Alaska voters overwhelmingly passed a ballot measure Tuesday creating the Alaska Natural Gas Development Authority as a public corporation, giving the state the power to buy North Slope gas and build a pipeline to move it to market. Actual construction of a pipeline through Alaska, however, still hinges on the support of the gas industry, which has said the project may not be economically feasible. Ballot Measure 3, approved with 61% of the vote, gives the new agency authority that includes "buying property or taking it by eminent domain, and to issue tax-exempt revenue bonds." The proposed pipeline would run from Prudhoe Bay to Prince William Sound rather than along the Alaska Highway, which is the route favored by Democratic Gov. Tony Knowles and Gov.-elect Frank Murkowski, a Republican.