The head of a House panel said Tuesday there is "no way" the space agency's $11.5 billion 1989 budget request can be approved, but NASA chief James Fletcher said choosing where to cut would be like deciding which of his children to murder. At the start of three days of hearings on the NASA budget proposed by President Reagan, the House appropriations subcommittee said the agency's request was competing with other compelling needs, such as clean lakes and homeless aid. "There is no way we can deliver $11.5 billion for NASA in 1989," said Rep. Edward Boland, D-Mass., chairman of the subcommittee.