🌌 Stone's Star System Generator

Planet 1 - Gas Giant

Semi-Major Axis: 0.73 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 265.6

Radius: 8.2

Gravity: 3.95 G

Time & Orbit

Eccentricity (e): 0.112

Orbit Range: 0.65 AU - 0.81 AU

Year: 403 Days

Day: 6 Hours

Environment

Temp: -138 °C

Axial Tilt: 6.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (40)

Outer Limit: 62,182,913 km

• M1: 102,923 km (0.08 R)
• M2: 156,479 km (0.046 R)
• M3: 211,980 km (0.1 R)
• M4: 272,567 km (0.093 R)
• M5: 339,288 km (0.097 R)
• M6: 392,694 km (0.055 R)
• M7: 454,778 km (0.091 R)
• M8: 535,112 km (0.091 R)
• M9: 599,588 km (0.102 R)
• M10: 837,150 km (0.032 R)
• M11: 899,382 km (0.069 R)
• M12: 959,820 km (0.11 R)
• M13: 1,043,744 km (0.118 R)
• M14: 1,115,103 km (0.116 R)
• M15: 1,172,548 km (0.114 R)
• M16: 1,371,812 km (0.05 R)
• M17: 1,433,746 km (0.11 R)
• M18: 1,556,267 km (0.062 R)
• M19: 1,607,878 km (0.118 R)
• M20: 1,691,054 km (0.112 R)
• M21: 1,757,775 km (0.056 R)
• M22: 1,847,982 km (0.05 R)
• M23: 1,953,898 km (0.065 R)
• M24: 2,014,485 km (0.096 R)
• M25: 2,080,607 km (0.116 R)
• M26: 2,152,265 km (0.06 R)
• M27: 2,239,480 km (0.087 R)
• M28: 2,307,996 km (0.108 R)
• M29: 2,387,283 km (0.053 R)
• M30: 2,487,663 km (0.102 R)
• M31: 2,892,475 km (0.116 R)
• M32: 3,042,970 km (0.11 R)
• M33: 3,385,250 km (0.096 R)
• M34: 3,441,649 km (0.04 R)
• M35: 3,509,716 km (0.11 R)
• M36: 3,664,549 km (0.102 R)
• M37: 3,716,759 km (0.109 R)
• M38: 3,769,118 km (0.109 R)
• M39: 3,933,676 km (0.119 R)
• M40: 3,987,082 km (0.08 R)

Planet 2 - Gas Giant

Semi-Major Axis: 1.09 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 277.5

Radius: 11.7

Gravity: 2.03 G

Time & Orbit

Eccentricity (e): 0.107

Orbit Range: 0.97 AU - 1.21 AU

Year: 735 Days

Day: 5.4 Hours

Environment

Temp: -156 °C

Axial Tilt: 27.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (46)

Outer Limit: 62,182,913 km

• M1: 152,440 km (0.077 R)
• M2: 226,042 km (0.051 R)
• M3: 312,360 km (0.109 R)
• M4: 407,654 km (0.103 R)
• M5: 480,957 km (0.077 R)
• M6: 652,696 km (0.106 R)
• M7: 895,942 km (0.075 R)
• M8: 969,693 km (0.107 R)
• M9: 1,184,217 km (0.073 R)
• M10: 1,260,960 km (0.085 R)
• M11: 1,339,499 km (0.042 R)
• M12: 1,552,078 km (0.107 R)
• M13: 1,758,224 km (0.09 R)
• M14: 1,870,871 km (0.089 R)
• M15: 1,961,527 km (0.09 R)
• M16: 2,109,629 km (0.088 R)
• M17: 2,197,892 km (0.115 R)
• M18: 2,313,232 km (0.111 R)
• M19: 2,424,084 km (0.103 R)
• M20: 2,698,746 km (0.105 R)
• M21: 2,774,293 km (0.118 R)
• M22: 2,850,438 km (0.117 R)
• M23: 2,955,456 km (0.116 R)
• M24: 3,126,296 km (0.08 R)
• M25: 3,220,244 km (0.053 R)
• M26: 3,300,578 km (0.066 R)
• M27: 3,440,751 km (0.041 R)
• M28: 3,681,454 km (0.093 R)
• M29: 3,780,787 km (0.097 R)
• M30: 3,927,692 km (0.076 R)
• M31: 4,029,269 km (0.072 R)
• M32: 4,108,107 km (0.098 R)
• M33: 4,339,535 km (0.079 R)
• M34: 4,485,243 km (0.098 R)
• M35: 4,591,607 km (0.109 R)
• M36: 4,715,474 km (0.069 R)
• M37: 4,873,749 km (0.116 R)
• M38: 4,957,973 km (0.117 R)
• M39: 5,127,467 km (0.076 R)
• M40: 5,221,714 km (0.108 R)
• M41: 5,342,290 km (0.115 R)
• M42: 5,420,380 km (0.074 R)
• M43: 5,639,241 km (0.102 R)
• M44: 5,763,108 km (0.112 R)
• M45: 5,869,921 km (0.068 R)
• M46: 5,995,583 km (0.06 R)

Planet 3 - Gas Giant

Semi-Major Axis: 1.11 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 115.7

Radius: 12.3

Gravity: 0.76 G

Time & Orbit

Eccentricity (e): 0.042

Orbit Range: 1.06 AU - 1.16 AU

Year: 755 Days

Day: 7.5 Hours

Environment

Temp: -158 °C

Axial Tilt: 11.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (35)

Outer Limit: 62,182,913 km

• M1: 153,039 km (0.069 R)
• M2: 230,680 km (0.106 R)
• M3: 336,296 km (0.114 R)
• M4: 421,716 km (0.113 R)
• M5: 674,836 km (0.114 R)
• M6: 806,333 km (0.029 R)
• M7: 886,816 km (0.05 R)
• M8: 997,668 km (0.097 R)
• M9: 1,093,261 km (0.067 R)
• M10: 1,238,670 km (0.103 R)
• M11: 1,390,811 km (0.102 R)
• M12: 1,498,971 km (0.095 R)
• M13: 1,662,032 km (0.106 R)
• M14: 1,743,414 km (0.07 R)
• M15: 1,840,951 km (0.098 R)
• M16: 1,920,388 km (0.12 R)
• M17: 2,021,366 km (0.102 R)
• M18: 2,098,260 km (0.106 R)
• M19: 2,228,859 km (0.031 R)
• M20: 2,335,223 km (0.117 R)
• M21: 2,698,895 km (0.037 R)
• M22: 2,789,701 km (0.075 R)
• M23: 2,870,185 km (0.105 R)
• M24: 2,980,588 km (0.054 R)
• M25: 3,116,273 km (0.11 R)
• M26: 3,302,373 km (0.084 R)
• M27: 3,387,644 km (0.091 R)
• M28: 3,485,930 km (0.102 R)
• M29: 3,572,846 km (0.089 R)
• M30: 3,742,490 km (0.066 R)
• M31: 4,057,393 km (0.072 R)
• M32: 4,201,606 km (0.06 R)
• M33: 4,287,625 km (0.061 R)
• M34: 4,441,262 km (0.057 R)
• M35: 4,556,003 km (0.104 R)

Planet 4 - Gas Giant

Semi-Major Axis: 1.28 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 395.3

Radius: 10.5

Gravity: 3.59 G

Time & Orbit

Eccentricity (e): 0.242

Orbit Range: 0.97 AU - 1.59 AU

Year: 935 Days

Day: 13.6 Hours

Environment

Temp: -178 °C

Axial Tilt: 18.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (45)

