🌌 Stone's Star System Generator

Planet 1 - Gas Giant

Semi-Major Axis: 0.54 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 199.5

Radius: 12.7

Gravity: 1.24 G

Time & Orbit

Eccentricity (e): 0.24

Orbit Range: 0.41 AU - 0.67 AU

Year: 265 Days

Day: 13.2 Hours

Environment

Temp: -140 °C

Axial Tilt: 17.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (26)

Outer Limit: 28,820,010 km

• M1: 159,471 km (0.091 R)
• M2: 263,143 km (0.106 R)
• M3: 387,309 km (0.11 R)
• M4: 469,139 km (0.111 R)
• M5: 565,330 km (0.117 R)
• M6: 662,868 km (0.107 R)
• M7: 799,152 km (0.087 R)
• M8: 885,470 km (0.045 R)
• M9: 991,684 km (0.093 R)
• M10: 1,088,325 km (0.042 R)
• M11: 1,188,555 km (0.076 R)
• M12: 1,313,170 km (0.056 R)
• M13: 1,398,890 km (0.092 R)
• M14: 1,483,412 km (0.108 R)
• M15: 1,566,589 km (0.111 R)
• M16: 1,684,472 km (0.094 R)
• M17: 1,788,592 km (0.085 R)
• M18: 1,919,191 km (0.08 R)
• M19: 2,003,265 km (0.103 R)
• M20: 2,096,016 km (0.085 R)
• M21: 2,179,192 km (0.095 R)
• M22: 2,285,855 km (0.117 R)
• M23: 2,367,985 km (0.065 R)
• M24: 2,512,047 km (0.106 R)
• M25: 2,597,019 km (0.082 R)
• M26: 2,773,545 km (0.101 R)

Planet 2 - Gas Giant

Semi-Major Axis: 0.57 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 97.7

Radius: 10.4

Gravity: 0.9 G

Time & Orbit

Eccentricity (e): 0.209

Orbit Range: 0.45 AU - 0.69 AU

Year: 287 Days

Day: 10.2 Hours

Environment

Temp: -141 °C

Axial Tilt: 35.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (22)

Outer Limit: 28,820,010 km

• M1: 129,851 km (0.069 R)
• M2: 228,586 km (0.086 R)
• M3: 324,777 km (0.071 R)
• M4: 401,670 km (0.032 R)
• M5: 515,963 km (0.041 R)
• M6: 596,447 km (0.072 R)
• M7: 675,883 km (0.089 R)
• M8: 748,289 km (0.029 R)
• M9: 825,930 km (0.109 R)
• M10: 913,594 km (0.067 R)
• M11: 997,369 km (0.099 R)
• M12: 1,071,420 km (0.026 R)
• M13: 1,191,248 km (0.117 R)
• M14: 1,289,085 km (0.103 R)
• M15: 1,356,703 km (0.059 R)
• M16: 1,431,203 km (0.027 R)
• M17: 1,504,207 km (0.11 R)
• M18: 1,683,874 km (0.084 R)
• M19: 1,767,349 km (0.076 R)
• M20: 1,840,054 km (0.106 R)
• M21: 2,209,112 km (0.112 R)
• M22: 2,327,444 km (0.097 R)

Planet 3 - Gas Giant

Semi-Major Axis: 0.97 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 321.7

Radius: 14.1

Gravity: 1.62 G

Time & Orbit

Eccentricity (e): 0.005

Orbit Range: 0.97 AU - 0.97 AU

Year: 637 Days

Day: 6.1 Hours

Environment

Temp: -170 °C

Axial Tilt: 34.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (40)

Outer Limit: 28,820,010 km

• M1: 176,825 km (0.091 R)
• M2: 273,166 km (0.097 R)
• M3: 388,655 km (0.11 R)
• M4: 480,658 km (0.116 R)
• M5: 568,921 km (0.102 R)
• M6: 687,402 km (0.117 R)
• M7: 778,657 km (0.108 R)
• M8: 975,528 km (0.104 R)
• M9: 1,108,969 km (0.119 R)
• M10: 1,273,676 km (0.109 R)
• M11: 1,405,622 km (0.116 R)
• M12: 1,510,490 km (0.098 R)
• M13: 1,618,051 km (0.108 R)
• M14: 1,711,699 km (0.101 R)
• M15: 1,830,180 km (0.119 R)
• M16: 1,933,852 km (0.104 R)
• M17: 2,045,751 km (0.112 R)
• M18: 2,165,878 km (0.115 R)
• M19: 2,388,180 km (0.111 R)
• M20: 2,489,608 km (0.11 R)
• M21: 2,644,442 km (0.098 R)
• M22: 2,762,624 km (0.112 R)
• M23: 2,997,941 km (0.073 R)
• M24: 3,093,834 km (0.098 R)
• M25: 3,582,271 km (0.116 R)
• M26: 3,846,909 km (0.084 R)
• M27: 3,951,628 km (0.114 R)
• M28: 4,042,134 km (0.082 R)
• M29: 4,179,166 km (0.089 R)
• M30: 4,294,656 km (0.104 R)
• M31: 4,497,361 km (0.101 R)
• M32: 4,639,628 km (0.119 R)
• M33: 4,767,235 km (0.104 R)
• M34: 4,880,032 km (0.066 R)
• M35: 5,149,308 km (0.083 R)
• M36: 5,248,342 km (0.118 R)
• M37: 5,423,521 km (0.104 R)
• M38: 5,566,686 km (0.113 R)
• M39: 5,736,630 km (0.057 R)
• M40: 5,865,433 km (0.094 R)

Planet 4 - Gas Giant

Semi-Major Axis: 1.52 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 982.6

Radius: 10.2

Gravity: 9.44 G

Time & Orbit

Eccentricity (e): 0.076

Orbit Range: 1.4 AU - 1.64 AU

Year: 1250 Days

Day: 11.1 Hours

Environment

Temp: -194 °C

Axial Tilt: 1.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (66)

Outer Limit: 28,820,010 km

• M1: 127,308 km (0.085 R)
• M2: 280,945 km (0.052 R)
• M3: 390,899 km (0.101 R)
• M4: 494,271 km (0.077 R)
• M5: 601,982 km (0.055 R)
• M6: 725,550 km (0.12 R)
• M7: 881,281 km (0.078 R)
• M8: 1,056,759 km (0.108 R)
• M9: 1,244,205 km (0.096 R)
• M10: 1,360,144 km (0.063 R)
• M11: 1,651,710 km (0.072 R)
• M12: 1,880,894 km (0.102 R)
• M13: 2,046,648 km (0.102 R)
• M14: 2,131,321 km (0.076 R)
• M15: 2,228,111 km (0.089 R)
• M16: 2,359,308 km (0.102 R)
• M17: 2,722,232 km (0.101 R)
• M18: 2,803,913 km (0.108 R)
• M19: 3,042,222 km (0.099 R)
• M20: 3,139,311 km (0.057 R)
• M21: 3,349,347 km (0.077 R)
• M22: 3,449,876 km (0.12 R)
• M23: 3,692,375 km (0.119 R)
• M24: 3,757,151 km (0.1 R)
• M25: 4,100,328 km (0.113 R)
• M26: 4,234,966 km (0.105 R)
• M27: 4,371,100 km (0.109 R)
• M28: 4,494,967 km (0.1 R)
• M29: 4,802,540 km (0.083 R)
• M30: 5,467,952 km (0.043 R)
• M31: 5,556,813 km (0.092 R)
• M32: 5,676,192 km (0.109 R)
• M33: 5,811,428 km (0.111 R)
• M34: 6,039,416 km (0.117 R)
• M35: 6,394,561 km (0.099 R)
• M36: 6,503,917 km (0.107 R)
• M37: 6,645,586 km (0.07 R)
• M38: 6,932,066 km (0.115 R)
• M39: 7,255,048 km (0.057 R)
• M40: 7,401,953 km (0.083 R)
• M41: 7,516,994 km (0.071 R)
• M42: 7,599,422 km (0.079 R)
• M43: 7,815,442 km (0.1 R)
• M44: 8,016,651 km (0.096 R)
• M45: 8,202,451 km (0.058 R)
• M46: 8,406,952 km (0.065 R)
• M47: 8,492,671 km (0.098 R)
• M48: 8,561,337 km (0.118 R)
• M49: 8,751,475 km (0.1 R)
• M50: 8,873,099 km (0.104 R)
• M51: 9,206,253 km (0.072 R)
• M52: 10,157,097 km (0.09 R)
• M53: 10,395,107 km (0.115 R)
• M54: 10,616,362 km (0.094 R)
• M55: 10,746,213 km (0.073 R)
• M56: 10,951,312 km (0.106 R)
• M57: 11,289,852 km (0.09 R)
• M58: 11,403,397 km (0.066 R)
• M59: 11,688,979 km (0.115 R)
• M60: 11,957,807 km (0.089 R)
• M61: 12,073,595 km (0.058 R)
• M62: 12,248,026 km (0.041 R)
• M63: 12,717,165 km (0.11 R)
• M64: 12,855,095 km (0.117 R)
• M65: 13,112,702 km (0.107 R)
• M66: 13,331,863 km (0.104 R)

Planet 5 - Gas Giant

Semi-Major Axis: 1.55 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 258

Radius: 11.1

Gravity: 2.09 G

Time & Orbit

Eccentricity (e): 0.173

Orbit Range: 1.28 AU - 1.82 AU

Year: 1287 Days

Day: 13.8 Hours

Environment

Temp: -191 °C

Axial Tilt: 29.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (49)

Outer Limit: 28,820,010 km

• M1: 140,173 km (0.078 R)
• M2: 232,176 km (0.066 R)
• M3: 334,501 km (0.085 R)
• M4: 412,741 km (0.07 R)
• M5: 499,058 km (0.072 R)
• M6: 617,540 km (0.12 R)
• M7: 741,407 km (0.089 R)
• M8: 874,400 km (0.076 R)
• M9: 956,080 km (0.111 R)
• M10: 1,028,186 km (0.115 R)
• M11: 1,133,802 km (0.1 R)
• M12: 1,289,534 km (0.095 R)
• M13: 1,418,038 km (0.112 R)
• M14: 1,622,688 km (0.031 R)
• M15: 2,076,867 km (0.085 R)
• M16: 2,286,005 km (0.103 R)
• M17: 2,493,647 km (0.039 R)
• M18: 2,621,254 km (0.051 R)
• M19: 2,751,105 km (0.116 R)
• M20: 2,954,408 km (0.057 R)
• M21: 3,098,770 km (0.051 R)
• M22: 3,171,924 km (0.034 R)
• M23: 3,254,950 km (0.11 R)
• M24: 3,565,366 km (0.068 R)
• M25: 3,670,982 km (0.113 R)
• M26: 4,073,999 km (0.114 R)
• M27: 4,235,265 km (0.089 R)
• M28: 4,501,699 km (0.093 R)
• M29: 4,616,141 km (0.11 R)
• M30: 4,710,538 km (0.115 R)
• M31: 4,784,290 km (0.069 R)
• M32: 5,008,238 km (0.088 R)
• M33: 5,202,864 km (0.07 R)
• M34: 5,344,982 km (0.1 R)
• M35: 5,543,947 km (0.113 R)
• M36: 5,983,466 km (0.096 R)
• M37: 6,155,653 km (0.063 R)
• M38: 6,492,996 km (0.046 R)
• M39: 6,646,185 km (0.077 R)
• M40: 6,729,211 km (0.089 R)
• M41: 6,800,719 km (0.049 R)
• M42: 7,307,856 km (0.089 R)
• M43: 7,405,843 km (0.101 R)
• M44: 7,714,912 km (0.061 R)
• M45: 7,789,711 km (0.104 R)
• M46: 8,015,604 km (0.09 R)
• M47: 8,116,582 km (0.084 R)
• M48: 8,256,306 km (0.025 R)
• M49: 8,641,521 km (0.107 R)

Planet 6 - Gas Giant

Semi-Major Axis: 4.22 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 522.6

Radius: 11.3

Gravity: 4.09 G

Time & Orbit

Eccentricity (e): 0.066

Orbit Range: 3.94 AU - 4.5 AU

Year: 5781 Days

Day: 10.2 Hours

Environment

Temp: -220 °C

Axial Tilt: 36.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (73)

Outer Limit: 28,820,010 km

• M1: 151,243 km (0.105 R)
• M2: 364,570 km (0.083 R)
• M3: 676,930 km (0.118 R)
• M4: 916,885 km (0.105 R)
• M5: 998,566 km (0.117 R)
• M6: 1,591,422 km (0.102 R)
• M7: 1,725,312 km (0.116 R)
• M8: 1,915,750 km (0.101 R)
• M9: 2,076,718 km (0.116 R)
• M10: 2,149,871 km (0.052 R)
• M11: 2,412,565 km (0.113 R)
• M12: 2,989,863 km (0.105 R)
• M13: 3,369,393 km (0.101 R)
• M14: 4,221,054 km (0.071 R)
• M15: 4,792,069 km (0.074 R)
• M16: 5,236,524 km (0.089 R)
• M17: 5,362,336 km (0.098 R)
• M18: 5,694,293 km (0.063 R)
• M19: 6,404,883 km (0.083 R)
• M20: 6,593,825 km (0.119 R)
• M21: 6,729,810 km (0.072 R)
• M22: 6,894,367 km (0.071 R)
• M23: 7,880,517 km (0.082 R)
• M24: 8,345,916 km (0.05 R)
• M25: 8,434,178 km (0.119 R)
• M26: 8,850,360 km (0.104 R)
• M27: 9,121,431 km (0.113 R)
• M28: 9,517,865 km (0.089 R)
• M29: 9,640,984 km (0.094 R)
• M30: 9,857,602 km (0.104 R)
• M31: 9,982,217 km (0.081 R)
• M32: 10,868,884 km (0.117 R)
• M33: 11,030,001 km (0.08 R)
• M34: 11,224,179 km (0.1 R)
• M35: 11,386,941 km (0.081 R)
• M36: 12,145,702 km (0.089 R)
• M37: 12,581,929 km (0.106 R)
• M38: 12,818,892 km (0.025 R)
• M39: 13,023,093 km (0.101 R)
• M40: 13,781,554 km (0.112 R)
• M41: 14,342,097 km (0.109 R)
• M42: 14,660,591 km (0.101 R)
• M43: 15,304,909 km (0.109 R)
• M44: 15,449,271 km (0.115 R)
• M45: 15,557,879 km (0.091 R)
• M46: 15,812,345 km (0.026 R)
• M47: 15,958,353 km (0.12 R)
• M48: 16,031,506 km (0.101 R)
• M49: 16,509,920 km (0.1 R)
• M50: 16,732,223 km (0.106 R)
• M51: 17,480,661 km (0.099 R)
• M52: 18,393,208 km (0.1 R)
• M53: 18,971,404 km (0.079 R)
• M54: 19,908,933 km (0.12 R)
• M55: 19,987,772 km (0.118 R)
• M56: 20,145,747 km (0.118 R)
• M57: 20,224,884 km (0.082 R)
• M58: 21,101,976 km (0.1 R)
• M59: 21,222,552 km (0.089 R)
• M60: 22,032,326 km (0.081 R)
• M61: 22,154,697 km (0.078 R)
• M62: 22,400,037 km (0.081 R)
• M63: 23,598,615 km (0.104 R)
• M64: 24,058,778 km (0.069 R)
• M65: 24,648,643 km (0.03 R)
• M66: 25,030,267 km (0.097 R)
• M67: 26,620,044 km (0.06 R)
• M68: 26,706,960 km (0.083 R)
• M69: 27,800,819 km (0.072 R)
• M70: 27,888,933 km (0.085 R)
• M71: 28,730,869 km (0.081 R)
• M72: 28,953,770 km (0.079 R)
• M73: 29,986,744 km (0.096 R)

Planet 7 - Gas Giant

Semi-Major Axis: 5.16 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 637.1

Radius: 12.5

Gravity: 4.08 G

Time & Orbit

Eccentricity (e): 0.008

Orbit Range: 5.12 AU - 5.2 AU

Year: 7816 Days

Day: 13.9 Hours

Environment

Temp: -216 °C

Axial Tilt: 11.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (87)

Outer Limit: 28,820,010 km

• M1: 178,620 km (0.039 R)
• M2: 258,954 km (0.059 R)
• M3: 360,980 km (0.073 R)
• M4: 558,449 km (0.056 R)
• M5: 1,033,572 km (0.067 R)
• M6: 1,481,767 km (0.057 R)
• M7: 2,338,963 km (0.1 R)
• M8: 2,568,745 km (0.081 R)
• M9: 2,902,947 km (0.092 R)
• M10: 3,025,767 km (0.071 R)
• M11: 3,150,382 km (0.072 R)
• M12: 3,613,237 km (0.094 R)
• M13: 3,692,524 km (0.049 R)
• M14: 3,852,893 km (0.116 R)
• M15: 3,988,429 km (0.054 R)
• M16: 4,319,938 km (0.111 R)
• M17: 4,631,849 km (0.103 R)
• M18: 4,892,598 km (0.116 R)
• M19: 4,980,562 km (0.043 R)
• M20: 5,187,905 km (0.108 R)
• M21: 5,611,416 km (0.091 R)
• M22: 6,427,473 km (0.095 R)
• M23: 6,621,052 km (0.047 R)
• M24: 7,014,195 km (0.098 R)
• M25: 7,280,480 km (0.112 R)
• M26: 7,516,395 km (0.059 R)
• M27: 7,823,221 km (0.03 R)
• M28: 8,169,091 km (0.094 R)
• M29: 8,379,126 km (0.102 R)
• M30: 8,520,048 km (0.054 R)
• M31: 8,768,679 km (0.031 R)
• M32: 10,310,435 km (0.109 R)
• M33: 10,537,375 km (0.068 R)
• M34: 11,267,412 km (0.083 R)
• M35: 12,292,756 km (0.043 R)
• M36: 12,573,851 km (0.109 R)
• M37: 12,695,025 km (0.101 R)
• M38: 13,471,438 km (0.046 R)
• M39: 13,928,011 km (0.086 R)
• M40: 14,941,686 km (0.059 R)
• M41: 16,374,085 km (0.116 R)
• M42: 16,506,479 km (0.069 R)
• M43: 16,905,756 km (0.051 R)
• M44: 17,173,836 km (0.113 R)
• M45: 17,443,261 km (0.059 R)
• M46: 17,668,855 km (0.088 R)
• M47: 18,443,024 km (0.071 R)
• M48: 18,765,108 km (0.061 R)
• M49: 19,042,612 km (0.084 R)
• M50: 19,135,363 km (0.103 R)
• M51: 19,228,413 km (0.069 R)
• M52: 19,461,486 km (0.085 R)
• M53: 19,601,809 km (0.093 R)
• M54: 19,742,431 km (0.083 R)
• M55: 19,977,449 km (0.056 R)
• M56: 20,213,515 km (0.106 R)
• M57: 21,023,138 km (0.103 R)
• M58: 21,263,243 km (0.114 R)
• M59: 21,794,764 km (0.048 R)
• M60: 21,989,092 km (0.118 R)
• M61: 22,330,624 km (0.117 R)
• M62: 23,316,175 km (0.1 R)
• M63: 23,714,404 km (0.063 R)
• M64: 24,922,407 km (0.028 R)
• M65: 25,892,848 km (0.05 R)
• M66: 26,305,140 km (0.106 R)
• M67: 26,460,423 km (0.078 R)
• M68: 27,240,875 km (0.033 R)
• M69: 27,450,312 km (0.062 R)
• M70: 28,771,410 km (0.028 R)
• M71: 28,931,331 km (0.072 R)
• M72: 30,383,776 km (0.119 R)
• M73: 31,584,898 km (0.096 R)
• M74: 32,025,463 km (0.081 R)
• M75: 32,301,771 km (0.099 R)
• M76: 32,578,975 km (0.075 R)
• M77: 33,024,179 km (0.114 R)
• M78: 33,191,728 km (0.052 R)
• M79: 33,471,327 km (0.091 R)
• M80: 33,751,972 km (0.042 R)
• M81: 34,146,013 km (0.118 R)
• M82: 34,371,756 km (0.026 R)
• M83: 34,711,493 km (0.08 R)
• M84: 35,166,121 km (0.04 R)
• M85: 37,527,224 km (0.084 R)
• M86: 39,228,002 km (0.074 R)
• M87: 39,405,426 km (0.063 R)

Planet 8 - Gas Giant

Semi-Major Axis: 5.56 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 194.8

Radius: 13.8

Gravity: 1.02 G

Time & Orbit

Eccentricity (e): 0.167

Orbit Range: 4.63 AU - 6.49 AU

Year: 8743 Days

Day: 9.8 Hours

Environment

Temp: -216 °C

Axial Tilt: 3.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (50)

Outer Limit: 28,820,010 km

• M1: 235,168 km (0.105 R)
• M2: 427,102 km (0.034 R)
• M3: 1,288,935 km (0.108 R)
• M4: 1,608,476 km (0.101 R)
• M5: 2,039,617 km (0.096 R)
• M6: 2,215,245 km (0.048 R)
• M7: 2,600,609 km (0.105 R)
• M8: 3,067,504 km (0.109 R)
• M9: 3,188,529 km (0.101 R)
• M10: 3,539,934 km (0.065 R)
• M11: 3,688,336 km (0.082 R)
• M12: 4,691,988 km (0.114 R)
• M13: 5,044,739 km (0.115 R)
• M14: 5,751,290 km (0.085 R)
• M15: 6,052,879 km (0.084 R)
• M16: 6,154,606 km (0.109 R)
• M17: 6,645,437 km (0.106 R)
• M18: 7,202,838 km (0.094 R)
• M19: 7,747,674 km (0.108 R)
• M20: 7,913,877 km (0.062 R)
• M21: 8,590,059 km (0.066 R)
• M22: 9,109,613 km (0.103 R)
• M23: 9,197,127 km (0.115 R)
• M24: 9,520,708 km (0.108 R)
• M25: 9,848,028 km (0.073 R)
• M26: 10,118,650 km (0.106 R)
• M27: 10,270,043 km (0.087 R)
• M28: 11,038,378 km (0.061 R)
• M29: 11,194,259 km (0.111 R)
• M30: 12,209,281 km (0.068 R)
• M31: 12,435,323 km (0.112 R)
• M32: 13,486,248 km (0.101 R)
• M33: 14,022,257 km (0.116 R)
• M34: 15,882,956 km (0.07 R)
• M35: 16,236,007 km (0.049 R)
• M36: 16,734,616 km (0.107 R)
• M37: 16,842,177 km (0.09 R)
• M38: 19,453,109 km (0.109 R)
• M39: 19,566,205 km (0.067 R)
• M40: 20,020,833 km (0.108 R)
• M41: 20,211,271 km (0.12 R)
• M42: 20,440,604 km (0.072 R)
• M43: 21,017,603 km (0.086 R)
• M44: 21,561,092 km (0.118 R)
• M45: 23,620,008 km (0.107 R)
• M46: 25,328,415 km (0.052 R)
• M47: 25,782,295 km (0.11 R)
• M48: 27,118,354 km (0.042 R)
• M49: 27,286,951 km (0.096 R)
• M50: 28,476,852 km (0.087 R)

Kuiper Belt

Range: 30 - 60 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 164 - 16,785 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit