🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.28 AU

Composition

Type: Inner (Rocky/Metallic)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 0.55 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 268.3

Radius: 10.8

Gravity: 2.3 G

Time & Orbit

Eccentricity (e): 0.069

Orbit Range: 0.51 AU - 0.59 AU

Year: 287 Days

Day: 5.6 Hours

Environment

Temp: -154 °C

Axial Tilt: 9.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (31)

Outer Limit: 50,629,323 km

• M1: 137,929 km (0.062 R)
• M2: 229,483 km (0.099 R)
• M3: 328,517 km (0.119 R)
• M4: 428,897 km (0.065 R)
• M5: 528,230 km (0.11 R)
• M6: 613,800 km (0.093 R)
• M7: 691,441 km (0.105 R)
• M8: 772,823 km (0.103 R)
• M9: 901,776 km (0.097 R)
• M10: 1,010,384 km (0.106 R)
• M11: 1,082,341 km (0.116 R)
• M12: 1,149,660 km (0.092 R)
• M13: 1,281,904 km (0.075 R)
• M14: 1,353,562 km (0.1 R)
• M15: 1,490,294 km (0.057 R)
• M16: 1,646,624 km (0.109 R)
• M17: 1,717,533 km (0.101 R)
• M18: 1,881,792 km (0.085 R)
• M19: 2,011,493 km (0.117 R)
• M20: 2,079,410 km (0.082 R)
• M21: 2,156,453 km (0.075 R)
• M22: 2,246,810 km (0.115 R)
• M23: 2,363,646 km (0.096 R)
• M24: 2,547,203 km (0.115 R)
• M25: 2,629,781 km (0.114 R)
• M26: 2,704,580 km (0.096 R)
• M27: 2,860,610 km (0.11 R)
• M28: 2,960,392 km (0.084 R)
• M29: 3,047,309 km (0.081 R)
• M30: 3,153,972 km (0.107 R)
• M31: 3,271,107 km (0.048 R)

Planet 2 - Gas Giant

Semi-Major Axis: 0.57 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 966

Radius: 8.9

Gravity: 12.2 G

Time & Orbit

Eccentricity (e): 0.119

Orbit Range: 0.5 AU - 0.64 AU

Year: 302 Days

Day: 10.3 Hours

Environment

Temp: -142 °C

Axial Tilt: 20.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (48)

Outer Limit: 50,629,323 km

• M1: 125,064 km (0.098 R)
• M2: 199,264 km (0.099 R)
• M3: 281,992 km (0.029 R)
• M4: 363,972 km (0.07 R)
• M5: 437,574 km (0.037 R)
• M6: 540,348 km (0.103 R)
• M7: 602,281 km (0.102 R)
• M8: 670,348 km (0.058 R)
• M9: 741,557 km (0.117 R)
• M10: 823,237 km (0.093 R)
• M11: 891,903 km (0.113 R)
• M12: 975,229 km (0.099 R)
• M13: 1,078,900 km (0.116 R)
• M14: 1,186,461 km (0.046 R)
• M15: 1,330,823 km (0.101 R)
• M16: 1,422,227 km (0.064 R)
• M17: 1,481,169 km (0.048 R)
• M18: 1,545,944 km (0.109 R)
• M19: 1,606,532 km (0.081 R)
• M20: 1,678,339 km (0.083 R)
• M21: 1,878,800 km (0.111 R)
• M22: 1,992,943 km (0.039 R)
• M23: 2,115,015 km (0.067 R)
• M24: 2,171,413 km (0.119 R)
• M25: 2,262,668 km (0.092 R)
• M26: 2,343,600 km (0.067 R)
• M27: 2,407,778 km (0.109 R)
• M28: 2,466,719 km (0.09 R)
• M29: 2,670,920 km (0.074 R)
• M30: 2,843,257 km (0.117 R)
• M31: 2,962,187 km (0.067 R)
• M32: 3,051,049 km (0.045 R)
• M33: 3,147,090 km (0.108 R)
• M34: 3,276,792 km (0.104 R)
• M35: 3,349,048 km (0.072 R)
• M36: 3,421,602 km (0.069 R)
• M37: 3,528,266 km (0.072 R)
• M38: 3,751,765 km (0.103 R)
• M39: 3,889,545 km (0.1 R)
• M40: 3,945,195 km (0.091 R)
• M41: 4,028,970 km (0.117 R)
• M42: 4,134,736 km (0.1 R)
• M43: 4,234,069 km (0.084 R)
• M44: 4,421,066 km (0.045 R)
• M45: 4,486,291 km (0.046 R)
• M46: 4,669,548 km (0.086 R)
• M47: 4,780,550 km (0.108 R)
• M48: 5,119,239 km (0.048 R)

Planet 3 - Gas Giant

Semi-Major Axis: 2.99 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 675.5

Radius: 9.4

Gravity: 7.64 G

Time & Orbit

Eccentricity (e): 0.061

Orbit Range: 2.81 AU - 3.17 AU

Year: 3634 Days

Day: 12 Hours

Environment

Temp: -213 °C

Axial Tilt: 13.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (79)

Outer Limit: 50,629,323 km

• M1: 134,189 km (0.093 R)
• M2: 195,824 km (0.119 R)
• M3: 275,260 km (0.115 R)
• M4: 403,615 km (0.117 R)
• M5: 472,280 km (0.114 R)
• M6: 584,030 km (0.079 R)
• M7: 674,387 km (0.079 R)
• M8: 939,624 km (0.087 R)
• M9: 1,276,519 km (0.111 R)
• M10: 1,621,043 km (0.079 R)
• M11: 1,871,918 km (0.057 R)
• M12: 1,932,804 km (0.116 R)
• M13: 2,025,406 km (0.052 R)
• M14: 2,103,645 km (0.091 R)
• M15: 2,460,436 km (0.116 R)
• M16: 2,697,549 km (0.115 R)
• M17: 2,889,184 km (0.077 R)
• M18: 3,085,157 km (0.106 R)
• M19: 3,194,064 km (0.085 R)
• M20: 3,285,618 km (0.059 R)
• M21: 3,528,116 km (0.119 R)
• M22: 3,661,109 km (0.083 R)
• M23: 4,149,845 km (0.086 R)
• M24: 4,250,076 km (0.117 R)
• M25: 4,638,432 km (0.1 R)
• M26: 5,145,269 km (0.089 R)
• M27: 5,405,270 km (0.12 R)
• M28: 5,558,907 km (0.087 R)
• M29: 5,625,329 km (0.106 R)
• M30: 5,691,900 km (0.077 R)
• M31: 6,006,055 km (0.089 R)
• M32: 6,188,266 km (0.106 R)
• M33: 7,222,436 km (0.112 R)
• M34: 7,319,076 km (0.087 R)
• M35: 8,032,807 km (0.049 R)
• M36: 8,309,414 km (0.036 R)
• M37: 8,691,636 km (0.105 R)
• M38: 8,975,573 km (0.048 R)
• M39: 9,315,011 km (0.071 R)
• M40: 9,420,328 km (0.116 R)
• M41: 9,526,093 km (0.095 R)
• M42: 10,087,534 km (0.116 R)
• M43: 10,413,358 km (0.112 R)
• M44: 11,186,779 km (0.073 R)
• M45: 11,411,026 km (0.082 R)
• M46: 11,835,884 km (0.105 R)
• M47: 11,950,028 km (0.087 R)
• M48: 12,323,424 km (0.074 R)
• M49: 12,700,859 km (0.032 R)
• M50: 12,847,016 km (0.079 R)
• M51: 12,934,980 km (0.084 R)
• M52: 13,825,536 km (0.068 R)
• M53: 13,945,813 km (0.047 R)
• M54: 14,036,319 km (0.065 R)
• M55: 14,126,826 km (0.088 R)
• M56: 14,308,737 km (0.056 R)
• M57: 14,521,765 km (0.095 R)
• M58: 15,728,271 km (0.099 R)
• M59: 15,790,953 km (0.068 R)
• M60: 16,137,571 km (0.082 R)
• M61: 16,742,096 km (0.057 R)
• M62: 17,256,862 km (0.113 R)
• M63: 17,711,640 km (0.063 R)
• M64: 18,666,224 km (0.076 R)
• M65: 18,799,067 km (0.117 R)
• M66: 18,898,998 km (0.093 R)
• M67: 19,166,479 km (0.076 R)
• M68: 19,300,519 km (0.079 R)
• M69: 19,772,500 km (0.101 R)
• M70: 20,214,263 km (0.043 R)
• M71: 20,384,954 km (0.041 R)
• M72: 20,521,986 km (0.062 R)
• M73: 20,590,501 km (0.034 R)
• M74: 20,762,389 km (0.118 R)
• M75: 21,873,153 km (0.1 R)
• M76: 22,083,638 km (0.115 R)
• M77: 22,224,260 km (0.119 R)
• M78: 22,612,616 km (0.088 R)
• M79: 24,043,669 km (0.104 R)

Planet 4 - Ice Giant

Semi-Major Axis: 6.76 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 288.5

Radius: 3.1

Gravity: 30.02 G

Time & Orbit

Eccentricity (e): 0.223

Orbit Range: 5.25 AU - 8.27 AU

Year: 12355 Days

Day: 17.8 Hours

Environment

Temp: -233 °C

Axial Tilt: 13.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (94)

Outer Limit: 50,629,323 km

• M1: 155,432 km (0.094 R)
• M2: 221,854 km (0.095 R)
• M3: 264,190 km (0.068 R)
• M4: 420,071 km (0.038 R)
• M5: 500,704 km (0.049 R)
• M6: 661,223 km (0.083 R)
• M7: 723,455 km (0.066 R)
• M8: 938,876 km (0.119 R)
• M9: 1,135,897 km (0.093 R)
• M10: 1,248,693 km (0.111 R)
• M11: 1,287,140 km (0.107 R)
• M12: 1,345,483 km (0.118 R)
• M13: 1,608,476 km (0.12 R)
• M14: 1,909,168 km (0.119 R)
• M15: 1,931,309 km (0.07 R)
• M16: 2,296,926 km (0.115 R)
• M17: 2,536,282 km (0.049 R)
• M18: 2,658,953 km (0.095 R)
• M19: 2,986,721 km (0.071 R)
• M20: 3,221,141 km (0.106 R)
• M21: 4,332,504 km (0.064 R)
• M22: 4,597,442 km (0.083 R)
• M23: 4,897,984 km (0.094 R)
• M24: 5,486,352 km (0.082 R)
• M25: 5,644,776 km (0.115 R)
• M26: 6,162,086 km (0.106 R)
• M27: 6,492,996 km (0.108 R)
• M28: 6,526,506 km (0.059 R)
• M29: 6,829,741 km (0.085 R)
• M30: 6,897,808 km (0.089 R)
• M31: 7,520,135 km (0.082 R)
• M32: 7,873,486 km (0.072 R)
• M33: 7,909,090 km (0.042 R)
• M34: 8,160,115 km (0.12 R)
• M35: 8,377,331 km (0.084 R)
• M36: 8,413,683 km (0.092 R)
• M37: 8,633,144 km (0.069 R)
• M38: 8,706,746 km (0.115 R)
• M39: 9,040,349 km (0.071 R)
• M40: 9,643,677 km (0.101 R)
• M41: 10,182,229 km (0.071 R)
• M42: 11,328,448 km (0.068 R)
• M43: 12,183,550 km (0.096 R)
• M44: 12,681,561 km (0.099 R)
• M45: 12,890,998 km (0.114 R)
• M46: 12,933,035 km (0.12 R)
• M47: 13,869,069 km (0.077 R)
• M48: 14,563,353 km (0.113 R)
• M49: 15,003,021 km (0.094 R)
• M50: 15,447,027 km (0.041 R)
• M51: 16,942,707 km (0.112 R)
• M52: 17,312,214 km (0.116 R)
• M53: 18,626,132 km (0.096 R)
• M54: 19,535,836 km (0.044 R)
• M55: 20,803,977 km (0.095 R)
• M56: 21,001,447 km (0.092 R)
• M57: 21,497,812 km (0.09 R)
• M58: 23,060,811 km (0.075 R)
• M59: 23,367,636 km (0.116 R)
• M60: 23,572,884 km (0.059 R)
• M61: 23,727,120 km (0.074 R)
• M62: 24,295,891 km (0.063 R)
• M63: 24,764,581 km (0.031 R)
• M64: 26,401,481 km (0.105 R)
• M65: 26,561,700 km (0.09 R)
• M66: 28,127,541 km (0.116 R)
• M67: 28,674,321 km (0.116 R)
• M68: 28,784,126 km (0.083 R)
• M69: 28,894,081 km (0.096 R)
• M70: 30,056,606 km (0.059 R)
• M71: 30,112,406 km (0.109 R)
• M72: 31,008,946 km (0.113 R)
• M73: 31,121,593 km (0.099 R)
• M74: 31,573,827 km (0.106 R)
• M75: 32,656,168 km (0.117 R)
• M76: 32,713,464 km (0.038 R)
• M77: 33,288,369 km (0.116 R)
• M78: 34,157,083 km (0.03 R)
• M79: 34,331,664 km (0.113 R)
• M80: 35,621,198 km (0.07 R)
• M81: 35,739,231 km (0.113 R)
• M82: 36,212,708 km (0.073 R)
• M83: 36,450,120 km (0.093 R)
• M84: 37,105,807 km (0.096 R)
• M85: 37,525,130 km (0.094 R)
• M86: 37,885,661 km (0.114 R)
• M87: 38,731,637 km (0.094 R)
• M88: 38,913,697 km (0.08 R)
• M89: 39,035,320 km (0.057 R)
• M90: 39,217,830 km (0.086 R)
• M91: 40,073,530 km (0.075 R)
• M92: 40,750,161 km (0.08 R)
• M93: 40,811,945 km (0.114 R)
• M94: 40,997,147 km (0.067 R)

Planet 5 - Ice Giant

Semi-Major Axis: 8.38 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 947.7

Radius: 7.7

Gravity: 15.98 G

Time & Orbit

Eccentricity (e): 0.114

Orbit Range: 7.42 AU - 9.34 AU

Year: 17052 Days

Day: 22.1 Hours

Environment

Temp: -241 °C

Axial Tilt: 41.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (94)

Outer Limit: 50,629,323 km

• M1: 171,888 km (0.108 R)
• M2: 471,832 km (0.074 R)
• M3: 659,727 km (0.084 R)
• M4: 1,131,857 km (0.104 R)
• M5: 1,242,859 km (0.075 R)
• M6: 1,786,348 km (0.12 R)
• M7: 1,850,974 km (0.05 R)
• M8: 2,049,491 km (0.087 R)
• M9: 3,064,961 km (0.101 R)
• M10: 3,221,291 km (0.114 R)
• M11: 3,664,549 km (0.111 R)
• M12: 3,872,341 km (0.042 R)
• M13: 3,956,564 km (0.074 R)
• M14: 4,386,958 km (0.09 R)
• M15: 4,832,161 km (0.07 R)
• M16: 5,717,481 km (0.1 R)
• M17: 6,302,109 km (0.062 R)
• M18: 6,351,626 km (0.064 R)
• M19: 6,803,861 km (0.044 R)
• M20: 6,905,737 km (0.106 R)
• M21: 7,527,615 km (0.094 R)
• M22: 7,792,104 km (0.115 R)
• M23: 8,494,018 km (0.117 R)
• M24: 9,442,169 km (0.032 R)
• M25: 9,498,866 km (0.093 R)
• M26: 9,899,789 km (0.097 R)
• M27: 10,540,965 km (0.094 R)
• M28: 11,135,617 km (0.025 R)
• M29: 11,376,469 km (0.111 R)
• M30: 12,481,549 km (0.112 R)
• M31: 12,606,313 km (0.047 R)
• M32: 12,731,676 km (0.032 R)
• M33: 13,110,159 km (0.066 R)
• M34: 13,364,475 km (0.101 R)
• M35: 13,492,232 km (0.06 R)
• M36: 13,556,260 km (0.091 R)
• M37: 14,792,387 km (0.083 R)
• M38: 15,860,965 km (0.119 R)
• M39: 16,472,970 km (0.049 R)
• M40: 19,140,898 km (0.071 R)
• M41: 19,864,952 km (0.085 R)
• M42: 22,544,998 km (0.054 R)
• M43: 23,079,212 km (0.112 R)
• M44: 23,617,614 km (0.079 R)
• M45: 25,573,906 km (0.062 R)
• M46: 28,152,823 km (0.065 R)
• M47: 28,398,762 km (0.105 R)
• M48: 30,813,272 km (0.103 R)
• M49: 32,258,986 km (0.095 R)
• M50: 32,344,705 km (0.113 R)
• M51: 33,033,304 km (0.115 R)
• M52: 33,119,772 km (0.088 R)
• M53: 33,206,239 km (0.117 R)
• M54: 34,600,192 km (0.105 R)
• M55: 35,216,087 km (0.109 R)
• M56: 35,658,298 km (0.077 R)
• M57: 36,191,166 km (0.106 R)
• M58: 36,458,647 km (0.089 R)
• M59: 38,804,192 km (0.05 R)
• M60: 39,535,725 km (0.117 R)
• M61: 39,903,138 km (0.074 R)
• M62: 41,757,403 km (0.099 R)
• M63: 41,850,902 km (0.071 R)
• M64: 42,319,143 km (0.07 R)
• M65: 42,506,889 km (0.055 R)
• M66: 42,977,673 km (0.093 R)
• M67: 44,973,458 km (0.119 R)
• M68: 46,611,106 km (0.091 R)
• M69: 47,583,492 km (0.078 R)
• M70: 48,857,617 km (0.101 R)
• M71: 49,944,446 km (0.11 R)
• M72: 52,041,509 km (0.068 R)
• M73: 53,151,375 km (0.099 R)
• M74: 55,189,198 km (0.065 R)
• M75: 55,291,822 km (0.045 R)
• M76: 56,114,610 km (0.095 R)
• M77: 56,217,683 km (0.056 R)
• M78: 57,044,959 km (0.106 R)
• M79: 57,356,272 km (0.113 R)
• M80: 57,564,213 km (0.095 R)
• M81: 58,189,233 km (0.098 R)
• M82: 58,921,216 km (0.111 R)
• M83: 63,269,727 km (0.056 R)
• M84: 63,699,521 km (0.027 R)
• M85: 65,428,274 km (0.087 R)
• M86: 66,516,449 km (0.113 R)
• M87: 67,830,218 km (0.036 R)
• M88: 70,372,185 km (0.11 R)
• M89: 71,487,138 km (0.111 R)
• M90: 71,710,787 km (0.07 R)
• M91: 72,046,783 km (0.111 R)
• M92: 73,960,439 km (0.07 R)
• M93: 74,639,763 km (0.053 R)
• M94: 75,548,869 km (0.104 R)

Planet 6 - Ice Giant

Semi-Major Axis: 8.83 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 237.3

Radius: 7.8

Gravity: 3.9 G

Time & Orbit

Eccentricity (e): 0.189

Orbit Range: 7.16 AU - 10.5 AU

Year: 18444 Days

Day: 21.1 Hours

Environment

Temp: -238 °C

Axial Tilt: 37 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (88)

Outer Limit: 50,629,323 km

• M1: 105,317 km (0.109 R)
• M2: 171,888 km (0.077 R)
• M3: 250,726 km (0.058 R)
• M4: 442,211 km (0.12 R)
• M5: 713,582 km (0.066 R)
• M6: 915,090 km (0.095 R)
• M7: 1,134,849 km (0.097 R)
• M8: 1,197,830 km (0.107 R)
• M9: 1,261,858 km (0.108 R)
• M10: 1,438,683 km (0.059 R)
• M11: 1,791,734 km (0.097 R)
• M12: 2,042,011 km (0.108 R)
• M13: 2,197,593 km (0.058 R)
• M14: 3,121,210 km (0.081 R)
• M15: 3,988,279 km (0.077 R)
• M16: 4,216,117 km (0.078 R)
• M17: 4,348,361 km (0.069 R)
• M18: 4,515,462 km (0.112 R)
• M19: 5,454,189 km (0.094 R)
• M20: 6,150,118 km (0.072 R)
• M21: 7,029,604 km (0.078 R)
• M22: 7,147,188 km (0.11 R)
• M23: 7,503,829 km (0.118 R)
• M24: 7,584,014 km (0.095 R)
• M25: 8,152,486 km (0.087 R)
• M26: 8,317,342 km (0.096 R)
• M27: 8,650,646 km (0.118 R)
• M28: 9,763,655 km (0.056 R)
• M29: 10,381,494 km (0.12 R)
• M30: 10,605,292 km (0.096 R)
• M31: 10,830,587 km (0.108 R)
• M32: 12,074,493 km (0.084 R)
• M33: 12,262,687 km (0.093 R)
• M34: 12,404,356 km (0.107 R)
• M35: 13,314,659 km (0.086 R)
• M36: 13,508,987 km (0.112 R)
• M37: 13,851,416 km (0.107 R)
• M38: 13,900,634 km (0.082 R)
• M39: 14,147,171 km (0.113 R)
• M40: 14,845,494 km (0.103 R)
• M41: 15,453,011 km (0.101 R)
• M42: 16,275,500 km (0.12 R)
• M43: 16,327,411 km (0.088 R)
• M44: 17,006,884 km (0.074 R)
• M45: 19,484,375 km (0.055 R)
• M46: 23,055,874 km (0.117 R)
• M47: 23,347,889 km (0.087 R)
• M48: 23,817,477 km (0.098 R)
• M49: 24,766,227 km (0.115 R)
• M50: 24,945,595 km (0.058 R)
• M51: 25,425,654 km (0.108 R)
• M52: 26,456,234 km (0.084 R)
• M53: 28,058,427 km (0.108 R)
• M54: 31,938,996 km (0.12 R)
• M55: 32,134,071 km (0.058 R)
• M56: 32,264,521 km (0.113 R)
• M57: 32,656,467 km (0.082 R)
• M58: 32,787,515 km (0.076 R)
• M59: 32,984,386 km (0.111 R)
• M60: 33,115,882 km (0.092 R)
• M61: 33,511,269 km (0.115 R)
• M62: 34,974,486 km (0.079 R)
• M63: 35,444,523 km (0.086 R)
• M64: 35,849,035 km (0.113 R)
• M65: 36,526,564 km (0.058 R)
• M66: 36,594,482 km (0.059 R)
• M67: 37,276,648 km (0.112 R)
• M68: 37,413,679 km (0.034 R)
• M69: 37,756,707 km (0.107 R)
• M70: 37,894,188 km (0.048 R)
• M71: 38,376,940 km (0.085 R)
• M72: 38,792,224 km (0.095 R)
• M73: 39,000,464 km (0.098 R)
• M74: 39,209,004 km (0.054 R)
• M75: 39,417,992 km (0.088 R)
• M76: 39,697,291 km (0.119 R)
• M77: 44,035,629 km (0.117 R)
• M78: 44,833,883 km (0.099 R)
• M79: 45,636,925 km (0.111 R)
• M80: 46,371,002 km (0.066 R)
• M81: 46,591,958 km (0.034 R)
• M82: 47,257,070 km (0.101 R)
• M83: 47,553,722 km (0.097 R)
• M84: 47,850,824 km (0.036 R)
• M85: 47,925,323 km (0.074 R)
• M86: 48,297,822 km (0.118 R)
• M87: 49,496,550 km (0.033 R)
• M88: 49,647,195 km (0.029 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: 228 - 13,995 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit