* Astronomy

US defence firm Lockheed Martin says it has come under a significant cyber-attack, which took place last week.
Few details were available, but Lockheed said its security team had detected the threat quickly and ensured that none of its programmes had been compromised.
The Pentagon said it is working to establish the extent of the breach.
Lockheed makes fighter jets, warships and multi-billion dollar weapons systems sold worldwide.
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