: 44.7 Hours

Environment

Temp: 194 °C

Axial Tilt: 11.8 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 2 - Terrestrial

Semi-Major Axis: 0.68 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.1

Radius: 1.76

Gravity: 1.32 G

Time & Orbit

Eccentricity (e): 0.21

Orbit Range: 0.54 AU - 0.82 AU

Year: 214 Days

Day: 39.7 Hours

Environment

Temp: 168 °C

Axial Tilt: 21 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 3 - Terrestrial

Semi-Major Axis: 0.71 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.39

Radius: 1.81

Gravity: 1.34 G

Time & Orbit

Eccentricity (e): 0.158

Orbit Range: 0.6 AU - 0.82 AU

Year: 228 Days

Day: 30 Hours

Environment

Temp: 103 °C

Axial Tilt: 3.6 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 4 - Terrestrial

Semi-Major Axis: 3.65 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 2.54

Radius: 1.45

Gravity: 1.21 G

Time & Orbit

Eccentricity (e): 0.13

Orbit Range: 3.18 AU - 4.12 AU

Year: 2655 Days

Day: 16.3 Hours

Environment

Temp: -129 °C

Axial Tilt: 29.9 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Asteroid Belt

Center: 4.12 AU

Composition

Type: Main (Rocky/Icy Mix)

A dense region of planetesimals and debris.

Boundary

Planet 5 - Gas Giant

Semi-Major Axis: 4.58 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 362.8

Radius: 12.1

Gravity: 2.48 G

Time & Orbit

Eccentricity (e): 0.156

Orbit Range: 3.87 AU - 5.29 AU

Year: 3732 Days

Day: 11.7 Hours

Environment

Temp: -137 °C

Axial Tilt: 33 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (73)

Outer Limit: 46,000,247 km

• M1: 164,707 km (0.04 R)
• M2: 270,024 km (0.099 R)
• M3: 400,922 km (0.099 R)
• M4: 743,950 km (0.047 R)
• M5: 829,371 km (0.119 R)
• M6: 1,032,375 km (0.084 R)
• M7: 1,129,314 km (0.102 R)
• M8: 1,403,677 km (0.096 R)
• M9: 1,611,319 km (0.101 R)
• M10: 2,056,971 km (0.11 R)
• M11: 2,251,747 km (0.099 R)
• M12: 2,351,529 km (0.033 R)
• M13: 2,614,821 km (0.102 R)
• M14: 2,735,098 km (0.112 R)
• M15: 3,059,426 km (0.065 R)
• M16: 3,218,449 km (0.119 R)
• M17: 3,347,552 km (0.105 R)
• M18: 3,478,599 km (0.097 R)
• M19: 3,678,163 km (0.082 R)
• M20: 3,779,441 km (0.081 R)
• M21: 4,264,437 km (0.111 R)
• M22: 4,623,173 km (0.102 R)
• M23: 4,751,079 km (0.072 R)
• M24: 5,312,370 km (0.118 R)
• M25: 5,698,482 km (0.113 R)
• M26: 5,796,469 km (0.059 R)
• M27: 5,895,054 km (0.096 R)
• M28: 6,274,583 km (0.116 R)
• M29: 6,765,414 km (0.119 R)
• M30: 6,848,441 km (0.089 R)
• M31: 6,994,598 km (0.085 R)
• M32: 7,120,709 km (0.048 R)
• M33: 7,226,325 km (0.111 R)
• M34: 7,632,633 km (0.102 R)
• M35: 7,719,250 km (0.096 R)
• M36: 7,980,747 km (0.117 R)
• M37: 8,422,959 km (0.111 R)
• M38: 8,534,858 km (0.063 R)
• M39: 8,669,645 km (0.091 R)
• M40: 8,805,331 km (0.112 R)
• M41: 9,262,352 km (0.11 R)
• M42: 9,354,654 km (0.05 R)
• M43: 9,610,317 km (0.053 R)
• M44: 10,558,917 km (0.116 R)
• M45: 10,752,347 km (0.109 R)
• M46: 11,117,964 km (0.114 R)
• M47: 11,413,570 km (0.055 R)
• M48: 11,811,649 km (0.105 R)
• M49: 12,239,649 km (0.065 R)
• M50: 12,468,235 km (0.114 R)
• M51: 12,647,154 km (0.057 R)
• M52: 12,878,282 km (0.091 R)
• M53: 13,033,116 km (0.098 R)
• M54: 13,423,118 km (0.028 R)
• M55: 13,949,104 km (0.102 R)
• M56: 14,294,675 km (0.078 R)
• M57: 14,723,722 km (0.08 R)
• M58: 14,885,736 km (0.098 R)
• M59: 14,966,968 km (0.111 R)
• M60: 15,567,304 km (0.045 R)
• M61: 15,815,038 km (0.114 R)
• M62: 16,119,769 km (0.066 R)
• M63: 16,370,495 km (0.068 R)
• M64: 16,706,941 km (0.053 R)
• M65: 17,300,994 km (0.087 R)
• M66: 17,414,987 km (0.049 R)
• M67: 18,017,418 km (0.111 R)
• M68: 19,036,479 km (0.118 R)
• M69: 19,242,625 km (0.111 R)
• M70: 19,449,518 km (0.09 R)
• M71: 19,686,781 km (0.037 R)
• M72: 19,775,941 km (0.089 R)
• M73: 19,984,630 km (0.095 R)

Planet 6 - Gas Giant

Semi-Major Axis: 6.15 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 430

Radius: 14.7

Gravity: 1.99 G

Time & Orbit

Eccentricity (e): 0.141

Orbit Range: 5.28 AU - 7.02 AU

Year: 5808 Days

Day: 12.8 Hours

Environment

Temp: -157 °C

Axial Tilt: 32.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (60)

Outer Limit: 46,000,247 km

• M1: 187,446 km (0.074 R)
• M2: 427,102 km (0.119 R)
• M3: 559,047 km (0.102 R)
• M4: 777,610 km (0.104 R)
• M5: 1,053,618 km (0.05 R)
• M6: 1,176,288 km (0.061 R)
• M7: 1,362,837 km (0.027 R)
• M8: 1,498,073 km (0.09 R)
• M9: 1,669,811 km (0.055 R)
• M10: 1,931,907 km (0.082 R)
• M11: 2,085,394 km (0.111 R)
• M12: 2,683,786 km (0.096 R)
• M13: 2,914,615 km (0.117 R)
• M14: 3,092,038 km (0.028 R)
• M15: 3,192,269 km (0.108 R)
• M16: 3,457,955 km (0.074 R)
• M17: 3,688,635 km (0.046 R)
• M18: 3,967,934 km (0.036 R)
• M19: 4,276,405 km (0.108 R)
• M20: 4,501,699 km (0.115 R)
• M21: 5,686,813 km (0.071 R)
• M22: 5,935,146 km (0.115 R)
• M23: 6,314,227 km (0.086 R)
• M24: 6,597,416 km (0.058 R)
• M25: 7,445,037 km (0.12 R)
• M26: 7,662,403 km (0.119 R)
• M27: 9,271,029 km (0.092 R)
• M28: 9,475,679 km (0.108 R)
• M29: 10,068,834 km (0.095 R)
• M30: 10,188,812 km (0.093 R)
• M31: 11,042,716 km (0.114 R)
• M32: 11,824,664 km (0.112 R)
• M33: 12,206,289 km (0.056 R)
• M34: 12,462,999 km (0.069 R)
• M35: 13,342,634 km (0.058 R)
• M36: 13,540,851 km (0.095 R)
• M37: 13,740,116 km (0.111 R)
• M38: 14,478,830 km (0.099 R)
• M39: 14,955,748 km (0.103 R)
• M40: 15,265,116 km (0.102 R)
• M41: 16,135,477 km (0.063 R)
• M42: 16,523,534 km (0.089 R)
• M43: 16,629,898 km (0.104 R)
• M44: 17,561,444 km (0.111 R)
• M45: 17,742,457 km (0.103 R)
• M46: 18,436,292 km (0.11 R)
• M47: 19,662,396 km (0.086 R)
• M48: 20,039,233 km (0.091 R)
• M49: 21,299,446 km (0.09 R)
• M50: 21,764,097 km (0.097 R)
• M51: 22,232,188 km (0.105 R)
• M52: 22,782,409 km (0.079 R)
• M53: 22,980,028 km (0.114 R)
• M54: 23,257,682 km (0.076 R)
• M55: 23,616,118 km (0.107 R)
• M56: 23,936,407 km (0.097 R)
• M57: 24,460,000 km (0.101 R)
• M58: 26,758,122 km (0.095 R)
• M59: 26,883,186 km (0.117 R)
• M60: 27,301,462 km (0.077 R)

