Todd Halvorson

Apollo astronauts Neil Armstrong, Jim Lovell, and Gene Cernan took exception with Obama's plan to cancel NASA's return-to-the-moon program, dubbed Project Constellation.

President Barack Obama will ask Congress to abandon NASA's current plans to return U.S. astronauts to the moon, but extend the space station through 2020

The director of NASA's embattled moon-Mars program says President Barack Obama's human spaceflight commission is making false claims about the advantages of alternatives.

NASA could save billions by dropping its new Ares I rocket and switching to a Delta 4 Heavy, but it would cost billions more, a new report says.

The United States cannot afford to return American astronauts to the moon under the NASA budget currently proposed by the Obama administration, a presidential panel said Wednesday.

A knob stuck against a window inside the shuttle Atlantis has put the shuttle in a tight spot.

NASA believes it may have isolated the source of a hydrogen gas leak that twice prevented launch of shuttle Endeavour.

NASA's Orion spaceship and the astronauts onboard might not survive an explosive launch failure of the agency's proposed Ares I moon rocket, analyses by Air Force safety experts show.

Lawmakers agreed Tuesday on a budget resolution that would eliminate a hard 2010 deadline for the retirement of NASA's shuttle fleet.

NASA will resume the retirement process for its three space shuttles on May 1.

The shuttle Discovery's planned Saturday landing will serve as a test for future heat shields.

Former NASA chief Mike Griffin says the new Ares I rocket is twice as safe as existing expendable boosters.

A grassroots effort hopes to reserve a NASA shuttle in Florida after the fleet's 2010 retirement.

A mock Orion capsule and launch abort tower arrived at NASA's spaceport Wednesday.

NASA pays tribute this week to astronauts who lost their lives in the line of duty.

NASA chief Michael Griffin expects to step down this month.

Bob Cabana will take the helm at Kennedy Space Center in mid-October.

Hubble astronauts arrived at NASA's Florida spaceport Sunday for launch practice.

NASA is now not expecting shuttle flight delays from Hurricane Ike.

NASA's Houston recovery from Hurricane Ike may delay two shuttle flights.

NASA's shuttle Atlantis gets a break in the weather for launch preparations.

NASA moves up the planned launch targets for its two remaining shuttle flights of the year.

NASA wants to move up launch dates for its next two shuttle missions.