🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.62 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.72

Radius: 1.69

Gravity: 1.3 G

Time & Orbit

Eccentricity (e): 0.112

Orbit Range: 0.55 AU - 0.69 AU

Year: 184 Days

Day: 17.4 Hours

Environment

Temp: 194 °C

Axial Tilt: 46.5 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 2 - Terrestrial

Semi-Major Axis: 1.23 AU

Status: HZ

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 2.92

Radius: 1.54

Gravity: 1.23 G

Time & Orbit

Eccentricity (e): 0.099

Orbit Range: 1.11 AU - 1.35 AU

Year: 514 Days

Day: 43.2 Hours

Environment

Temp: -3 °C

Axial Tilt: 145.7 °

Atmosphere: N₂, O₂

Biome: Arid/Tundra

Satellites (1)

Outer Limit: 99,623,726 km

• M1: 747,092 km (0.042 R)

Planet 3 - Terrestrial

Semi-Major Axis: 1.92 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.35

Radius: 1.8

Gravity: 1.34 G

Time & Orbit

Eccentricity (e): 0.127

Orbit Range: 1.68 AU - 2.16 AU

Year: 1002 Days

Day: 22.1 Hours

Environment

Temp: -83 °C

Axial Tilt: 22 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (2)

Outer Limit: 99,623,726 km

• M1: 841,787 km (0.12 R)
• M2: 1,005,597 km (0.069 R)

Planet 4 - Terrestrial

Semi-Major Axis: 4.2 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.37

Radius: 1.8

Gravity: 1.35 G

Time & Orbit

Eccentricity (e): 0.248

Orbit Range: 3.16 AU - 5.24 AU

Year: 3243 Days

Day: 15.5 Hours

Environment

Temp: -137 °C

Axial Tilt: 22 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 5 - Gas Giant

Semi-Major Axis: 6.45 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 514.8

Radius: 11.1

Gravity: 4.18 G

Time & Orbit

Eccentricity (e): 0.136

Orbit Range: 5.57 AU - 7.33 AU

Year: 6171 Days

Day: 14.3 Hours

Environment

Temp: -149 °C

Axial Tilt: 23.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (74)

Outer Limit: 99,623,726 km

• M1: 138,976 km (0.071 R)
• M2: 254,915 km (0.092 R)
• M3: 438,322 km (0.079 R)
• M4: 521,797 km (0.095 R)
• M5: 931,247 km (0.117 R)
• M6: 1,561,503 km (0.087 R)
• M7: 1,856,659 km (0.12 R)
• M8: 2,113,220 km (0.048 R)
• M9: 2,226,764 km (0.045 R)
• M10: 2,303,658 km (0.064 R)
• M11: 2,930,024 km (0.119 R)
• M12: 3,057,182 km (0.084 R)
• M13: 3,143,051 km (0.077 R)
• M14: 3,472,316 km (0.103 R)
• M15: 3,789,763 km (0.055 R)
• M16: 3,928,590 km (0.114 R)
• M17: 4,045,725 km (0.06 R)
• M18: 4,331,606 km (0.117 R)
• M19: 4,404,161 km (0.074 R)
• M20: 4,698,271 km (0.069 R)
• M21: 5,049,676 km (0.055 R)
• M22: 5,280,057 km (0.12 R)
• M23: 5,645,375 km (0.031 R)
• M24: 5,804,547 km (0.102 R)
• M25: 6,236,137 km (0.108 R)
• M26: 6,622,399 km (0.113 R)
• M27: 6,988,016 km (0.059 R)
• M28: 7,159,006 km (0.119 R)
• M29: 7,245,025 km (0.073 R)
• M30: 7,621,862 km (0.067 R)
• M31: 8,214,120 km (0.076 R)
• M32: 8,455,122 km (0.115 R)
• M33: 9,037,058 km (0.081 R)
• M34: 9,192,340 km (0.116 R)
• M35: 9,758,718 km (0.082 R)
• M36: 10,207,212 km (0.079 R)
• M37: 10,434,003 km (0.103 R)
• M38: 10,629,677 km (0.073 R)
• M39: 10,793,636 km (0.064 R)
• M40: 10,892,520 km (0.089 R)
• M41: 11,091,037 km (0.065 R)
• M42: 11,257,389 km (0.107 R)
• M43: 11,558,979 km (0.105 R)
• M44: 11,727,725 km (0.109 R)
• M45: 12,273,009 km (0.042 R)
• M46: 13,388,411 km (0.097 R)
• M47: 13,494,626 km (0.046 R)
• M48: 13,601,139 km (0.118 R)
• M49: 13,815,064 km (0.117 R)
• M50: 14,246,205 km (0.07 R)
• M51: 14,681,834 km (0.027 R)
• M52: 15,195,553 km (0.108 R)
• M53: 15,269,305 km (0.027 R)
• M54: 16,278,343 km (0.082 R)
• M55: 16,695,571 km (0.029 R)
• M56: 17,077,943 km (0.109 R)
• M57: 17,308,773 km (0.106 R)
• M58: 17,695,783 km (0.106 R)
• M59: 18,203,219 km (0.069 R)
• M60: 18,993,095 km (0.113 R)
• M61: 20,402,457 km (0.032 R)
• M62: 20,647,349 km (0.102 R)
• M63: 20,729,179 km (0.094 R)
• M64: 21,057,845 km (0.1 R)
• M65: 21,346,719 km (0.077 R)
• M66: 22,642,087 km (0.047 R)
• M67: 23,192,756 km (0.111 R)
• M68: 23,320,513 km (0.072 R)
• M69: 24,871,394 km (0.061 R)
• M70: 26,366,625 km (0.061 R)
• M71: 26,588,927 km (0.106 R)
• M72: 27,484,570 km (0.09 R)
• M73: 29,075,543 km (0.066 R)
• M74: 30,742,961 km (0.092 R)

Planet 6 - Gas Giant

Semi-Major Axis: 8.09 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 340.7

Radius: 13.2

Gravity: 1.96 G

Time & Orbit

Eccentricity (e): 0.138

Orbit Range: 6.97 AU - 9.21 AU

Year: 8669 Days

Day: 7.5 Hours

Environment

Temp: -166 °C

Axial Tilt: 17.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (78)

Outer Limit: 99,623,726 km

• M1: 165,306 km (0.062 R)
• M2: 503,247 km (0.118 R)
• M3: 814,261 km (0.06 R)
• M4: 912,697 km (0.055 R)
• M5: 1,138,739 km (0.091 R)
• M6: 1,610,421 km (0.117 R)
• M7: 1,812,079 km (0.114 R)
• M8: 2,061,459 km (0.095 R)
• M9: 2,261,172 km (0.05 R)
• M10: 2,446,374 km (0.092 R)
• M11: 2,788,355 km (0.07 R)
• M12: 2,920,599 km (0.062 R)
• M13: 3,032,498 km (0.076 R)
• M14: 3,237,747 km (0.106 R)
• M15: 3,377,022 km (0.118 R)
• M16: 3,494,756 km (0.096 R)
• M17: 3,637,771 km (0.097 R)
• M18: 3,782,881 km (0.112 R)
• M19: 3,880,569 km (0.097 R)
• M20: 4,408,051 km (0.069 R)
• M21: 4,798,950 km (0.082 R)
• M22: 5,530,633 km (0.082 R)
• M23: 5,838,805 km (0.084 R)
• M24: 6,095,216 km (0.041 R)
• M25: 6,268,300 km (0.086 R)
• M26: 6,413,710 km (0.079 R)
• M27: 6,560,315 km (0.042 R)
• M28: 7,898,020 km (0.12 R)
• M29: 8,630,152 km (0.087 R)
• M30: 9,651,307 km (0.073 R)
• M31: 10,090,975 km (0.086 R)
• M32: 10,193,449 km (0.063 R)
• M33: 10,330,481 km (0.11 R)
• M34: 11,342,660 km (0.075 R)
• M35: 12,642,815 km (0.083 R)
• M36: 12,901,021 km (0.098 R)
• M37: 13,273,071 km (0.116 R)
• M38: 13,460,517 km (0.088 R)
• M39: 14,295,273 km (0.038 R)
• M40: 14,912,963 km (0.103 R)
• M41: 15,303,563 km (0.07 R)
• M42: 15,500,135 km (0.1 R)
• M43: 15,657,960 km (0.119 R)
• M44: 15,975,108 km (0.064 R)
• M45: 16,254,557 km (0.063 R)
• M46: 17,143,018 km (0.043 R)
• M47: 17,923,171 km (0.106 R)
• M48: 18,505,406 km (0.099 R)
• M49: 18,589,031 km (0.111 R)
• M50: 19,093,924 km (0.038 R)
• M51: 19,305,605 km (0.107 R)
• M52: 19,475,399 km (0.059 R)
• M53: 19,560,520 km (0.108 R)
• M54: 19,645,791 km (0.09 R)
• M55: 19,945,286 km (0.106 R)
• M56: 20,591,848 km (0.081 R)
• M57: 20,895,980 km (0.083 R)
• M58: 22,083,039 km (0.092 R)
• M59: 23,654,116 km (0.111 R)
• M60: 24,155,419 km (0.059 R)
• M61: 25,029,369 km (0.059 R)
• M62: 25,261,096 km (0.11 R)
• M63: 26,336,256 km (0.05 R)
• M64: 26,477,626 km (0.059 R)
• M65: 27,331,082 km (0.053 R)
• M66: 27,426,376 km (0.077 R)
• M67: 27,761,026 km (0.062 R)
• M68: 27,952,961 km (0.099 R)
• M69: 28,870,295 km (0.108 R)
• M70: 29,406,005 km (0.082 R)
• M71: 31,281,663 km (0.1 R)
• M72: 31,531,342 km (0.046 R)
• M73: 32,133,174 km (0.112 R)
• M74: 32,233,853 km (0.116 R)
• M75: 32,637,767 km (0.063 R)
• M76: 32,890,887 km (0.059 R)
• M77: 34,115,495 km (0.068 R)
• M78: 34,527,039 km (0.101 R)

Planet 7 - Ice Giant

Semi-Major Axis: 15.63 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 170.3

Radius: 7.5

Gravity: 3.03 G

Time & Orbit

Eccentricity (e): 0.057

Orbit Range: 14.74 AU - 16.52 AU

Year: 23279 Days

Day: 18.3 Hours

Environment

Temp: -199 °C

Axial Tilt: 32.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (65)

Outer Limit: 99,623,726 km

• M1: 106,663 km (0.102 R)
• M2: 171,589 km (0.118 R)
• M3: 265,686 km (0.101 R)
• M4: 484,697 km (0.087 R)
• M5: 719,865 km (0.067 R)
• M6: 774,917 km (0.115 R)
• M7: 929,003 km (0.117 R)
• M8: 989,291 km (0.09 R)
• M9: 1,357,002 km (0.113 R)
• M10: 1,665,174 km (0.102 R)
• M11: 2,773,096 km (0.086 R)
• M12: 3,041,474 km (0.095 R)
• M13: 3,928,889 km (0.064 R)
• M14: 4,469,984 km (0.07 R)
• M15: 5,398,389 km (0.08 R)
• M16: 5,509,390 km (0.097 R)
• M17: 5,998,725 km (0.107 R)
• M18: 6,898,257 km (0.067 R)
• M19: 6,978,441 km (0.088 R)
• M20: 8,389,000 km (0.056 R)
• M21: 9,347,324 km (0.089 R)
• M22: 9,659,535 km (0.1 R)
• M23: 9,749,443 km (0.051 R)
• M24: 10,385,982 km (0.077 R)
• M25: 10,570,286 km (0.052 R)
• M26: 11,129,782 km (0.071 R)
• M27: 11,365,848 km (0.038 R)
• M28: 11,413,121 km (0.063 R)
• M29: 12,229,028 km (0.058 R)
• M30: 13,412,496 km (0.087 R)
• M31: 14,221,671 km (0.114 R)
• M32: 15,833,887 km (0.036 R)
• M33: 16,796,251 km (0.092 R)
• M34: 17,612,756 km (0.117 R)
• M35: 21,122,023 km (0.095 R)
• M36: 21,531,472 km (0.103 R)
• M37: 22,656,149 km (0.077 R)
• M38: 23,195,449 km (0.057 R)
• M39: 27,532,291 km (0.081 R)
• M40: 27,851,384 km (0.102 R)
• M41: 28,622,411 km (0.065 R)
• M42: 29,530,769 km (0.106 R)
• M43: 30,054,212 km (0.114 R)
• M44: 31,043,653 km (0.08 R)
• M45: 31,709,213 km (0.12 R)
• M46: 34,349,616 km (0.116 R)
• M47: 34,968,951 km (0.083 R)
• M48: 36,009,255 km (0.086 R)
• M49: 37,553,404 km (0.076 R)
• M50: 37,624,164 km (0.068 R)
• M51: 37,907,352 km (0.055 R)
• M52: 39,047,438 km (0.113 R)
• M53: 39,334,217 km (0.031 R)
• M54: 39,621,744 km (0.089 R)
• M55: 40,271,148 km (0.066 R)
• M56: 40,851,289 km (0.116 R)
• M57: 42,755,819 km (0.103 R)
• M58: 43,273,578 km (0.106 R)
• M59: 43,644,730 km (0.07 R)
• M60: 44,539,475 km (0.057 R)
• M61: 46,120,126 km (0.087 R)
• M62: 47,260,361 km (0.1 R)
• M63: 47,489,395 km (0.114 R)
• M64: 48,255,935 km (0.041 R)
• M65: 52,702,432 km (0.11 R)

Planet 8 - Ice Giant

Semi-Major Axis: 16.46 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 156.2

Radius: 7.9

Gravity: 2.5 G

Time & Orbit

Eccentricity (e): 0.116

Orbit Range: 14.55 AU - 18.37 AU

Year: 25158 Days

Day: 22.1 Hours

Environment

Temp: -199 °C

Axial Tilt: 34 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (84)

Outer Limit: 99,623,726 km

• M1: 251,175 km (0.09 R)
• M2: 379,231 km (0.069 R)
• M3: 498,759 km (0.088 R)
• M4: 1,035,965 km (0.06 R)
• M5: 1,186,610 km (0.081 R)
• M6: 1,344,735 km (0.09 R)
• M7: 1,582,596 km (0.063 R)
• M8: 2,124,888 km (0.096 R)
• M9: 2,374,118 km (0.093 R)
• M10: 2,516,535 km (0.048 R)
• M11: 2,750,506 km (0.101 R)
• M12: 2,870,185 km (0.094 R)
• M13: 2,960,991 km (0.055 R)
• M14: 3,334,088 km (0.114 R)
• M15: 3,461,844 km (0.076 R)
• M16: 4,193,079 km (0.119 R)
• M17: 4,435,577 km (0.12 R)
• M18: 4,505,738 km (0.048 R)
• M19: 4,611,654 km (0.112 R)
• M20: 4,718,466 km (0.084 R)
• M21: 5,753,983 km (0.118 R)
• M22: 6,023,558 km (0.092 R)
• M23: 7,183,989 km (0.117 R)
• M24: 8,498,655 km (0.059 R)
• M25: 8,673,685 km (0.099 R)
• M26: 9,385,621 km (0.072 R)
• M27: 10,488,456 km (0.065 R)
• M28: 10,723,325 km (0.086 R)
• M29: 10,959,989 km (0.117 R)
• M30: 11,583,214 km (0.112 R)
• M31: 11,874,780 km (0.081 R)
• M32: 15,291,146 km (0.026 R)
• M33: 15,610,987 km (0.117 R)
• M34: 15,718,099 km (0.034 R)
• M35: 15,771,804 km (0.09 R)
• M36: 16,747,781 km (0.038 R)
• M37: 18,079,351 km (0.084 R)
• M38: 19,329,690 km (0.113 R)
• M39: 19,559,922 km (0.114 R)
• M40: 20,023,376 km (0.084 R)
• M41: 20,373,285 km (0.036 R)
• M42: 21,197,569 km (0.115 R)
• M43: 21,316,201 km (0.083 R)
• M44: 21,912,797 km (0.055 R)
• M45: 22,213,040 km (0.068 R)
• M46: 23,000,373 km (0.089 R)
• M47: 23,366,739 km (0.071 R)
• M48: 24,105,453 km (0.067 R)
• M49: 25,921,870 km (0.078 R)
• M50: 25,985,300 km (0.038 R)
• M51: 28,302,720 km (0.058 R)
• M52: 29,486,040 km (0.108 R)
• M53: 30,083,833 km (0.093 R)
• M54: 30,150,404 km (0.099 R)
• M55: 30,484,456 km (0.089 R)
• M56: 31,156,150 km (0.116 R)
• M57: 31,223,619 km (0.037 R)
• M58: 32,582,715 km (0.089 R)
• M59: 33,614,642 km (0.079 R)
• M60: 33,891,697 km (0.044 R)
• M61: 34,517,614 km (0.069 R)
• M62: 35,428,665 km (0.057 R)
• M63: 35,851,728 km (0.029 R)
• M64: 36,489,613 km (0.105 R)
• M65: 36,845,507 km (0.098 R)
• M66: 39,078,105 km (0.064 R)
• M67: 39,223,664 km (0.054 R)
• M68: 39,734,391 km (0.063 R)
• M69: 41,502,488 km (0.095 R)
• M70: 41,576,689 km (0.087 R)
• M71: 42,470,835 km (0.084 R)
• M72: 42,845,129 km (0.099 R)
• M73: 43,521,910 km (0.071 R)
• M74: 43,597,307 km (0.096 R)
• M75: 43,748,252 km (0.049 R)
• M76: 45,267,268 km (0.091 R)
• M77: 47,733,539 km (0.052 R)
• M78: 48,513,243 km (0.112 R)
• M79: 48,904,591 km (0.088 R)
• M80: 49,533,052 km (0.103 R)
• M81: 51,274,820 km (0.113 R)
• M82: 52,634,515 km (0.11 R)
• M83: 53,359,167 km (0.066 R)
• M84: 54,087,110 km (0.094 R)

Planet 9 - Ice Giant

Semi-Major Axis: 19.4 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 593.5

Radius: 4.5

Gravity: 29.31 G

Time & Orbit

Eccentricity (e): 0.151

Orbit Range: 16.47 AU - 22.33 AU

Year: 32191 Days

Day: 22.1 Hours

Environment

Temp: -206 °C

Axial Tilt: 35.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (96)

Outer Limit: 99,623,726 km

• M1: 220,956 km (0.085 R)
• M2: 276,606 km (0.11 R)
• M3: 522,396 km (0.105 R)
• M4: 625,917 km (0.111 R)
• M5: 882,627 km (0.093 R)
• M6: 1,070,522 km (0.1 R)
• M7: 4,351,054 km (0.105 R)
• M8: 4,509,179 km (0.118 R)
• M9: 4,669,099 km (0.111 R)
• M10: 5,271,679 km (0.043 R)
• M11: 6,014,732 km (0.099 R)
• M12: 6,608,336 km (0.118 R)
• M13: 6,850,984 km (0.07 R)
• M14: 7,407,638 km (0.1 R)
• M15: 7,659,710 km (0.092 R)
• M16: 7,850,597 km (0.115 R)
• M17: 9,365,275 km (0.105 R)
• M18: 11,254,248 km (0.068 R)
• M19: 12,278,544 km (0.069 R)
• M20: 12,427,394 km (0.103 R)
• M21: 12,501,894 km (0.084 R)
• M22: 13,485,201 km (0.104 R)
• M23: 13,792,774 km (0.096 R)
• M24: 14,102,591 km (0.112 R)
• M25: 14,180,382 km (0.077 R)
• M26: 14,258,323 km (0.105 R)
• M27: 15,525,117 km (0.064 R)
• M28: 15,928,284 km (0.114 R)
• M29: 16,090,448 km (0.09 R)
• M30: 17,075,400 km (0.097 R)
• M31: 17,910,904 km (0.104 R)
• M32: 20,408,291 km (0.089 R)
• M33: 20,496,255 km (0.09 R)
• M34: 20,761,192 km (0.12 R)
• M35: 21,472,979 km (0.1 R)
• M36: 22,192,844 km (0.05 R)
• M37: 22,646,874 km (0.119 R)
• M38: 22,920,638 km (0.099 R)
• M39: 24,306,213 km (0.099 R)
• M40: 26,482,713 km (0.102 R)
• M41: 29,712,531 km (0.12 R)
• M42: 30,112,406 km (0.114 R)
• M43: 31,627,683 km (0.116 R)
• M44: 33,167,643 km (0.117 R)
• M45: 34,417,085 km (0.061 R)
• M46: 35,364,189 km (0.11 R)
• M47: 38,039,597 km (0.09 R)
• M48: 39,237,427 km (0.065 R)
• M49: 39,785,853 km (0.083 R)
• M50: 42,678,627 km (0.057 R)
• M51: 43,016,868 km (0.119 R)
• M52: 45,408,489 km (0.044 R)
• M53: 46,910,452 km (0.054 R)
• M54: 50,795,807 km (0.039 R)
• M55: 53,200,444 km (0.049 R)
• M56: 53,685,739 km (0.095 R)
• M57: 53,928,985 km (0.1 R)
• M58: 55,395,942 km (0.07 R)
• M59: 57,247,964 km (0.111 R)
• M60: 57,620,911 km (0.101 R)
• M61: 57,869,842 km (0.111 R)
• M62: 59,371,505 km (0.091 R)
• M63: 59,874,902 km (0.035 R)
• M64: 60,632,615 km (0.1 R)
• M65: 61,393,470 km (0.068 R)
• M66: 62,030,009 km (0.036 R)
• M67: 62,796,698 km (0.097 R)
• M68: 63,052,959 km (0.098 R)
• M69: 63,309,520 km (0.103 R)
• M70: 64,081,445 km (0.051 R)
• M71: 64,856,511 km (0.102 R)
• M72: 64,985,913 km (0.063 R)
• M73: 67,200,112 km (0.115 R)
• M74: 69,836,475 km (0.075 R)
• M75: 70,367,846 km (0.037 R)
• M76: 70,900,415 km (0.111 R)
• M77: 71,568,220 km (0.116 R)
• M78: 72,640,836 km (0.061 R)
• M79: 73,853,926 km (0.107 R)
• M80: 74,666,392 km (0.114 R)
• M81: 76,163,567 km (0.113 R)
• M82: 78,358,916 km (0.08 R)
• M83: 79,049,160 km (0.109 R)
• M84: 81,970,358 km (0.074 R)
• M85: 83,373,885 km (0.097 R)
• M86: 84,785,192 km (0.105 R)
• M87: 85,210,199 km (0.12 R)
• M88: 85,635,805 km (0.08 R)
• M89: 87,917,771 km (0.106 R)
• M90: 90,075,421 km (0.09 R)
• M91: 91,233,159 km (0.118 R)
• M92: 95,029,953 km (0.103 R)
• M93: 97,391,804 km (0.101 R)
• M94: 98,133,959 km (0.118 R)
• M95: 98,431,360 km (0.096 R)
• M96: 99,325,207 km (0.069 R)

Kuiper Belt

Range: 30 - 55 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 348 - 18,861 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit