In the first interview since the death of his daughter Peaches Geldof, Sir Bob told ITV's Lorraine about his "intolerable" grief.
The band which brought Bob Geldolf to fame, The Boomtown Rats, are the latest act to jump on the reunion bandwagon.
Bob Geldof says G8 leaders are more than capable of ending poverty and that they have failed to adhere to previous aid targets.
Sir Bob Geldof said his friend Billy Connolly is "as strong as an ox" and backed the comedian not to be deterred by the initial stages of Parkinson's disease and his surgery for prostate cancer.
Sir Bob told Channel 5 News: "Pam [his wife] and Bill are great mates. He’s as strong as an ox mentally from everything he’s been through as a kid. So I don’t think this will deter him from being that individual that we know.”
Bob Geldof is set to blast off into space as a passenger on a commercial flight.
The singer was offered the trip after his band, the Boomtown Rats, agreed to play a concert at a charity ball at the Natural History Museum, London, where seats on the flight will be auctioned off for good causes.
He said: "Being the first Irishman in space is not only a fantastic honour but pretty mind-blowing...The First Rock Astronaut - Space Rat! Elvis may have left the building but Bob Geldof will have left the planet! Wild!"
The flights, which will take place in 2015, will be auctioned at the high-society event next month along with a diamond-encrusted watch and a car ride with former Formula One drivers.
Peaches Geldof has given birth to her second baby - on what would have been her mother's birthday
The former wildchild, 24, who already has a son called Astala with husband Thomas Cohen, gave birth on Wednesday to a boy called Phaedra, her spokeswoman said.
Geldof's mother, Paula Yates, died of a drug overdose in 2000.
The couple married last year in Kent.
Bob Geldof tells me he's escaping London during the Olympics as he's already fed up with traffic disruption.
We're at a pre-Olympics party hosted by Brad Pitt and Angelina Jolie at the V&A museum.
So far we have also seen Victoria Hervey, Boris Becker and Nancy Dell'Olio walk the red carpet.
Celebrity campaigner Bob Geldof says the G8 Nations can and should do more to help countries like Ethiopia.
He also talked about the concept of "food security" which is something the Obama government are set to make a number of pledges on during the G8 meeting next week. Food security is a term used to describe both the availability and access to food for the world's poorest.
Food security across the continent of Africa is being threatened by the continuing rise of food prices.
Bob Geldof tells ITV News that the G8 leaders meeting later this week are more than capable of ending poverty.
Watch our exclusive report on ITV News at 6.30 as he returns to Ethiopia to show world leaders why they shouldn't forget.