🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.63 AU

Composition

Type: Main (Rocky/Icy Mix)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 1.26 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 542.4

Radius: 9.2

Gravity: 6.41 G

Time & Orbit

Eccentricity (e): 0.059

Orbit Range: 1.19 AU - 1.33 AU

Year: 913 Days

Day: 6.7 Hours

Environment

Temp: -161 °C

Axial Tilt: 44 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (49)

Outer Limit: 36,284,756 km

• M1: 115,938 km (0.088 R)
• M2: 474,225 km (0.107 R)
• M3: 579,542 km (0.082 R)
• M4: 688,001 km (0.062 R)
• M5: 769,980 km (0.079 R)
• M6: 849,716 km (0.105 R)
• M7: 1,011,880 km (0.076 R)
• M8: 1,145,321 km (0.092 R)
• M9: 1,210,845 km (0.104 R)
• M10: 1,298,210 km (0.119 R)
• M11: 1,500,915 km (0.103 R)
• M12: 1,573,321 km (0.087 R)
• M13: 1,631,963 km (0.079 R)
• M14: 1,782,159 km (0.102 R)
• M15: 1,929,214 km (0.061 R)
• M16: 2,032,137 km (0.103 R)
• M17: 2,104,543 km (0.094 R)
• M18: 2,436,650 km (0.12 R)
• M19: 2,531,046 km (0.114 R)
• M20: 2,812,440 km (0.082 R)
• M21: 2,875,271 km (0.06 R)
• M22: 2,947,826 km (0.076 R)
• M23: 3,076,181 km (0.108 R)
• M24: 3,376,574 km (0.1 R)
• M25: 3,530,360 km (0.115 R)
• M26: 3,735,758 km (0.087 R)
• M27: 3,815,045 km (0.095 R)
• M28: 3,914,976 km (0.085 R)
• M29: 4,015,805 km (0.093 R)
• M30: 4,117,532 km (0.059 R)
• M31: 4,230,329 km (0.106 R)
• M32: 4,532,815 km (0.111 R)
• M33: 4,788,478 km (0.103 R)
• M34: 4,961,713 km (0.09 R)
• M35: 5,181,023 km (0.094 R)
• M36: 5,269,585 km (0.112 R)
• M37: 5,549,782 km (0.116 R)
• M38: 5,651,957 km (0.081 R)
• M39: 5,743,212 km (0.036 R)
• M40: 5,950,405 km (0.034 R)
• M41: 6,313,030 km (0.097 R)
• M42: 6,395,907 km (0.101 R)
• M43: 6,610,730 km (0.102 R)
• M44: 7,108,891 km (0.115 R)
• M45: 7,219,892 km (0.09 R)
• M46: 7,368,742 km (0.114 R)
• M47: 7,568,904 km (0.107 R)
• M48: 7,745,430 km (0.112 R)
• M49: 8,622,372 km (0.117 R)

Planet 2 - Gas Giant

Semi-Major Axis: 1.36 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 477

Radius: 8.2

Gravity: 7.09 G

Time & Orbit

Eccentricity (e): 0.097

Orbit Range: 1.23 AU - 1.49 AU

Year: 1024 Days

Day: 8.1 Hours

Environment

Temp: -173 °C

Axial Tilt: 28.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (65)

Outer Limit: 36,284,756 km

• M1: 117,285 km (0.085 R)
• M2: 233,821 km (0.107 R)
• M3: 310,116 km (0.113 R)
• M4: 414,984 km (0.117 R)
• M5: 543,040 km (0.092 R)
• M6: 599,289 km (0.055 R)
• M7: 663,167 km (0.06 R)
• M8: 729,738 km (0.101 R)
• M9: 786,885 km (0.098 R)
• M10: 851,661 km (0.102 R)
• M11: 943,215 km (0.108 R)
• M12: 1,012,478 km (0.044 R)
• M13: 1,077,105 km (0.091 R)
• M14: 1,176,587 km (0.101 R)
• M15: 1,265,448 km (0.111 R)
• M16: 1,370,915 km (0.046 R)
• M17: 1,450,052 km (0.115 R)
• M18: 1,501,364 km (0.086 R)
• M19: 1,620,893 km (0.113 R)
• M20: 2,022,713 km (0.119 R)
• M21: 2,155,257 km (0.114 R)
• M22: 2,359,308 km (0.093 R)
• M23: 2,411,368 km (0.108 R)
• M24: 2,463,727 km (0.108 R)
• M25: 2,578,618 km (0.117 R)
• M26: 2,768,159 km (0.088 R)
• M27: 2,859,862 km (0.073 R)
• M28: 3,112,982 km (0.103 R)
• M29: 3,179,703 km (0.107 R)
• M30: 3,305,066 km (0.035 R)
• M31: 3,373,282 km (0.088 R)
• M32: 3,822,974 km (0.093 R)
• M33: 4,028,820 km (0.103 R)
• M34: 4,091,352 km (0.067 R)
• M35: 4,238,407 km (0.098 R)
• M36: 4,333,850 km (0.112 R)
• M37: 4,516,210 km (0.11 R)
• M38: 4,602,977 km (0.09 R)
• M39: 4,745,095 km (0.109 R)
• M40: 4,910,849 km (0.078 R)
• M41: 5,168,606 km (0.085 R)
• M42: 5,431,001 km (0.114 R)
• M43: 5,511,634 km (0.078 R)
• M44: 5,909,415 km (0.055 R)
• M45: 6,016,228 km (0.115 R)
• M46: 6,099,853 km (0.052 R)
• M47: 6,183,778 km (0.109 R)
• M48: 6,511,247 km (0.059 R)
• M49: 6,670,868 km (0.118 R)
• M50: 6,757,336 km (0.049 R)
• M51: 6,944,034 km (0.069 R)
• M52: 7,069,397 km (0.082 R)
• M53: 7,144,944 km (0.109 R)
• M54: 7,335,083 km (0.097 R)
• M55: 7,398,961 km (0.12 R)
• M56: 7,514,151 km (0.077 R)
• M57: 7,824,417 km (0.079 R)
• M58: 8,165,351 km (0.041 R)
• M59: 8,257,952 km (0.104 R)
• M60: 8,337,538 km (0.059 R)
• M61: 8,484,294 km (0.078 R)
• M62: 8,685,652 km (0.112 R)
• M63: 8,997,564 km (0.119 R)
• M64: 9,120,683 km (0.12 R)
• M65: 9,258,163 km (0.095 R)

Planet 3 - Gas Giant

Semi-Major Axis: 1.39 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 111.5

Radius: 11.5

Gravity: 0.84 G

Time & Orbit

Eccentricity (e): 0.228

Orbit Range: 1.07 AU - 1.71 AU

Year: 1058 Days

Day: 12 Hours

Environment

Temp: -183 °C

Axial Tilt: 27.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (42)

Outer Limit: 36,284,756 km

• M1: 144,512 km (0.09 R)
• M2: 237,711 km (0.098 R)
• M3: 354,248 km (0.081 R)
• M4: 445,502 km (0.119 R)
• M5: 518,955 km (0.071 R)
• M6: 638,633 km (0.087 R)
• M7: 716,424 km (0.099 R)
• M8: 818,749 km (0.098 R)
• M9: 971,189 km (0.113 R)
• M10: 1,086,230 km (0.068 R)
• M11: 1,211,144 km (0.046 R)
• M12: 1,290,431 km (0.081 R)
• M13: 1,366,577 km (0.109 R)
• M14: 1,544,897 km (0.078 R)
• M15: 1,686,716 km (0.058 R)
• M16: 1,827,188 km (0.091 R)
• M17: 1,965,866 km (0.086 R)
• M18: 2,054,428 km (0.085 R)
• M19: 2,168,571 km (0.109 R)
• M20: 2,297,225 km (0.096 R)
• M21: 2,397,007 km (0.086 R)
• M22: 2,472,853 km (0.111 R)
• M23: 2,679,148 km (0.094 R)
• M24: 2,817,526 km (0.107 R)
• M25: 2,931,520 km (0.068 R)
• M26: 3,067,504 km (0.09 R)
• M27: 3,157,113 km (0.101 R)
• M28: 3,409,784 km (0.118 R)
• M29: 3,531,407 km (0.1 R)
• M30: 3,683,698 km (0.095 R)
• M31: 3,897,623 km (0.111 R)
• M32: 4,002,341 km (0.071 R)
• M33: 4,100,478 km (0.034 R)
• M34: 4,230,179 km (0.033 R)
• M35: 4,493,471 km (0.116 R)
• M36: 4,754,220 km (0.104 R)
• M37: 4,995,522 km (0.119 R)
• M38: 5,191,645 km (0.086 R)
• M39: 5,365,178 km (0.064 R)
• M40: 5,540,806 km (0.12 R)
• M41: 5,633,557 km (0.093 R)
• M42: 5,709,852 km (0.052 R)