Planet 7 - Gas Giant

Semi-Major Axis: 6.55 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 960.8

Radius: 13.6

Gravity: 5.19 G

Time & Orbit

Eccentricity (e): 0.064

Orbit Range: 6.13 AU - 6.97 AU

Year: 6383 Days

Day: 6.3 Hours

Environment

Temp: -156 °C

Axial Tilt: 24 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (80)

Outer Limit: 46,000,247 km

• M1: 272,867 km (0.092 R)
• M2: 462,557 km (0.064 R)
• M3: 547,229 km (0.114 R)
• M4: 680,072 km (0.112 R)
• M5: 765,941 km (0.041 R)
• M6: 902,674 km (0.111 R)
• M7: 1,015,470 km (0.103 R)
• M8: 1,497,624 km (0.081 R)
• M9: 1,614,161 km (0.038 R)
• M10: 2,068,789 km (0.118 R)
• M11: 2,470,310 km (0.115 R)
• M12: 2,586,248 km (0.098 R)
• M13: 2,775,788 km (0.073 R)
• M14: 2,896,664 km (0.067 R)
• M15: 3,295,491 km (0.087 R)
• M16: 3,527,518 km (0.071 R)
• M17: 3,658,865 km (0.095 R)
• M18: 3,765,229 km (0.11 R)
• M19: 3,926,645 km (0.044 R)
• M20: 4,943,162 km (0.089 R)
• M21: 5,031,575 km (0.082 R)
• M22: 5,150,056 km (0.088 R)
• M23: 5,603,188 km (0.11 R)
• M24: 6,323,053 km (0.096 R)
• M25: 7,205,232 km (0.111 R)
• M26: 7,372,931 km (0.101 R)
• M27: 7,883,658 km (0.107 R)
• M28: 8,476,515 km (0.055 R)
• M29: 8,975,573 km (0.109 R)
• M30: 9,742,113 km (0.073 R)
• M31: 9,927,763 km (0.074 R)
• M32: 10,039,812 km (0.12 R)
• M33: 10,873,671 km (0.078 R)
• M34: 11,182,441 km (0.083 R)
• M35: 11,337,873 km (0.059 R)
• M36: 11,572,442 km (0.105 R)
• M37: 12,046,518 km (0.047 R)
• M38: 12,245,932 km (0.055 R)
• M39: 13,465,155 km (0.067 R)
• M40: 13,880,289 km (0.103 R)
• M41: 14,131,314 km (0.051 R)
• M42: 14,595,516 km (0.117 R)
• M43: 14,936,300 km (0.063 R)
• M44: 15,064,805 km (0.097 R)
• M45: 16,018,192 km (0.103 R)
• M46: 16,413,878 km (0.047 R)
• M47: 16,946,447 km (0.107 R)
• M48: 17,035,757 km (0.095 R)
• M49: 18,256,924 km (0.097 R)
• M50: 18,532,035 km (0.082 R)
• M51: 18,624,187 km (0.069 R)
• M52: 19,086,594 km (0.1 R)
• M53: 20,212,168 km (0.074 R)
• M54: 20,878,627 km (0.099 R)
• M55: 21,022,390 km (0.076 R)
• M56: 21,940,473 km (0.075 R)
• M57: 22,576,263 km (0.087 R)
• M58: 22,970,603 km (0.083 R)
• M59: 23,069,488 km (0.082 R)
• M60: 23,865,947 km (0.12 R)
• M61: 24,016,293 km (0.037 R)
• M62: 24,317,882 km (0.062 R)
• M63: 26,776,074 km (0.034 R)
• M64: 27,036,674 km (0.079 R)
• M65: 27,141,242 km (0.107 R)
• M66: 27,665,583 km (0.025 R)
• M67: 27,823,558 km (0.038 R)
• M68: 28,937,763 km (0.101 R)
• M69: 29,258,800 km (0.044 R)
• M70: 30,718,128 km (0.115 R)
• M71: 30,881,788 km (0.106 R)
• M72: 31,484,069 km (0.101 R)
• M73: 31,869,433 km (0.065 R)
• M74: 34,440,571 km (0.109 R)
• M75: 34,553,817 km (0.084 R)
• M76: 36,556,484 km (0.03 R)
• M77: 37,193,621 km (0.097 R)
• M78: 37,426,246 km (0.042 R)
• M79: 37,659,319 km (0.064 R)
• M80: 38,009,977 km (0.087 R)

