numerous objects what could have been harmless pieces of ice and one much larger, more distinct piece of debris slowly floating away. It was not clear whether the objects originated from the shuttle or the space station. Around 21:30 UTC, Commander Sturckow reported yet another piece of debris leaving the area of Atlantis. Sturckow identified them to the mission control in Houston as "little phenolic-looking, kind of tan-looking washers with four slots" that are used to tie down the Multi-Layer Insulation blankets in the payload bay. Later in the day, Pilot Archambault, Mission Specialists Forrester and Swanson used the shuttle's robot arm to lift the Orbiter Boom Sensor System to conduct a late inspection of the thermal protection system on both wings and the orbiter's nose cap. During the day, Astronaut Sunita Williams, in the 192nd day of her spaceflight, did more exercise to help prepare her to gravity back on Earth. June 20 (Flight day 13) Atlantis did various hardware tests to prepare for a landing on June 21, 2007, and the crew had an interview with several large TV networks. June 21 (Flight day 14 – Scrubbed landing)Atlantis closed its payload bay doors and made various preparations for landing, but had to stay in orbit after both landing opportunities at Kennedy Space Center were scrubbed due to bad weather conditions. June 22 (Flight day 15 – Landing) Flight day 15 saw Space Shuttle Atlantis returned to Earth after a successful mission to the Space Station. Earlier in the day, the flight controllers kept a close eye on weather. Atlantis again closed its payload bay doors and made preparations for landing. Atlantis had five opportunities to land (two at Kennedy Space Center, three at Edwards Air Force Base, California). The first and second landing attempts on Orbit 218 and 219 in Florida were scrubbed due to showers, thunderstorms and low clouds at Kennedy Space Center. So flight controllers took their first chance at Edwards Air Force Base, where weather was ideal for the landing. Flying upside down and backward over the Indian Ocean, the deorbit burn was initiated by Commander Rick Sturckow and Pilot Lee Archambault. They fired Atlantis twin OMS Pods at 18:43:47 UTC for 2 minutes and 33 seconds, slowing the ship by about 200 mph. This was enough to drop the shuttle into the atmosphere for an hour-long glide back to Earth. As the shuttle descended