NASA Skips First Space Shuttle Landing Attempt Today

Discovery Astronauts Hope to Land Space Shuttle Monday
A portion of the aft section of the space shuttle Discovery, Mexico, Baja California, and the Gulf of California (Sea of Cortez) are featured in this image photographed by an Expedition 23 astronaut on the International Space Station while the shuttle was docked on April 13, 2010 during the STS-131 mission. (Image credit: NASA)

NASA ordered astronauts aboard the spaceshuttle Discovery to skip their first landing attempt Monday because of rainand low clouds at their Florida landing site, leaving the shuttle one morechance to try to return to Earth today.

Discovery'screw of seven astronauts is returning to Earth after resupplying theInternational Space Station with tons of fresh supplies and new scienceequipment. NASA hoped to land the shuttle at the Kennedy Space Center inFlorida at 8:48 a.m. EDT (1248 GMT), but thick clouds obscured the runway and rainshowers were creeping too close to allow Discovery's return.

"We're going to wave off for the first opportunitytoday," Mission Control radioed the shuttle astronauts.

The shuttle is now targeted to land inFlorida at 10:23 a.m. EDT (1423 GMT), though only if Mother Nature gives Discovery'sastronauts a break in the weather.

"Thanks a lot, we know you guys are working it hard,we look forward to maybe an improved weather picture in about an hour and ahalf," Discovery commander Alan Poindexter told Mission Control.

NASA flight rules forbid space shuttles fromlanding in the rain because it can damage their fragile heat shield tiles,among other risks. Low cloud ceilings, like the one that thwarted today's firstlanding attempt, are also a problem because they affect runway visibility forshuttle commanders and pilots.

Discovery will be flying across the UnitedStates from the northwest to southeast when it re-enters Earth's atmosphere andmay be visible to observers on the ground. [Howto see Discovery's re-entry from Earth.]

The shuttle will re-enter the atmosphere overthe northern Pacific Ocean, then fly to the south of Seattle, Wash., and overRock Springs, Wyoming, northeast of Denver, Colo., Tulsa, Okla., Little Rock,Ark., southeast of Montgomery, Ala., and south of Tallahassee, Fla., beforelanding at the Kennedy Space Center.

Weather conditions in Florida are expected toimprove slightly on Tuesday, when NASA will have two different landing sites tochoose from. In addition to the primary shuttle landing site in Florida, thespace agency will activate a backup runway at Edwards Air Force Base inCalifornia.

The weather in California is also expected tobe relatively clear. But NASA prefers to land Discovery in Florida ? theshuttle fleet's home port and launch site ? since it saves about a week of timeand $1.8 million in transport costs to ferry the spacecraft home fromCalifornia atop a modified Boeing 747 jumbo jet.

Discovery has enough supplies to remain inspace until Wednesday, but NASA wants to land the shuttle by Tuesday in orderto keep one day in reserve in case of an unexpected malfunction.

Discoverylaunched into space on April 5 on what has become a 14-day mission todeliver new science experiment equipment, supplies and big spare parts to theInternational Space Station. The astronauts performed three tough spacewalks toreplace an ammonia coolant tank outside the station.

A stuck valve inside the new tank has kept itfrom working properly, but Mission Control opted to have station astronauts fixit later on future spacewalk.

This mission is one of NASA's last fewshuttle flights before the space plane fleet is retired in September. It is thesecond-to-last mission for Discovery, which is NASA's oldest space shuttle.

After this flight, only three more shuttlemissions remain. ? is providing complete coverage ofDiscovery's STS-131 mission to the International Space Station with ManagingEditor Tariq Malik and Staff Writer Clara Moskowitz based in New York. Click here for shuttlemission updates and a link to NASA TV.

Join our Space Forums to keep talking space on the latest missions, night sky and more! And if you have a news tip, correction or comment, let us know at:

Tariq Malik

Tariq is the Editor-in-Chief of and joined the team in 2001, first as an intern and staff writer, and later as an editor. He covers human spaceflight, exploration and space science, as well as skywatching and entertainment. He became's Managing Editor in 2009 and Editor-in-Chief in 2019. Before joining, Tariq was a staff reporter for The Los Angeles Times covering education and city beats in La Habra, Fullerton and Huntington Beach. In October 2022, Tariq received the Harry Kolcum Award for excellence in space reporting from the National Space Club Florida Committee. He is also an Eagle Scout (yes, he has the Space Exploration merit badge) and went to Space Camp four times as a kid and a fifth time as an adult. He has journalism degrees from the University of Southern California and New York University. You can find Tariq at and as the co-host to the This Week In Space podcast with space historian Rod Pyle on the TWiT network. To see his latest project, you can follow Tariq on Twitter @tariqjmalik.