Planet 8 - Ice Giant

Semi-Major Axis: 12.44 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 693.3

Radius: 7.1

Gravity: 13.75 G

Time & Orbit

Eccentricity (e): 0.17

Orbit Range: 10.33 AU - 14.55 AU

Year: 16708 Days

Day: 17.2 Hours

Environment

Temp: -196 °C

Axial Tilt: 119.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (93)

Outer Limit: 46,000,247 km

• M1: 355,744 km (0.117 R)
• M2: 650,152 km (0.119 R)
• M3: 734,376 km (0.058 R)
• M4: 937,530 km (0.112 R)
• M5: 1,648,419 km (0.108 R)
• M6: 2,557,226 km (0.089 R)
• M7: 2,866,445 km (0.106 R)
• M8: 3,296,987 km (0.102 R)
• M9: 3,482,489 km (0.028 R)
• M10: 3,595,435 km (0.087 R)
• M11: 5,170,551 km (0.083 R)
• M12: 5,560,852 km (0.116 R)
• M13: 5,737,378 km (0.07 R)
• M14: 5,870,968 km (0.104 R)
• M15: 7,024,069 km (0.056 R)
• M16: 8,497,009 km (0.094 R)
• M17: 9,215,977 km (0.063 R)
• M18: 10,061,504 km (0.084 R)
• M19: 11,995,804 km (0.044 R)
• M20: 13,327,824 km (0.085 R)
• M21: 13,505,097 km (0.075 R)
• M22: 14,281,810 km (0.056 R)
• M23: 15,567,005 km (0.07 R)
• M24: 15,753,703 km (0.107 R)
• M25: 17,208,841 km (0.067 R)
• M26: 18,115,554 km (0.108 R)
• M27: 18,311,827 km (0.065 R)
• M28: 18,443,173 km (0.077 R)
• M29: 18,574,670 km (0.096 R)
• M30: 18,640,643 km (0.087 R)
• M31: 18,706,615 km (0.092 R)
• M32: 19,840,118 km (0.064 R)
• M33: 20,381,214 km (0.113 R)
• M34: 20,449,281 km (0.069 R)
• M35: 20,517,348 km (0.076 R)
• M36: 21,894,247 km (0.086 R)
• M37: 22,103,385 km (0.087 R)
• M38: 24,015,096 km (0.1 R)
• M39: 25,172,684 km (0.074 R)
• M40: 25,245,688 km (0.078 R)
• M41: 25,318,692 km (0.066 R)
• M42: 27,316,721 km (0.099 R)
• M43: 27,617,113 km (0.108 R)
• M44: 28,905,600 km (0.098 R)
• M45: 29,441,908 km (0.078 R)
• M46: 29,981,358 km (0.1 R)
• M47: 30,136,192 km (0.119 R)
• M48: 30,992,041 km (0.031 R)
• M49: 31,148,521 km (0.081 R)
• M50: 31,305,299 km (0.045 R)
• M51: 31,698,143 km (0.107 R)
• M52: 32,807,262 km (0.113 R)
• M53: 34,090,213 km (0.081 R)
• M54: 34,656,740 km (0.089 R)
• M55: 35,307,940 km (0.103 R)
• M56: 35,881,049 km (0.114 R)
• M57: 37,535,452 km (0.067 R)
• M58: 38,961,120 km (0.08 R)
• M59: 39,214,539 km (0.03 R)
• M60: 40,319,020 km (0.111 R)
• M61: 40,832,290 km (0.084 R)
• M62: 41,692,328 km (0.06 R)
• M63: 41,951,581 km (0.109 R)
• M64: 42,819,548 km (0.104 R)
• M65: 43,081,045 km (0.071 R)
• M66: 43,518,170 km (0.091 R)
• M67: 47,607,578 km (0.079 R)
• M68: 47,697,785 km (0.101 R)
• M69: 47,788,142 km (0.113 R)
• M70: 48,512,645 km (0.074 R)
• M71: 48,967,273 km (0.027 R)
• M72: 49,880,867 km (0.062 R)
• M73: 51,354,406 km (0.112 R)
• M74: 52,096,411 km (0.116 R)
• M75: 53,029,004 km (0.119 R)
• M76: 53,685,141 km (0.077 R)
• M77: 53,967,133 km (0.071 R)
• M78: 54,155,476 km (0.113 R)
• M79: 56,050,133 km (0.05 R)
• M80: 56,431,758 km (0.076 R)
• M81: 57,293,441 km (0.096 R)
• M82: 57,389,483 km (0.102 R)
• M83: 59,418,030 km (0.083 R)
• M84: 60,392,212 km (0.113 R)
• M85: 60,979,234 km (0.061 R)
• M86: 61,175,356 km (0.079 R)
• M87: 61,863,357 km (0.039 R)
• M88: 62,060,377 km (0.111 R)
• M89: 63,346,321 km (0.108 R)
• M90: 64,341,446 km (0.057 R)
• M91: 66,851,848 km (0.08 R)
• M92: 67,357,788 km (0.08 R)
• M93: 67,661,920 km (0.096 R)

Planet 9 - Ice Giant

Semi-Major Axis: 12.48 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 214.8

Radius: 6

Gravity: 5.97 G

Time & Orbit

Eccentricity (e): 0.24

Orbit Range: 9.48 AU - 15.48 AU

Year: 16789 Days

Day: 19.7 Hours

Environment

Temp: -195 °C

Axial Tilt: 1.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (93)

Outer Limit: 46,000,247 km

• M1: 78,688 km (0.109 R)
• M2: 127,607 km (0.093 R)
• M3: 289,771 km (0.104 R)
• M4: 557,551 km (0.111 R)
• M5: 650,900 km (0.116 R)
• M6: 1,314,666 km (0.081 R)
• M7: 1,398,142 km (0.108 R)
• M8: 1,548,787 km (0.103 R)
• M9: 1,704,668 km (0.081 R)
• M10: 1,796,072 km (0.081 R)
• M11: 1,889,122 km (0.101 R)
• M12: 1,959,882 km (0.054 R)
• M13: 2,352,576 km (0.087 R)
• M14: 2,662,992 km (0.102 R)
• M15: 3,124,800 km (0.111 R)
• M16: 3,407,989 km (0.111 R)
• M17: 3,848,106 km (0.079 R)
• M18: 4,749,134 km (0.107 R)
• M19: 5,008,836 km (0.095 R)
• M20: 5,542,003 km (0.081 R)
• M21: 5,918,989 km (0.102 R)
• M22: 6,198,289 km (0.089 R)
• M23: 6,952,112 km (0.08 R)
• M24: 7,810,355 km (0.059 R)
• M25: 8,116,732 km (0.105 R)
• M26: 8,193,924 km (0.115 R)
• M27: 8,232,670 km (0.111 R)
• M28: 8,662,315 km (0.091 R)
• M29: 8,701,809 km (0.115 R)
• M30: 9,019,256 km (0.076 R)
• M31: 9,624,828 km (0.107 R)
• M32: 9,870,767 km (0.092 R)
• M33: 10,327,040 km (0.056 R)
• M34: 10,410,815 km (0.09 R)
• M35: 10,536,776 km (0.064 R)
• M36: 11,045,559 km (0.106 R)
• M37: 11,216,998 km (0.101 R)
• M38: 11,736,551 km (0.095 R)
• M39: 12,131,340 km (0.064 R)
• M40: 12,486,037 km (0.116 R)
• M41: 12,798,995 km (0.094 R)
• M42: 13,341,737 km (0.101 R)
• M43: 13,432,991 km (0.067 R)
• M44: 13,478,619 km (0.075 R)
• M45: 15,634,623 km (0.106 R)
• M46: 15,778,985 km (0.102 R)
• M47: 16,117,375 km (0.036 R)
• M48: 16,263,084 km (0.092 R)
• M49: 18,400,089 km (0.081 R)
• M50: 19,475,399 km (0.066 R)
• M51: 19,838,323 km (0.079 R)
• M52: 19,942,443 km (0.09 R)
• M53: 20,518,246 km (0.088 R)
• M54: 20,887,603 km (0.064 R)
• M55: 20,993,518 km (0.101 R)
• M56: 21,579,194 km (0.115 R)
• M57: 22,712,248 km (0.057 R)
• M58: 22,875,758 km (0.092 R)
• M59: 23,864,600 km (0.064 R)
• M60: 24,308,607 km (0.071 R)
• M61: 26,569,031 km (0.095 R)
• M62: 26,798,813 km (0.081 R)
• M63: 27,260,173 km (0.066 R)
• M64: 27,375,962 km (0.101 R)
• M65: 27,549,944 km (0.098 R)
• M66: 27,666,032 km (0.026 R)
• M67: 28,015,642 km (0.118 R)
• M68: 29,191,182 km (0.051 R)
• M69: 29,250,423 km (0.098 R)
• M70: 29,784,936 km (0.115 R)
• M71: 30,924,124 km (0.05 R)
• M72: 31,955,452 km (0.097 R)
• M73: 32,628,792 km (0.12 R)
• M74: 33,430,487 km (0.097 R)
• M75: 33,616,437 km (0.104 R)
• M76: 34,051,617 km (0.092 R)
• M77: 35,368,377 km (0.069 R)
• M78: 35,494,638 km (0.048 R)
• M79: 35,874,317 km (0.037 R)
• M80: 37,406,648 km (0.109 R)
• M81: 37,922,163 km (0.108 R)
• M82: 38,245,593 km (0.116 R)
• M83: 38,310,369 km (0.087 R)
• M84: 38,504,996 km (0.062 R)
• M85: 38,634,847 km (0.06 R)
• M86: 39,090,672 km (0.091 R)
• M87: 39,876,210 km (0.054 R)
• M88: 40,600,862 km (0.098 R)
• M89: 41,729,428 km (0.12 R)
• M90: 42,935,337 km (0.12 R)
• M91: 43,610,322 km (0.112 R)
• M92: 43,813,476 km (0.109 R)
• M93: 44,697,600 km (0.033 R)

Kuiper Belt

Range: 30 - 54 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 161 - 16,902 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit