🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.53 AU

Composition

Type: Main (Rocky/Icy Mix)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 1.06 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 458.4

Radius: 8.7

Gravity: 6.06 G

Time & Orbit

Eccentricity (e): 0.004

Orbit Range: 1.06 AU - 1.06 AU

Year: 728 Days

Day: 12 Hours

Environment

Temp: -171 °C

Axial Tilt: 12 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (54)

Outer Limit: 39,624,276 km

• M1: 108,458 km (0.041 R)
• M2: 172,337 km (0.116 R)
• M3: 262,095 km (0.068 R)
• M4: 329,115 km (0.104 R)
• M5: 392,694 km (0.087 R)
• M6: 449,542 km (0.108 R)
• M7: 599,588 km (0.067 R)
• M8: 713,881 km (0.096 R)
• M9: 786,286 km (0.119 R)
• M10: 907,610 km (0.103 R)
• M11: 1,057,208 km (0.097 R)
• M12: 1,157,888 km (0.087 R)
• M13: 1,535,622 km (0.06 R)
• M14: 1,618,200 km (0.119 R)
• M15: 1,735,186 km (0.1 R)
• M16: 1,977,684 km (0.116 R)
• M17: 2,245,464 km (0.102 R)
• M18: 2,376,512 km (0.117 R)
• M19: 2,457,893 km (0.106 R)
• M20: 2,592,980 km (0.084 R)
• M21: 2,699,793 km (0.12 R)
• M22: 2,965,329 km (0.094 R)
• M23: 3,052,993 km (0.066 R)
• M24: 3,190,324 km (0.075 R)
• M25: 3,255,698 km (0.111 R)
• M26: 3,313,294 km (0.119 R)
• M27: 3,496,401 km (0.117 R)
• M28: 3,589,152 km (0.106 R)
• M29: 3,760,142 km (0.059 R)
• M30: 3,889,993 km (0.084 R)
• M31: 3,960,005 km (0.109 R)
• M32: 4,021,490 km (0.107 R)
• M33: 4,083,423 km (0.117 R)
• M34: 4,199,063 km (0.113 R)
• M35: 4,279,845 km (0.029 R)
• M36: 4,342,976 km (0.076 R)
• M37: 4,442,907 km (0.113 R)
• M38: 4,552,862 km (0.088 R)
• M39: 4,766,039 km (0.027 R)
• M40: 4,822,138 km (0.067 R)
• M41: 4,906,810 km (0.069 R)
• M42: 5,154,245 km (0.107 R)
• M43: 5,308,480 km (0.083 R)
• M44: 5,405,719 km (0.047 R)
• M45: 5,474,085 km (0.103 R)
• M46: 5,542,751 km (0.12 R)
• M47: 5,870,520 km (0.094 R)
• M48: 5,940,831 km (0.092 R)
• M49: 6,327,541 km (0.079 R)
• M50: 6,440,936 km (0.115 R)
• M51: 6,743,423 km (0.059 R)
• M52: 6,891,076 km (0.055 R)
• M53: 7,050,548 km (0.118 R)
• M54: 7,200,445 km (0.066 R)

Planet 2 - Gas Giant

Semi-Major Axis: 1.88 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 775.3

Radius: 14.8

Gravity: 3.54 G

Time & Orbit

Eccentricity (e): 0.193

Orbit Range: 1.52 AU - 2.24 AU

Year: 1719 Days

Day: 6.8 Hours

Environment

Temp: -190 °C

Axial Tilt: 8.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (62)

