Japan hopes to export the technology to the US and has offered to cover the costs of a line between New York and Washington DC.
The spacecraft – which unexpectedly discovered water on the planet closest to the sun – will slam into the planet at 8,750mph.
The problem – which saw Siri respond negatively to questions about homosexuality – was reportedly caused by a bug.
The unmanned New Horizons craft sends back a blurry photograph of the dwarf planet ahead of a flyby in July.
NASA says Dawn will explore why two visibly striking areas on the surface of Asteroid Belt body Ceres have different temperatures.