- 17 updates
Astronomer Dr David Whitehouse told Sky News that Sir Patrick Moore had "loved astronomy more than he loved himself".
Fellow broadcasters have been sharing their tributes to Sir Patrick Moore on Twitter:
The last Sky At Night programme was broadcast on Monday.
Sir Patrick has only missed one episode since it began, on 24th April 1957, when he was struck down by food poisoning.
His trademark monocle, unique delivery and occasional performances on the xylophone made him a familiar target for satirists and impressionists, but his scientific credentials were never in doubt.
The show's guests have included many prominent scientists as well as Goon Show star Michael Bentine and astronauts Neil Armstrong and Buzz Aldrin.
But the demands of live television have led to the occasional blooper, with Sir Patrick famously once swallowing a fly live on air.
Actor and singer John Barrowman has tweeted his sorrow at the death of Sir Patrick Moore:
Queen guitarist Brian May paid tribute to Sir Patrick Moore, calling him a "dear friend and a kind of father figure to me".
He said: "Patrick will be mourned by the many to whom he was a caring uncle, and by all who loved the delightful wit and clarity of his writings, or enjoyed his fearlessly eccentric persona in public life.
"Patrick is irreplaceable. There will never be another Patrick Moore. But we were lucky enough to get one."
Astronomer Sir Patrick Moore died today aged 89, a group of his friends and staff said.
The broadcaster "passed away peacefully at 12.25pm this afternoon", at his home in Selsey, West Sussex, they said in a statement:
"After a short spell in hospital last week, it was determined that no further treatment would benefit him, and it was his wish to spend his last days in his own home, Farthings, where he today passed on, in the company of close friends and carers and his cat Ptolemy."