Outer Limit: 62,182,913 km

• M1: 131,945 km (0.099 R)
• M2: 221,106 km (0.056 R)
• M3: 327,619 km (0.1 R)
• M4: 475,272 km (0.066 R)
• M5: 563,535 km (0.114 R)
• M6: 753,524 km (0.065 R)
• M7: 898,036 km (0.095 R)
• M8: 982,559 km (0.082 R)
• M9: 1,069,924 km (0.109 R)
• M10: 1,135,897 km (0.047 R)
• M11: 1,253,032 km (0.1 R)
• M12: 1,368,073 km (0.119 R)
• M13: 1,685,220 km (0.088 R)
• M14: 1,834,668 km (0.118 R)
• M15: 2,239,031 km (0.105 R)
• M16: 2,364,245 km (0.087 R)
• M17: 2,581,012 km (0.092 R)
• M18: 2,654,764 km (0.1 R)
• M19: 2,729,114 km (0.061 R)
• M20: 2,846,399 km (0.109 R)
• M21: 3,033,994 km (0.1 R)
• M22: 3,173,120 km (0.109 R)
• M23: 3,457,656 km (0.068 R)
• M24: 3,676,667 km (0.113 R)
• M25: 3,769,268 km (0.064 R)
• M26: 3,956,714 km (0.107 R)
• M27: 4,042,134 km (0.082 R)
• M28: 4,253,516 km (0.109 R)
• M29: 4,380,226 km (0.03 R)
• M30: 4,518,005 km (0.085 R)
• M31: 4,767,684 km (0.11 R)
• M32: 4,879,135 km (0.06 R)
• M33: 5,343,636 km (0.099 R)
• M34: 5,597,204 km (0.101 R)
• M35: 5,671,854 km (0.108 R)
• M36: 6,050,486 km (0.061 R)
• M37: 6,160,141 km (0.108 R)
• M38: 6,248,404 km (0.073 R)
• M39: 6,415,056 km (0.1 R)
• M40: 6,935,058 km (0.096 R)
• M41: 7,223,483 km (0.051 R)
• M42: 7,421,850 km (0.105 R)
• M43: 7,562,920 km (0.107 R)
• M44: 7,657,466 km (0.114 R)
• M45: 8,027,721 km (0.07 R)

Planet 5 - Gas Giant

Semi-Major Axis: 2.92 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 627.1

Radius: 8.3

Gravity: 9.1 G

Time & Orbit

Eccentricity (e): 0.082

Orbit Range: 2.68 AU - 3.16 AU

Year: 3222 Days

Day: 13.9 Hours

Environment

Temp: -200 °C

Axial Tilt: 16.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (84)

Outer Limit: 62,182,913 km

• M1: 103,971 km (0.075 R)
• M2: 227,838 km (0.099 R)
• M3: 415,134 km (0.094 R)
• M4: 568,322 km (0.098 R)
• M5: 681,269 km (0.082 R)
• M6: 740,659 km (0.081 R)
• M7: 1,765,704 km (0.098 R)
• M8: 1,877,752 km (0.082 R)
• M9: 1,934,749 km (0.08 R)
• M10: 2,079,710 km (0.119 R)
• M11: 2,168,421 km (0.118 R)
• M12: 2,258,329 km (0.079 R)
• M13: 2,630,828 km (0.087 R)
• M14: 3,006,020 km (0.117 R)
• M15: 3,089,794 km (0.087 R)
• M16: 3,191,371 km (0.047 R)
• M17: 3,397,966 km (0.041 R)
• M18: 3,538,289 km (0.116 R)
• M19: 3,644,653 km (0.091 R)
• M20: 3,716,161 km (0.096 R)
• M21: 3,806,219 km (0.028 R)
• M22: 3,878,923 km (0.113 R)
• M23: 4,248,879 km (0.046 R)
• M24: 4,400,122 km (0.102 R)
• M25: 4,707,845 km (0.067 R)
• M26: 4,884,071 km (0.083 R)
• M27: 4,943,312 km (0.038 R)
• M28: 5,263,302 km (0.027 R)
• M29: 5,364,580 km (0.072 R)
• M30: 5,425,765 km (0.098 R)
• M31: 5,776,572 km (0.066 R)
• M32: 5,839,254 km (0.118 R)
• M33: 5,902,234 km (0.07 R)
• M34: 6,134,859 km (0.065 R)
• M35: 6,263,064 km (0.097 R)
• M36: 6,413,710 km (0.073 R)
• M37: 6,609,234 km (0.081 R)
• M38: 7,028,407 km (0.094 R)
• M39: 7,117,717 km (0.043 R)
• M40: 7,185,036 km (0.109 R)
• M41: 7,707,881 km (0.081 R)
• M42: 7,800,033 km (0.071 R)
• M43: 8,055,397 km (0.077 R)
• M44: 8,479,207 km (0.109 R)
• M45: 9,397,738 km (0.097 R)
• M46: 9,471,640 km (0.062 R)
• M47: 9,719,224 km (0.107 R)
• M48: 10,069,582 km (0.093 R)
• M49: 10,195,693 km (0.065 R)
• M50: 11,406,389 km (0.103 R)
• M51: 11,617,023 km (0.088 R)
• M52: 12,364,414 km (0.085 R)
• M53: 12,526,578 km (0.093 R)
• M54: 12,662,263 km (0.112 R)
• M55: 12,880,227 km (0.095 R)
• M56: 13,403,221 km (0.119 R)
• M57: 13,961,221 km (0.067 R)
• M58: 14,186,665 km (0.108 R)
• M59: 14,271,338 km (0.096 R)
• M60: 14,328,035 km (0.082 R)
• M61: 14,697,991 km (0.086 R)
• M62: 14,755,137 km (0.069 R)
• M63: 14,812,433 km (0.11 R)
• M64: 15,244,322 km (0.102 R)
• M65: 15,331,239 km (0.032 R)
• M66: 15,505,520 km (0.113 R)
• M67: 15,826,707 km (0.1 R)
• M68: 16,179,608 km (0.081 R)
• M69: 16,594,593 km (0.104 R)
• M70: 16,773,512 km (0.064 R)
• M71: 16,863,121 km (0.054 R)
• M72: 17,253,721 km (0.117 R)
• M73: 18,320,054 km (0.066 R)
• M74: 18,597,708 km (0.055 R)
• M75: 18,970,057 km (0.105 R)
• M76: 19,407,631 km (0.104 R)
• M77: 20,006,770 km (0.09 R)
• M78: 20,070,200 km (0.068 R)
• M79: 20,516,002 km (0.087 R)
• M80: 20,580,029 km (0.076 R)
• M81: 20,836,440 km (0.115 R)
• M82: 21,482,404 km (0.081 R)
• M83: 21,612,255 km (0.075 R)
• M84: 21,873,004 km (0.079 R)

Planet 6 - Gas Giant

Semi-Major Axis: 5.41 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 885.7

Radius: 11.5

Gravity: 6.7 G

Time & Orbit

Eccentricity (e): 0.15

Orbit Range: 4.6 AU - 6.22 AU

Year: 8125 Days

Day: 10.9 Hours

Environment

Temp: -217 °C

Axial Tilt: 87.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (86)

Outer Limit: 62,182,913 km

• M1: 301,141 km (0.092 R)
• M2: 452,683 km (0.037 R)
• M3: 619,634 km (0.048 R)
• M4: 1,018,612 km (0.038 R)
• M5: 1,226,852 km (0.07 R)
• M6: 1,554,920 km (0.067 R)
• M7: 2,003,714 km (0.036 R)
• M8: 2,542,715 km (0.046 R)
• M9: 2,723,728 km (0.049 R)
• M10: 3,236,251 km (0.083 R)
• M11: 3,320,026 km (0.119 R)
• M12: 3,604,411 km (0.049 R)
• M13: 4,015,955 km (0.117 R)
• M14: 4,258,004 km (0.063 R)
• M15: 5,372,508 km (0.074 R)
• M16: 5,538,861 km (0.075 R)
• M17: 5,707,009 km (0.118 R)
• M18: 5,876,803 km (0.062 R)
• M19: 6,013,834 km (0.1 R)
• M20: 6,326,195 km (0.048 R)
• M21: 6,822,560 km (0.073 R)
• M22: 7,002,826 km (0.092 R)
• M23: 7,221,388 km (0.116 R)
• M24: 7,479,295 km (0.12 R)
• M25: 7,740,194 km (0.108 R)
• M26: 8,735,319 km (0.054 R)
• M27: 8,813,559 km (0.105 R)
• M28: 9,811,077 km (0.12 R)
• M29: 10,426,822 km (0.049 R)
• M30: 10,886,237 km (0.097 R)
• M31: 11,738,646 km (0.1 R)
• M32: 12,304,275 km (0.096 R)
• M33: 12,568,316 km (0.056 R)
• M34: 12,834,301 km (0.103 R)
• M35: 14,099,749 km (0.103 R)
• M36: 14,376,206 km (0.056 R)
• M37: 14,561,408 km (0.103 R)
• M38: 14,747,508 km (0.074 R)
• M39: 15,452,114 km (0.118 R)
• M40: 15,928,134 km (0.109 R)
• M41: 16,119,769 km (0.091 R)
• M42: 16,457,112 km (0.052 R)
• M43: 16,748,230 km (0.101 R)
• M44: 17,335,401 km (0.118 R)
• M45: 17,582,088 km (0.056 R)
• M46: 17,979,121 km (0.051 R)
• M47: 18,228,800 km (0.104 R)
• M48: 18,329,030 km (0.048 R)
• M49: 18,832,726 km (0.093 R)
• M50: 19,035,581 km (0.118 R)
• M51: 19,188,021 km (0.095 R)
• M52: 19,341,060 km (0.031 R)
• M53: 19,750,958 km (0.08 R)
• M54: 21,737,019 km (0.107 R)
• M55: 22,056,411 km (0.094 R)
• M56: 22,915,701 km (0.082 R)
• M57: 23,458,293 km (0.036 R)
• M58: 24,335,235 km (0.091 R)
• M59: 24,556,191 km (0.032 R)
• M60: 24,888,897 km (0.045 R)
• M61: 25,390,648 km (0.104 R)
• M62: 25,895,840 km (0.096 R)
• M63: 26,631,263 km (0.104 R)
• M64: 28,820,329 km (0.101 R)
• M65: 28,937,165 km (0.064 R)
• M66: 29,171,286 km (0.079 R)
• M67: 29,406,005 km (0.097 R)
• M68: 29,818,296 km (0.083 R)
• M69: 30,767,944 km (0.102 R)
• M70: 31,126,530 km (0.047 R)
• M71: 31,246,358 km (0.093 R)
• M72: 31,546,750 km (0.111 R)
• M73: 32,150,228 km (0.098 R)
• M74: 34,664,370 km (0.107 R)
• M75: 34,850,769 km (0.087 R)
• M76: 35,599,805 km (0.116 R)
• M77: 36,670,028 km (0.118 R)
• M78: 37,623,266 km (0.101 R)
• M79: 38,391,601 km (0.11 R)
• M80: 38,906,666 km (0.107 R)
• M81: 39,100,545 km (0.093 R)
• M82: 40,008,903 km (0.108 R)
• M83: 40,531,150 km (0.105 R)
• M84: 44,519,578 km (0.11 R)
• M85: 44,789,902 km (0.052 R)
• M86: 44,992,906 km (0.057 R)

Planet 7 - Ice Giant

Semi-Major Axis: 7.92 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 722.1

Radius: 7.4

Gravity: 13.19 G

Time & Orbit

Eccentricity (e): 0.108

Orbit Range: 7.06 AU - 8.78 AU

Year: 14391 Days

Day: 21.6 Hours

Environment

Temp: -236 °C

Axial Tilt: 128.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (89)

Outer Limit: 62,182,913 km

• M1: 113,994 km (0.065 R)
• M2: 254,616 km (0.091 R)
• M3: 337,493 km (0.077 R)
• M4: 645,664 km (0.047 R)
• M5: 786,286 km (0.108 R)
• M6: 959,371 km (0.099 R)
• M7: 1,027,438 km (0.111 R)
• M8: 1,217,427 km (0.111 R)
• M9: 1,444,667 km (0.086 R)
• M10: 1,657,993 km (0.114 R)
• M11: 1,740,571 km (0.079 R)
• M12: 2,450,563 km (0.074 R)
• M13: 2,545,109 km (0.089 R)
• M14: 3,379,416 km (0.079 R)
• M15: 5,112,956 km (0.054 R)
• M16: 5,315,811 km (0.03 R)
• M17: 5,855,111 km (0.116 R)
• M18: 6,940,892 km (0.087 R)
• M19: 7,621,712 km (0.11 R)
• M20: 8,134,534 km (0.106 R)
• M21: 8,706,596 km (0.036 R)
• M22: 9,838,902 km (0.111 R)
• M23: 12,131,191 km (0.047 R)
• M24: 13,336,351 km (0.075 R)
• M25: 13,953,143 km (0.119 R)
• M26: 14,009,691 km (0.034 R)
• M27: 15,098,464 km (0.084 R)
• M28: 16,811,809 km (0.081 R)
• M29: 18,772,887 km (0.111 R)
• M30: 19,400,450 km (0.055 R)
• M31: 20,676,071 km (0.11 R)
• M32: 20,740,548 km (0.025 R)
• M33: 21,323,980 km (0.087 R)
• M34: 21,716,076 km (0.055 R)
• M35: 22,044,443 km (0.105 R)
• M36: 23,643,794 km (0.112 R)
• M37: 24,253,256 km (0.083 R)
• M38: 24,457,457 km (0.103 R)
• M39: 24,662,406 km (0.079 R)
• M40: 26,042,446 km (0.081 R)
• M41: 26,112,159 km (0.077 R)
• M42: 26,882,588 km (0.102 R)
• M43: 27,447,619 km (0.065 R)
• M44: 28,949,282 km (0.114 R)
• M45: 29,021,389 km (0.076 R)
• M46: 30,038,205 km (0.116 R)
• M47: 30,404,122 km (0.109 R)
• M48: 33,233,167 km (0.085 R)
• M49: 34,220,064 km (0.035 R)
• M50: 35,139,642 km (0.073 R)
• M51: 36,067,448 km (0.032 R)
• M52: 36,690,374 km (0.12 R)
• M53: 37,552,656 km (0.107 R)
• M54: 37,946,846 km (0.069 R)
• M55: 38,659,830 km (0.106 R)
• M56: 39,297,266 km (0.049 R)
• M57: 40,260,078 km (0.105 R)
• M58: 41,068,206 km (0.068 R)
• M59: 41,311,751 km (0.113 R)
• M60: 41,637,127 km (0.104 R)
• M61: 42,618,489 km (0.064 R)
• M62: 43,773,085 km (0.107 R)
• M63: 45,356,279 km (0.094 R)
• M64: 46,112,796 km (0.087 R)
• M65: 46,197,019 km (0.039 R)
• M66: 46,281,392 km (0.09 R)
• M67: 47,212,789 km (0.094 R)
• M68: 48,235,889 km (0.119 R)
• M69: 48,578,617 km (0.072 R)
• M70: 48,664,337 km (0.058 R)
• M71: 49,180,150 km (0.107 R)
• M72: 50,043,929 km (0.114 R)
• M73: 51,261,506 km (0.087 R)
• M74: 52,137,252 km (0.036 R)
• M75: 52,665,033 km (0.054 R)
• M76: 53,106,197 km (0.047 R)
• M77: 54,615,340 km (0.082 R)
• M78: 54,972,430 km (0.091 R)
• M79: 55,330,418 km (0.092 R)
• M80: 58,312,502 km (0.043 R)
• M81: 59,318,248 km (0.116 R)
• M82: 59,409,952 km (0.117 R)
• M83: 59,777,215 km (0.086 R)
• M84: 60,421,682 km (0.086 R)
• M85: 60,513,984 km (0.112 R)
• M86: 60,976,092 km (0.094 R)
• M87: 61,068,693 km (0.118 R)
• M88: 61,532,147 km (0.058 R)
• M89: 61,996,798 km (0.069 R)

Kuiper Belt

Range: 30 - 48 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 320 - 19,577 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit