Massive asteroid with moon to pass Earth today

An asteroid nearly two miles (three kilometers) wide is set to pass by Earth Friday with no risk of impact, offering scientists a rare chance to study a massive flying object with its own moon.

Astronauts aim to fix ammonia leak at space station

Two astronauts are preparing to step out on a spacewalk to try and fix an ammonia leak at the International Space Station, in a hastily arranged venture outside the orbiting lab, NASA said Friday.

Obama's budget would boost science, health (Update)

The budget proposal that US President Barack Obama released Wednesday would boost funds for major science and health programs while making cuts at NASA and the Environmental Protection Agency.

NASA denies report that Voyager left solar system

The US space agency on Wednesday denied a claim made in a scientific study that its Voyager 1 spacecraft had left the solar system, describing the report as "premature."

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