Planet 4 - Gas Giant

Semi-Major Axis: 1.57 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 392.7

Radius: 10.8

Gravity: 3.37 G

Time & Orbit

Eccentricity (e): 0.006

Orbit Range: 1.56 AU - 1.58 AU

Year: 1270 Days

Day: 6.1 Hours

Environment

Temp: -180 °C

Axial Tilt: 33.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (56)

Outer Limit: 36,284,756 km

• M1: 144,212 km (0.095 R)
• M2: 216,767 km (0.071 R)
• M3: 354,697 km (0.105 R)
• M4: 434,283 km (0.109 R)
• M5: 506,389 km (0.076 R)
• M6: 604,974 km (0.114 R)
• M7: 705,204 km (0.113 R)
• M8: 775,665 km (0.056 R)
• M9: 873,502 km (0.093 R)
• M10: 943,514 km (0.103 R)
• M11: 1,062,444 km (0.116 R)
• M12: 1,208,003 km (0.038 R)
• M13: 1,450,351 km (0.059 R)
• M14: 1,684,622 km (0.027 R)
• M15: 1,956,740 km (0.081 R)
• M16: 2,102,448 km (0.057 R)
• M17: 2,414,061 km (0.06 R)
• M18: 2,580,114 km (0.064 R)
• M19: 2,683,487 km (0.038 R)
• M20: 2,817,078 km (0.076 R)
• M21: 3,031,750 km (0.064 R)
• M22: 3,101,164 km (0.029 R)
• M23: 3,343,213 km (0.069 R)
• M24: 3,529,014 km (0.12 R)
• M25: 3,749,970 km (0.053 R)
• M26: 3,835,390 km (0.04 R)
• M27: 4,051,709 km (0.115 R)
• M28: 4,383,966 km (0.108 R)
• M29: 4,621,826 km (0.104 R)
• M30: 4,748,087 km (0.09 R)
• M31: 4,945,556 km (0.038 R)
• M32: 5,027,685 km (0.1 R)
• M33: 5,110,263 km (0.043 R)
• M34: 5,229,044 km (0.075 R)
• M35: 5,324,637 km (0.104 R)
• M36: 5,396,743 km (0.088 R)
• M37: 5,542,152 km (0.116 R)
• M38: 5,787,194 km (0.107 R)
• M39: 5,923,477 km (0.056 R)
• M40: 6,287,898 km (0.096 R)
• M41: 6,802,664 km (0.076 R)
• M42: 7,025,714 km (0.104 R)
• M43: 7,171,273 km (0.028 R)
• M44: 7,695,314 km (0.101 R)
• M45: 7,927,640 km (0.079 R)
• M46: 8,148,446 km (0.085 R)
• M47: 8,413,384 km (0.084 R)
• M48: 8,723,650 km (0.075 R)
• M49: 8,865,918 km (0.102 R)
• M50: 8,994,572 km (0.087 R)
• M51: 9,138,336 km (0.07 R)
• M52: 9,370,063 km (0.116 R)
• M53: 9,501,110 km (0.099 R)
• M54: 9,588,924 km (0.111 R)
• M55: 9,957,533 km (0.07 R)
• M56: 10,031,884 km (0.117 R)

Planet 5 - Gas Giant

Semi-Major Axis: 1.81 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 947.4

Radius: 12

Gravity: 6.58 G

Time & Orbit

Eccentricity (e): 0.146

Orbit Range: 1.55 AU - 2.07 AU

Year: 1572 Days

Day: 13.4 Hours

Environment

Temp: -176 °C

Axial Tilt: 39 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (66)

Outer Limit: 36,284,756 km

• M1: 153,188 km (0.062 R)
• M2: 342,579 km (0.105 R)
• M3: 511,026 km (0.071 R)
• M4: 734,526 km (0.09 R)
• M5: 871,408 km (0.103 R)
• M6: 1,044,343 km (0.119 R)
• M7: 1,135,298 km (0.055 R)
• M8: 1,238,820 km (0.109 R)
• M9: 1,496,428 km (0.1 R)
• M10: 1,749,996 km (0.09 R)
• M11: 1,893,311 km (0.096 R)
• M12: 2,468,963 km (0.055 R)
• M13: 2,655,811 km (0.087 R)
• M14: 2,744,672 km (0.04 R)
• M15: 3,030,404 km (0.116 R)
• M16: 3,150,232 km (0.117 R)
• M17: 3,298,783 km (0.09 R)
• M18: 3,546,966 km (0.096 R)
• M19: 3,631,040 km (0.062 R)
• M20: 3,974,367 km (0.098 R)
• M21: 4,238,856 km (0.058 R)
• M22: 4,448,442 km (0.1 R)
• M23: 4,585,175 km (0.033 R)
• M24: 4,661,619 km (0.09 R)
• M25: 4,785,037 km (0.117 R)
• M26: 4,987,743 km (0.108 R)
• M27: 5,098,146 km (0.096 R)
• M28: 5,177,433 km (0.073 R)
• M29: 5,289,332 km (0.08 R)
• M30: 5,794,075 km (0.043 R)
• M31: 6,161,787 km (0.118 R)
• M32: 6,502,720 km (0.119 R)
• M33: 6,640,949 km (0.033 R)
• M34: 6,937,601 km (0.112 R)
• M35: 7,132,078 km (0.099 R)
• M36: 7,292,447 km (0.08 R)
• M37: 7,417,960 km (0.096 R)
• M38: 7,616,776 km (0.075 R)
• M39: 7,927,490 km (0.034 R)
• M40: 8,130,794 km (0.072 R)
• M41: 8,429,690 km (0.095 R)
• M42: 8,599,334 km (0.056 R)
• M43: 8,999,658 km (0.116 R)
• M44: 9,192,490 km (0.115 R)
• M45: 9,543,147 km (0.1 R)
• M46: 9,641,284 km (0.108 R)
• M47: 9,878,247 km (0.036 R)
• M48: 10,297,569 km (0.083 R)
• M49: 10,621,000 km (0.1 R)
• M50: 11,009,506 km (0.11 R)
• M51: 11,360,911 km (0.075 R)
• M52: 11,800,280 km (0.113 R)
• M53: 11,990,419 km (0.115 R)
• M54: 12,202,698 km (0.101 R)
• M55: 12,416,324 km (0.075 R)
• M56: 12,544,978 km (0.111 R)
• M57: 12,825,474 km (0.061 R)
• M58: 12,933,933 km (0.108 R)
• M59: 13,129,906 km (0.094 R)
• M60: 13,217,271 km (0.109 R)
• M61: 13,613,107 km (0.097 R)
• M62: 13,879,092 km (0.057 R)
• M63: 13,990,542 km (0.078 R)
• M64: 14,778,325 km (0.116 R)
• M65: 14,869,280 km (0.085 R)
• M66: 15,326,900 km (0.07 R)

Planet 6 - Gas Giant

Semi-Major Axis: 5.02 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 186.8

Radius: 8.5

Gravity: 2.59 G

Time & Orbit

Eccentricity (e): 0.001

Orbit Range: 5.01 AU - 5.03 AU

Year: 7262 Days

Day: 12.7 Hours

Environment

Temp: -226 °C

Axial Tilt: 17 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (61)

Outer Limit: 36,284,756 km

• M1: 108,010 km (0.072 R)
• M2: 360,531 km (0.086 R)
• M3: 482,453 km (0.07 R)
• M4: 629,657 km (0.115 R)
• M5: 815,009 km (0.1 R)
• M6: 1,005,597 km (0.104 R)
• M7: 1,558,511 km (0.056 R)
• M8: 1,874,013 km (0.095 R)
• M9: 2,063,403 km (0.098 R)
• M10: 2,460,885 km (0.102 R)
• M11: 2,581,461 km (0.036 R)
• M12: 2,703,832 km (0.063 R)
• M13: 2,882,153 km (0.114 R)
• M14: 3,064,363 km (0.095 R)
• M15: 3,250,463 km (0.082 R)
• M16: 3,383,006 km (0.119 R)
• M17: 3,712,122 km (0.1 R)
• M18: 4,297,348 km (0.09 R)
• M19: 5,239,665 km (0.11 R)
• M20: 5,484,856 km (0.083 R)
• M21: 5,711,198 km (0.108 R)
• M22: 6,646,933 km (0.065 R)
• M23: 6,719,039 km (0.09 R)
• M24: 8,762,246 km (0.099 R)
• M25: 8,920,820 km (0.1 R)
• M26: 9,375,149 km (0.118 R)
• M27: 9,727,602 km (0.098 R)
• M28: 10,139,744 km (0.115 R)
• M29: 11,066,502 km (0.119 R)
• M30: 11,237,942 km (0.057 R)
• M31: 11,410,129 km (0.092 R)
• M32: 11,670,279 km (0.078 R)
• M33: 11,844,711 km (0.102 R)
• M34: 12,284,828 km (0.069 R)
• M35: 12,610,801 km (0.093 R)
• M36: 12,819,790 km (0.1 R)
• M37: 13,362,531 km (0.115 R)
• M38: 13,423,267 km (0.056 R)
• M39: 14,408,070 km (0.104 R)
• M40: 14,720,580 km (0.075 R)
• M41: 14,814,677 km (0.101 R)
• M42: 15,671,424 km (0.04 R)
• M43: 15,928,284 km (0.112 R)
• M44: 16,186,639 km (0.069 R)
• M45: 16,446,341 km (0.109 R)
• M46: 17,068,668 km (0.108 R)
• M47: 17,499,061 km (0.064 R)
• M48: 17,598,843 km (0.104 R)
• M49: 17,865,875 km (0.11 R)
• M50: 18,743,117 km (0.11 R)
• M51: 18,947,468 km (0.083 R)
• M52: 19,015,834 km (0.065 R)
• M53: 19,496,342 km (0.098 R)
• M54: 20,294,298 km (0.06 R)
• M55: 21,422,265 km (0.071 R)
• M56: 21,493,474 km (0.112 R)
• M57: 22,209,449 km (0.029 R)
• M58: 22,969,855 km (0.103 R)
• M59: 23,042,710 km (0.081 R)
• M60: 23,261,721 km (0.074 R)
• M61: 23,628,236 km (0.119 R)

Planet 7 - Gas Giant

Semi-Major Axis: 5.2 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 506.9

Radius: 8.1

Gravity: 7.73 G

Time & Orbit

Eccentricity (e): 0.171

Orbit Range: 4.31 AU - 6.09 AU

Year: 7656 Days

Day: 9 Hours

Environment

Temp: -208 °C

Axial Tilt: 28.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (83)

Outer Limit: 36,284,756 km

• M1: 131,646 km (0.067 R)
• M2: 288,724 km (0.072 R)
• M3: 401,072 km (0.055 R)
• M4: 919,429 km (0.114 R)
• M5: 1,160,281 km (0.112 R)
• M6: 1,210,845 km (0.087 R)
• M7: 1,475,185 km (0.068 R)
• M8: 1,548,787 km (0.094 R)
• M9: 1,796,820 km (0.111 R)
• M10: 1,935,497 km (0.067 R)
• M11: 2,098,559 km (0.079 R)
• M12: 2,160,941 km (0.12 R)
• M13: 2,223,922 km (0.058 R)
• M14: 2,330,286 km (0.103 R)
• M15: 2,681,841 km (0.059 R)
• M16: 2,818,125 km (0.051 R)
• M17: 2,910,127 km (0.113 R)
• M18: 3,050,301 km (0.104 R)
• M19: 3,459,301 km (0.114 R)
• M20: 3,733,215 km (0.1 R)
• M21: 3,783,779 km (0.097 R)
• M22: 4,196,519 km (0.063 R)
• M23: 4,515,612 km (0.061 R)
• M24: 4,623,771 km (0.073 R)
• M25: 5,008,986 km (0.083 R)
• M26: 5,461,818 km (0.118 R)
• M27: 6,165,676 km (0.093 R)
• M28: 7,305,911 km (0.104 R)
• M29: 7,560,976 km (0.045 R)
• M30: 7,657,466 km (0.109 R)
• M31: 7,721,943 km (0.111 R)
• M32: 7,819,032 km (0.048 R)
• M33: 7,916,420 km (0.1 R)
• M34: 8,410,093 km (0.115 R)
• M35: 8,913,490 km (0.066 R)
• M36: 9,288,981 km (0.087 R)
• M37: 9,426,760 km (0.063 R)
• M38: 9,530,581 km (0.061 R)
• M39: 10,055,370 km (0.111 R)
• M40: 10,303,553 km (0.085 R)
• M41: 10,446,270 km (0.111 R)
• M42: 10,589,584 km (0.046 R)
• M43: 10,661,541 km (0.092 R)
• M44: 11,574,238 km (0.098 R)
• M45: 11,722,639 km (0.111 R)
• M46: 11,908,888 km (0.107 R)
• M47: 12,021,236 km (0.057 R)
• M48: 12,473,919 km (0.117 R)
• M49: 16,166,443 km (0.108 R)
• M50: 16,665,951 km (0.053 R)
• M51: 17,128,208 km (0.088 R)
• M52: 17,255,067 km (0.084 R)
• M53: 18,022,355 km (0.113 R)
• M54: 19,282,118 km (0.063 R)
• M55: 19,944,687 km (0.105 R)
• M56: 20,167,289 km (0.109 R)
• M57: 20,435,368 km (0.106 R)
• M58: 20,659,765 km (0.097 R)
• M59: 20,884,910 km (0.074 R)
• M60: 23,181,237 km (0.118 R)
• M61: 23,321,410 km (0.096 R)
• M62: 23,555,980 km (0.06 R)
• M63: 23,932,817 km (0.111 R)
• M64: 24,121,909 km (0.098 R)
• M65: 25,315,251 km (0.1 R)
• M66: 25,459,762 km (0.103 R)
• M67: 25,556,253 km (0.099 R)
• M68: 25,798,003 km (0.092 R)
• M69: 27,560,865 km (0.083 R)
• M70: 28,306,759 km (0.095 R)
• M71: 28,958,557 km (0.094 R)
• M72: 30,379,438 km (0.089 R)
• M73: 31,098,256 km (0.096 R)
• M74: 31,459,834 km (0.075 R)
• M75: 31,511,595 km (0.086 R)
• M76: 31,822,758 km (0.083 R)
• M77: 33,288,219 km (0.062 R)
• M78: 33,499,451 km (0.112 R)
• M79: 33,923,112 km (0.083 R)
• M80: 33,976,220 km (0.082 R)
• M81: 34,188,798 km (0.096 R)
• M82: 35,689,414 km (0.114 R)
• M83: 36,176,206 km (0.119 R)

Kuiper Belt

Range: 30 - 49 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 380 - 10,488 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit