"I think the range of science questions that are there, and the methodologies and types of vehicle that we use to address that science, is going to follow very much the Mars model - we'll have one mission building on the success of another and exploring different questions, " he told BBC News.

BBC: 'Boat' could explore Saturn moon

And while there is a complex set of legal technical and policy questions around these issues, we are exploring all possible options.

WHITEHOUSE: Press Briefing

While governments wrestle with financial questions, engineers from academia and the corporate sector are exploring various ideas for making CCS more efficient and thus cheaper.

BBC: Whatever happened to carbon capture?

The Refugee Action group said questions remained about the proposals but it was encouraged ministers were exploring a "practical global programme to help address the world's refugee crisis".

BBC: Blunkett extends asylum powers

He questions why the idea of human nature has become a taboo subject, exploring "hot buttons" like violence, gender and aggression.

BBC: Aventis science prize 2003 - Pinker

To emphasize how Autonomy would transform HP into a software giant focused on high-profit business customers, and, perhaps, to forestall some nagging questions about PCs and the tablet failure, HP also announced that it was exploring the sale or spinoff of the PC business and that it was closing the WebOS device business.

FORBES: HP's $12 Billion Conference Call