Outer Limit: 39,624,276 km

• M1: 199,264 km (0.08 R)
• M2: 310,715 km (0.081 R)
• M3: 575,653 km (0.102 R)
• M4: 810,521 km (0.113 R)
• M5: 1,088,325 km (0.099 R)
• M6: 1,447,808 km (0.103 R)
• M7: 1,548,936 km (0.115 R)
• M8: 1,715,888 km (0.116 R)
• M9: 1,823,448 km (0.057 R)
• M10: 1,978,133 km (0.107 R)
• M11: 2,172,161 km (0.104 R)
• M12: 2,420,643 km (0.051 R)
• M13: 2,591,783 km (0.05 R)
• M14: 2,703,982 km (0.05 R)
• M15: 3,011,256 km (0.096 R)
• M16: 3,129,438 km (0.068 R)
• M17: 3,370,739 km (0.119 R)
• M18: 3,521,384 km (0.068 R)
• M19: 3,744,435 km (0.08 R)
• M20: 4,175,426 km (0.096 R)
• M21: 4,352,251 km (0.089 R)
• M22: 4,577,096 km (0.101 R)
• M23: 4,698,570 km (0.097 R)
• M24: 4,851,908 km (0.077 R)
• M25: 4,991,333 km (0.06 R)
• M26: 5,466,157 km (0.117 R)
• M27: 5,643,879 km (0.098 R)
• M28: 5,856,457 km (0.044 R)
• M29: 5,955,491 km (0.041 R)
• M30: 6,138,449 km (0.103 R)
• M31: 6,442,133 km (0.115 R)
• M32: 6,681,639 km (0.109 R)
• M33: 6,854,574 km (0.069 R)
• M34: 7,064,161 km (0.104 R)
• M35: 7,329,099 km (0.09 R)
• M36: 7,525,521 km (0.103 R)
• M37: 7,651,482 km (0.101 R)
• M38: 8,235,961 km (0.079 R)
• M39: 8,496,261 km (0.088 R)
• M40: 8,740,555 km (0.039 R)
• M41: 8,872,949 km (0.115 R)
• M42: 9,216,725 km (0.115 R)
• M43: 9,545,391 km (0.098 R)
• M44: 10,234,290 km (0.052 R)
• M45: 10,333,922 km (0.12 R)
• M46: 10,594,820 km (0.117 R)
• M47: 10,695,799 km (0.036 R)
• M48: 10,796,927 km (0.093 R)
• M49: 11,225,675 km (0.111 R)
• M50: 11,411,176 km (0.077 R)
• M51: 11,910,683 km (0.116 R)
• M52: 12,121,018 km (0.118 R)
• M53: 12,417,371 km (0.078 R)
• M54: 12,845,221 km (0.082 R)
• M55: 13,605,328 km (0.11 R)
• M56: 13,869,368 km (0.115 R)
• M57: 14,157,344 km (0.096 R)
• M58: 14,313,225 km (0.077 R)
• M59: 14,424,825 km (0.041 R)
• M60: 14,716,691 km (0.08 R)
• M61: 14,919,844 km (0.057 R)
• M62: 15,078,418 km (0.109 R)

Planet 3 - Gas Giant

Semi-Major Axis: 2.72 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 927.5

Radius: 10.7

Gravity: 8.1 G

Time & Orbit

Eccentricity (e): 0.189

Orbit Range: 2.21 AU - 3.23 AU

Year: 2991 Days

Day: 11.2 Hours

Environment

Temp: -204 °C

Axial Tilt: 41.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (76)

Outer Limit: 39,624,276 km

• M1: 141,370 km (0.118 R)
• M2: 261,796 km (0.08 R)
• M3: 676,781 km (0.106 R)
• M4: 1,005,298 km (0.08 R)
• M5: 1,125,724 km (0.086 R)
• M6: 1,200,523 km (0.094 R)
• M7: 1,355,357 km (0.105 R)
• M8: 1,448,855 km (0.033 R)
• M9: 1,685,220 km (0.072 R)
• M10: 1,979,479 km (0.094 R)
• M11: 2,055,624 km (0.087 R)
• M12: 2,370,528 km (0.111 R)
• M13: 2,683,935 km (0.111 R)
• M14: 2,958,298 km (0.043 R)
• M15: 3,152,326 km (0.051 R)
• M16: 3,259,887 km (0.068 R)
• M17: 3,460,498 km (0.089 R)
• M18: 4,125,460 km (0.05 R)
• M19: 4,203,999 km (0.058 R)
• M20: 4,342,677 km (0.066 R)
• M21: 4,563,633 km (0.069 R)
• M22: 4,665,359 km (0.079 R)
• M23: 5,143,025 km (0.101 R)
• M24: 5,291,426 km (0.12 R)
• M25: 5,527,641 km (0.099 R)
• M26: 6,055,123 km (0.115 R)
• M27: 6,461,431 km (0.112 R)
• M28: 6,530,097 km (0.114 R)
• M29: 6,598,912 km (0.075 R)
• M30: 6,993,551 km (0.061 R)
• M31: 7,087,498 km (0.095 R)
• M32: 8,223,096 km (0.042 R)
• M33: 8,322,279 km (0.076 R)
• M34: 8,397,078 km (0.119 R)
• M35: 9,105,125 km (0.115 R)
• M36: 9,388,613 km (0.117 R)
• M37: 9,544,494 km (0.116 R)
• M38: 9,622,733 km (0.031 R)
• M39: 10,149,767 km (0.046 R)
• M40: 10,229,652 km (0.052 R)
• M41: 10,443,727 km (0.099 R)
• M42: 10,821,910 km (0.106 R)
• M43: 11,067,400 km (0.117 R)
• M44: 11,177,205 km (0.084 R)
• M45: 11,259,633 km (0.097 R)
• M46: 11,425,388 km (0.108 R)
• M47: 11,955,263 km (0.034 R)
• M48: 12,096,035 km (0.114 R)
• M49: 12,407,797 km (0.12 R)
• M50: 12,493,217 km (0.101 R)
• M51: 12,722,102 km (0.088 R)
• M52: 12,808,270 km (0.055 R)
• M53: 12,981,206 km (0.04 R)
• M54: 13,329,469 km (0.1 R)
• M55: 13,739,816 km (0.085 R)
• M56: 14,005,652 km (0.093 R)
• M57: 14,362,892 km (0.119 R)
• M58: 14,482,719 km (0.113 R)
• M59: 14,723,123 km (0.084 R)
• M60: 15,883,554 km (0.105 R)
• M61: 16,007,421 km (0.092 R)
• M62: 16,506,031 km (0.104 R)
• M63: 16,631,543 km (0.059 R)
• M64: 16,978,162 km (0.032 R)
• M65: 17,073,156 km (0.047 R)
• M66: 17,710,742 km (0.109 R)
• M67: 18,032,527 km (0.108 R)
• M68: 18,258,869 km (0.104 R)
• M69: 18,714,394 km (0.062 R)
• M70: 18,976,340 km (0.106 R)
• M71: 19,107,837 km (0.059 R)
• M72: 19,371,727 km (0.107 R)
• M73: 19,769,807 km (0.078 R)
• M74: 19,836,378 km (0.111 R)
• M75: 20,304,620 km (0.097 R)
• M76: 22,805,148 km (0.086 R)

Planet 4 - Ice Giant

Semi-Major Axis: 7.73 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 223

Radius: 3.9

Gravity: 14.66 G

Time & Orbit

Eccentricity (e): 0.046

Orbit Range: 7.37 AU - 8.09 AU

Year: 14332 Days

Day: 20.1 Hours

Environment

Temp: -235 °C

Axial Tilt: 17.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (61)

Outer Limit: 39,624,276 km

• M1: 1,049,579 km (0.116 R)
• M2: 1,767,200 km (0.118 R)
• M3: 1,920,986 km (0.049 R)
• M4: 2,171,563 km (0.088 R)
• M5: 2,957,251 km (0.113 R)
• M6: 3,488,473 km (0.113 R)
• M7: 3,570,752 km (0.108 R)
• M8: 3,709,279 km (0.108 R)
• M9: 4,222,250 km (0.114 R)
• M10: 4,516,809 km (0.083 R)
• M11: 5,032,622 km (0.047 R)
• M12: 5,094,555 km (0.067 R)
• M13: 5,219,171 km (0.089 R)
• M14: 5,313,268 km (0.072 R)
• M15: 5,344,683 km (0.065 R)
• M16: 5,471,393 km (0.095 R)
• M17: 5,566,986 km (0.062 R)
• M18: 5,663,177 km (0.109 R)
• M19: 5,759,817 km (0.077 R)
• M20: 5,954,893 km (0.067 R)
• M21: 6,996,842 km (0.116 R)
• M22: 7,065,956 km (0.073 R)
• M23: 7,627,098 km (0.074 R)
• M24: 9,167,208 km (0.102 R)
• M25: 9,356,748 km (0.066 R)
• M26: 9,778,315 km (0.118 R)
• M27: 10,919,298 km (0.097 R)
• M28: 10,959,390 km (0.085 R)
• M29: 11,120,208 km (0.118 R)
• M30: 12,813,357 km (0.086 R)
• M31: 13,281,149 km (0.068 R)
• M32: 13,711,094 km (0.105 R)
• M33: 15,702,241 km (0.086 R)
• M34: 16,569,759 km (0.118 R)
• M35: 16,846,815 km (0.112 R)
• M36: 18,829,286 km (0.081 R)
• M37: 19,750,060 km (0.053 R)
• M38: 20,536,796 km (0.082 R)
• M39: 22,191,348 km (0.079 R)
• M40: 22,293,075 km (0.083 R)
• M41: 23,524,864 km (0.095 R)
• M42: 24,936,918 km (0.073 R)
• M43: 25,946,853 km (0.098 R)
• M44: 26,645,625 km (0.104 R)
• M45: 27,133,015 km (0.059 R)
• M46: 29,000,445 km (0.101 R)
• M47: 29,837,445 km (0.095 R)
• M48: 30,625,826 km (0.053 R)
• M49: 30,909,014 km (0.101 R)
• M50: 31,706,670 km (0.088 R)
• M51: 31,935,705 km (0.102 R)
• M52: 32,050,446 km (0.086 R)
• M53: 32,568,653 km (0.116 R)
• M54: 33,380,222 km (0.101 R)
• M55: 33,846,967 km (0.096 R)
• M56: 35,675,801 km (0.111 R)
• M57: 37,415,475 km (0.052 R)
• M58: 38,447,999 km (0.114 R)
• M59: 39,244,009 km (0.109 R)
• M60: 39,674,851 km (0.077 R)
• M61: 41,538,841 km (0.09 R)

Planet 5 - Ice Giant

Semi-Major Axis: 7.9 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 605.8

Radius: 6.9

Gravity: 12.72 G

Time & Orbit

Eccentricity (e): 0.008

Orbit Range: 7.84 AU - 7.96 AU

Year: 14807 Days

Day: 17.1 Hours

Environment

Temp: -230 °C

Axial Tilt: 16.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (88)

Outer Limit: 39,624,276 km

• M1: 242,199 km (0.038 R)
• M2: 365,468 km (0.116 R)
• M3: 411,544 km (0.057 R)
• M4: 674,686 km (0.106 R)
• M5: 1,029,682 km (0.089 R)
• M6: 1,944,922 km (0.091 R)
• M7: 2,145,682 km (0.102 R)
• M8: 2,883,349 km (0.05 R)
• M9: 3,279,634 km (0.075 R)
• M10: 3,553,249 km (0.119 R)
• M11: 4,343,425 km (0.059 R)
• M12: 5,028,882 km (0.107 R)
• M13: 5,107,122 km (0.103 R)
• M14: 6,119,151 km (0.055 R)
• M15: 6,498,382 km (0.086 R)
• M16: 6,712,307 km (0.108 R)
• M17: 6,798,625 km (0.095 R)
• M18: 7,235,301 km (0.096 R)
• M19: 7,771,460 km (0.075 R)
• M20: 8,505,985 km (0.073 R)
• M21: 9,166,909 km (0.098 R)
• M22: 10,738,434 km (0.073 R)
• M23: 11,042,268 km (0.073 R)
• M24: 11,144,293 km (0.098 R)
• M25: 11,297,781 km (0.114 R)
• M26: 12,817,097 km (0.115 R)
• M27: 13,247,340 km (0.078 R)
• M28: 13,409,953 km (0.082 R)
• M29: 14,122,189 km (0.087 R)
• M30: 14,177,540 km (0.066 R)
• M31: 14,510,844 km (0.079 R)
• M32: 15,015,587 km (0.062 R)
• M33: 15,469,168 km (0.081 R)
• M34: 15,697,604 km (0.095 R)
• M35: 19,256,088 km (0.099 R)
• M36: 19,810,498 km (0.025 R)
• M37: 20,370,293 km (0.1 R)
• M38: 20,746,233 km (0.046 R)
• M39: 21,124,566 km (0.108 R)
• M40: 21,441,564 km (0.112 R)
• M41: 21,696,329 km (0.092 R)
• M42: 22,016,169 km (0.111 R)
• M43: 22,466,608 km (0.088 R)
• M44: 23,704,381 km (0.088 R)
• M45: 24,497,399 km (0.115 R)
• M46: 25,232,074 km (0.097 R)
• M47: 25,433,732 km (0.068 R)
• M48: 27,410,070 km (0.113 R)
• M49: 27,964,031 km (0.089 R)
• M50: 29,153,184 km (0.037 R)
• M51: 30,788,139 km (0.08 R)
• M52: 31,003,560 km (0.053 R)
• M53: 31,219,580 km (0.095 R)
• M54: 31,363,792 km (0.092 R)
• M55: 32,015,740 km (0.093 R)
• M56: 33,111,993 km (0.098 R)
• M57: 33,849,809 km (0.089 R)
• M58: 34,295,013 km (0.115 R)
• M59: 35,191,254 km (0.052 R)
• M60: 35,717,688 km (0.068 R)
• M61: 35,793,086 km (0.06 R)
• M62: 37,235,957 km (0.067 R)
• M63: 38,852,661 km (0.115 R)
• M64: 41,597,782 km (0.095 R)
• M65: 42,473,379 km (0.077 R)
• M66: 44,000,025 km (0.095 R)
• M67: 44,323,755 km (0.056 R)
• M68: 46,446,997 km (0.084 R)
• M69: 47,769,891 km (0.06 R)
• M70: 48,102,597 km (0.057 R)
• M71: 49,356,975 km (0.093 R)
• M72: 50,452,779 km (0.057 R)
• M73: 50,706,946 km (0.082 R)
• M74: 51,301,299 km (0.061 R)
• M75: 51,471,541 km (0.05 R)
• M76: 51,812,475 km (0.072 R)
• M77: 52,668,474 km (0.089 R)
• M78: 55,264,146 km (0.067 R)
• M79: 55,525,942 km (0.12 R)
• M80: 55,613,308 km (0.11 R)
• M81: 55,788,188 km (0.102 R)
• M82: 55,963,367 km (0.102 R)
• M83: 56,050,881 km (0.056 R)
• M84: 56,314,024 km (0.095 R)
• M85: 56,929,470 km (0.12 R)
• M86: 57,282,221 km (0.068 R)
• M87: 57,901,108 km (0.095 R)
• M88: 58,078,381 km (0.091 R)

Planet 6 - Ice Giant

Semi-Major Axis: 7.93 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 174.5

Radius: 6.8

Gravity: 3.77 G

Time & Orbit

Eccentricity (e): 0.242

Orbit Range: 6.01 AU - 9.85 AU

Year: 14892 Days

Day: 20.4 Hours

Environment

Temp: -230 °C

Axial Tilt: 20.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (91)

Outer Limit: 39,624,276 km

• M1: 91,105 km (0.076 R)
• M2: 157,227 km (0.113 R)
• M3: 204,949 km (0.103 R)
• M4: 770,279 km (0.084 R)
• M5: 816,804 km (0.092 R)
• M6: 979,268 km (0.108 R)
• M7: 1,242,261 km (0.113 R)
• M8: 1,546,842 km (0.069 R)
• M9: 2,591,484 km (0.084 R)
• M10: 2,807,204 km (0.083 R)
• M11: 3,053,891 km (0.05 R)
• M12: 3,205,284 km (0.089 R)
• M13: 3,282,028 km (0.1 R)
• M14: 3,889,694 km (0.102 R)
• M15: 4,192,480 km (0.091 R)
• M16: 4,417,476 km (0.077 R)
• M17: 4,791,769 km (0.101 R)
• M18: 4,938,375 km (0.082 R)
• M19: 4,997,466 km (0.042 R)
• M20: 5,206,006 km (0.042 R)
• M21: 5,724,512 km (0.05 R)
• M22: 5,942,925 km (0.065 R)
• M23: 6,777,532 km (0.086 R)
• M24: 7,614,232 km (0.103 R)
• M25: 7,958,008 km (0.062 R)
• M26: 8,062,128 km (0.109 R)
• M27: 8,166,697 km (0.119 R)
• M28: 8,625,215 km (0.067 R)
• M29: 8,732,177 km (0.064 R)
• M30: 10,275,579 km (0.058 R)
• M31: 11,000,979 km (0.103 R)
• M32: 11,078,321 km (0.116 R)
• M33: 11,350,439 km (0.113 R)
• M34: 11,467,724 km (0.094 R)
• M35: 11,901,259 km (0.101 R)
• M36: 12,824,876 km (0.091 R)
• M37: 12,987,938 km (0.105 R)
• M38: 13,192,587 km (0.109 R)
• M39: 14,231,993 km (0.08 R)
• M40: 14,443,076 km (0.11 R)
• M41: 15,039,523 km (0.111 R)
• M42: 15,557,131 km (0.057 R)
• M43: 15,861,862 km (0.069 R)
• M44: 16,212,520 km (0.088 R)
• M45: 16,565,571 km (0.079 R)
• M46: 16,610,001 km (0.108 R)
• M47: 17,189,693 km (0.074 R)
• M48: 17,595,103 km (0.025 R)
• M49: 17,685,460 km (0.089 R)
• M50: 18,003,505 km (0.119 R)
• M51: 18,277,569 km (0.052 R)
• M52: 18,369,123 km (0.069 R)
• M53: 19,154,362 km (0.09 R)
• M54: 20,044,918 km (0.099 R)
• M55: 21,044,830 km (0.029 R)
• M56: 21,092,851 km (0.087 R)
• M57: 21,671,795 km (0.09 R)
• M58: 22,012,130 km (0.073 R)
• M59: 22,109,668 km (0.085 R)
• M60: 22,403,029 km (0.114 R)
• M61: 22,845,689 km (0.03 R)
• M62: 24,140,459 km (0.07 R)
• M63: 24,190,724 km (0.094 R)
• M64: 25,050,612 km (0.094 R)
• M65: 25,101,476 km (0.079 R)
• M66: 25,458,865 km (0.107 R)
• M67: 26,281,653 km (0.08 R)
• M68: 26,540,607 km (0.079 R)
• M69: 26,852,519 km (0.072 R)
• M70: 27,479,932 km (0.069 R)
• M71: 28,962,447 km (0.107 R)
• M72: 29,069,260 km (0.105 R)
• M73: 29,713,428 km (0.089 R)
• M74: 29,929,148 km (0.089 R)
• M75: 30,579,450 km (0.071 R)
• M76: 30,688,358 km (0.092 R)
• M77: 31,673,759 km (0.106 R)
• M78: 31,949,318 km (0.114 R)
• M79: 32,004,520 km (0.09 R)
• M80: 32,280,977 km (0.052 R)
• M81: 32,447,329 km (0.08 R)
• M82: 33,283,133 km (0.111 R)
• M83: 33,844,125 km (0.026 R)
• M84: 34,578,201 km (0.118 R)
• M85: 35,203,521 km (0.078 R)
• M86: 35,260,517 km (0.051 R)
• M87: 35,374,660 km (0.078 R)
• M88: 36,292,294 km (0.104 R)
• M89: 36,465,229 km (0.071 R)
• M90: 36,696,208 km (0.094 R)
• M91: 39,446,415 km (0.086 R)

Kuiper Belt

Range: 30 - 46 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 492 - 18,768 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit