Kosmos 300
Kosmos 300 (Russian: Космос 300 meaning Cosmos 300) (Ye-8-5 series) was the fourth Soviet attempt at an unmanned lunar sample return. It was probably similar in design to the later Luna 16 spacecraft. It was launched, on a Proton rocket, on September 23, 1969. The mission was a failure. The engines on the Block D upper stage failed, leaving the spacecraft stranded in Earth orbit.
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| Venera 5 | Venera 6 | Kosmos 263 | Soyuz 4 | Soyuz 5 | 7K-L1 No.13L | OSO-5 | OPS 7585 | Kosmos 264 | US-A No.5 | Isis 1 | Meteor-1 No.11 | OPS 3890 · OPS 2644 | Intelsat III F-3 | Kosmos 265 | OPS 0757 | Luna E-8 No.201 | 7K-L1S No.3 | Mariner 6 | Kosmos 266 | ESSA-9 | Kosmos 267 | Apollo 9 | OPS 4248 | Kosmos 268 | Kosmos 269 | Kosmos 270 | Kosmos 271 | Kosmos 272 | OV1-17 · OV1-18 · OV1-19 · Orbiscal 2 | OPS 3722 · OPS 2285 | Kosmos 273 | Kosmos 274 | Meteor-1 No.12 | 2M No.521 | Mariner 7 | Kosmos 275 | 2M No.522 | Kosmos 276 | Kosmos 277 | Kosmos 278 | Molniya-1 No.16 | OPS 3148 | Nimbus 3 · SECOR 13 | Kosmos 279 | OPS 5310 | Kosmos 280 | OPS 1101 · OPS 1721 | Kosmos 281 | Apollo 10 | Kosmos 282 | Intelsat III F-4 | OPS 6909 · OPS 6911 · ERS-29 · ERS-26 · OV5-9 | Kosmos 283 | Kosmos 284 | Kosmos 285 | OPS 1077 | OGO-6 | Luna E-8-5 No.402 | Kosmos 286 | Explorer 41 | Kosmos 287 | Kosmos 288 | Biosatellite 3 | STV-2 | 7K-L1S No.5 | Kosmos 289 | Luna 15 | Apollo 11 | Kosmos 290 | Molniya-1 No.18 | OPS 1127 | DS-P1-Yu No.23 | OPS 3654 | Intelsat III F-5 | OPS 8285 | Kosmos 291 | Zond 7 | OSO-6 · PAC-1 | ATS-5 | Kosmos 292 | Kosmos 293 | Kosmos 294 | Kosmos 295 | OPS 7807 | Pioneer E · ERS-32 | Kosmos 296 | Kosmos 297 | Kosmos 298 | Kosmos 299 | Unnamed | OPS 3531 · OPS 4710 | Kosmos 300 | Kosmos 301 | OPS 7613 · NRL PL-161 · NRL PL-162 · NRL PL-163 · NRL PL-164 · NRL PL-176 · Timation 2 · Tempsat 2 · SOICAL Cone · SOICAL Cylinder | ESRO-1B | Meteor-1 No.15 | Soyuz 6 | Soyuz 7 | Soyuz 8 | Interkosmos 1 | Kosmos 302 | Kosmos 303 | Kosmos 304 | Kosmos 305 | Kosmos 306 | Kosmos 307 | OPS 8455 | Kosmos 308 | Azur | Kosmos 309 | Apollo 12 | Kosmos 310 | Skynet 1A | Kosmos 311 | Kosmos 312 | 7K-L1e No.1 | Kosmos 313 | OPS 6617 | Kosmos 314 | Kosmos 315 | Kosmos 316 | Kosmos 317 | Interkosmos 2 | Unnamed | | Payloads are separated by bullets ( · ), launches by pipes ( | ). Manned flights are indicated in bold text. Uncatalogued launch failures are listed in italics. Payloads deployed from other spacecraft are denoted in brackets. |
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