Context:
NASA launched a robotic rescue mission to prevent the ageing Neil Gehrels Swift Observatory from falling towards Earth. The mission aims to tow the telescope into a stable orbit using a specialised spacecraft.
Explanation:
- Neil Gehrels Swift Observatory was launched by NASA in 2004 to study gamma-ray bursts (GRBs).
- Gamma-ray bursts are extremely energetic explosions linked to the death of massive stars or compact object mergers.
- Swift operates in Low Earth Orbit (LEO), around 600 km altitude.
- Satellites in LEO experience gradual orbital decay due to atmospheric drag.
- Without sufficient propulsion, ageing satellites may lose altitude and eventually burn up in Earth’s atmosphere.
- The rescue mission uses a robotic spacecraft designed to approach, latch on and tow Swift into a safer orbit.
- Such missions are part of on-orbit servicing, which includes satellite repair, refuelling, repositioning and debris management.
- It also reflects the growing importance of space sustainability and extending the life of costly scientific missions.
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