The shuttle Discovery, delayed a day by cloudy Florida weather, blazed across the heartland of America Tuesday, gliding to a pinpoint landing at the Kennedy Space Center to close out an extended space station assembly mission.

Credit: Stephen Clark/Spaceflight Now

Approaching the spaceport from the northwest, commander Alan Poindexter took over manual control at an altitude of 50,000 feet, guiding the shuttle through a 200-degree left turn to line up on runway 33. After giving pilot James Dutton a few moments of stick time, Poindexter flew the shuttle to a picture-perfect touchdown at 9:08:35 a.m. EDT.

"Wheels stopped, Houston," Poindexter radioed as Discovery rolled to a halt on the 300-foot-wide runway.

"Roger, wheels stopped, Discovery. Welcome home," called astronaut Rick Sturckow from mission control. "Dex, congratulations to you and the crew on an outstanding mission."

"Thanks for the words, it was a great mission, we enjoyed working with you and all the teams in mission control," Poindexter replied. "And we're glad the International Space Station is stocked up again. Thanks a lot."

The 131st shuttle mission covered 238 complete orbits and 6.2 million miles since blastoff April 5 for a mission duration of 15 days two hours 47 minutes and 10 seconds.

Poindexter, Dutton and their crewmates - flight engineer Dorothy Metcalf-Lindenburger, Stephanie Wilson, Japanese astronaut Naoko Yamazaki and spacewalkers Richard Mastracchio and Clayton Anderson - planned to doff their pressure suits and gather on the runway for a traditional walk-around inspection of the shuttle.

All seven astronauts plan to fly back to Houston early Wednesday after reunions with friends and family members.

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Already running a day late because of low clouds at the space center Monday, the astronauts were aiming for a 7:34 a.m. landing in Florida Tuesday, but nearby showers and concern about fog prompted entry Flight Director Bryan Lunney to order a one-orbit wave off.

As the sun came up, showers moved outside NASA's 30-nautical-mile safety zone, fog was minimal and Lunney cleared Poindexter to begin a descent that gave shuttle viewers in the continental United States a rare chance to witness the fiery streak of a shuttle re-entry.

In the wake of the 2003 Columbia disaster, NASA has favored southwest-to-northeast entry trajectories that carry the shuttle above the Pacific Ocean and the Caribbean, avoiding seasonal, potentially dangerous noctilucent clouds in the northern hemisphere.

The favored trajectories also require less propellant and, while not a requirement, keep descending shuttles well away from any densely populated areas in the United States.

Discovery's return was only the second so-called "descending node" entry since 2003. NASA managers ordered the change of plans to give the astronauts more time to complete the station resupply mission and to bring in a daylight landing opportunity at the end of a long flight. The high, icy clouds that can be a concern are not an issue at this time of year.

"The neat thing about the descending opportunities is it's going to come across the country and folks will get a good opportunity, hopefully, to see the orbiter as it goes overhead," Lunney said Sunday.

Credit: NASA

Discovery plunged back into the discernible atmosphere at an altitude of about 76 miles above the central Pacific Ocean south of the Aleutian Islands at 8:36 a.m., crossing the western Canadian coast near Vancouver at an altitude of about 40 miles.

With the shuttle surrounded by superheated plasma as atmospheric friction reduced its 5-mile-per-second orbital velocity, viewers in the west with a clear sky could expect to see a "streak of white light way up high," Lunney said. "When it's down lower, it's going to be more the glowing cloud plowing through. I think both will be clearly visible" weather permitting.

With its heat shield protecting the shuttle from temperatures of up to 3,000 degrees, Discovery sailed high above Helena, Mont., just west of Casper, Wyo., and across the northeastern corner of Colorado before descending across Kansas, Oklahoma and Arkansas, passing north of Little Rock before continuing across Mississippi, Alabama and Georgia.

The shuttle crossed into Florida and then passed east of Gainesville before beginning its final approach to the Kennedy Space Center.

"It was a beautiful entry this morning," Poindexter said before leaving the runway. "We got the bonus of coming over the entire United States and it was just absolutely gorgeous. The entry track took us over the Rockies and over the midwest and across the Mississippi delta, it was just a fantastic entry.

"The landing back here at the Kennedy Space Center was really nice. It's a beautiful day, it was a great mission and we're just happy to be back here in Florida with Discovery."

With Discovery back on the ground, engineers at the nearby Vehicle Assembly Building were readying the shuttle Atlantis for an overnight trip to launch pad 39A for liftoff May 14 on another space station assembly mission. It will be the 32nd and final planned flight for Atlantis as NASA faces the shuttle program's last three flights.

The final missions are devoted to delivering as much in the way of spare parts and supplies as possible before the shuttle fleet is retired and the station is dependent on less capable Russian, European and Japanese cargo craft.

Discovery's crew delivered more than 17,000 pounds of supplies, equipment and science gear and staged three spacewalks to replace an ammonia coolant tank o the station's main power truss. The new tank was successfully installed, but flight controllers were unable to pressurize the coolant loop because of trouble with a valve in an associated nitrogen tank.

Mission managers briefly considered asking Mastracchio and Anderson to carry out a fourth spacewalk to install a spare nitrogen tank. But after a detailed assessment, engineers concluded the coolant loop could be safely operated for at least a month without pressurization. As it now stands, the station's crew likely will stage a spacewalk later this spring to install a replacement tank.

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