The shuttle and station crewmembers float into the newly-opened Kibo lab. Credit: NASA TV

The 10 astronauts aboard the shuttle-space station complex opened up the newly installed Japanese Kibo module today at 5:05 p.m., floated inside and literally bounced off the walls, enjoying a chance for some impromptu zero gravity acrobatics in the roomy new addition.

Floating in the middle of the brightly lighted module, Japanese astronaut Akihiko Hoshide held up a sign written in Japanese that, roughly translated, said "aerospace experiments - astronauts wanted."

Measuring 37 feet long and 14 feet wide, Kibo - "Hope" in Japanese - is so large it had to be launched with only a handful of experiment and control system racks in place. As such, the module was virtually empty when the crew floated inside, giving the astronauts and cosmonauts more than enough room to bounce and tumble about.

"This is a great moment for the Japanese folks," Hoshide said before floating inside. "We have the JPM (Japanese pressurized module), the Kibo module, installed yesterday. And now we have the hatch to be opened. I just want to thank all of the Japanese folks that have been working very, very hard. I know it's been like 20-plus years to get this module up in space. It's a beautiful module. We have a new 'hope' on the space station.

"It looks pretty empty because we don't have a lot of racks inside (yet)," he added before opening the main hatch. "But one engineer said down on Earth 'it looks really empty, but it's full of dreams.' And I really think that's what it is."

After addressing flight controllers and engineers at the Tsukuba Space Center in Japanese, a flight director praised the astronauts for reaching "this historical moment. Welcome to JEM! Enjoy your new module!"

"Thank you very much, Tsukuba," Hoshide replied. "This is an international program and with the help of the ground and the crew members up here, we're all a team and we couldn't have done this without everyone's help. So thank you very much."

He then unfurled a large, dark blue banner with "Kibo" written across it in large white letters.

"The Kibo module is open!" Hoshide exclaimed.

Kibo can accommodate 23 experiment and equipment racks, but it was launched with just four in place to keep the weight down to 16 tons. Another eight racks were launched in a smaller Japanese logistics module that was temporarily mounted atop the station's Harmony module in March.

The logistics module will be removed from Harmony and bolted to Kibo Friday. Equipment transfers will begin right away.

Additional coverage for subscribers:
VIDEO: KIBO SCIENCE LAB ATTACHED TO THE SPACE STATION PLAY
VIDEO: KIBO MODULE UNBERTHED FROM SHUTTLE PAYLOAD BAY PLAY
VIDEO: CLOSEUP INSPECTION OF STATION'S SOLAR ROTARY JOINT PLAY
VIDEO: FOSSUM UNBOLTS LOCKS ON KIBO'S WINDOW COVERINGS PLAY
VIDEO: SPACEWALKERS REMOVE COVERS ON KIBO'S PORT PLAY
VIDEO: SHUTTLE POWER UMBILICALS UNHOOKED FROM KIBO PLAY
VIDEO: SHUTTLE INSPECTION BOOM RETRIEVED FROM THE STATION PLAY
VIDEO: SPACEWALKER RON GARAN REMOVES COVER ON BOOM PLAY
VIDEO: SPACEWALKER MIKE FOSSUM FREES ARM'S ELBOW CAMERA PLAY
VIDEO: ANIMATION OF KIBO MODULE INSTALLATION PLAY
VIDEO: ANIMATION OF INSPECTION BOOM RETRIEVAL PLAY
VIDEO: NARRATED PREVIEW OF SPACEWALK NO. 1 PLAY
VIDEO: TUESDAY'S FLIGHT DIRECTOR INTERVIEW PLAY

VIDEO: THE FLIGHT DAY 3 HIGHLIGHTS MOVIE PLAY
VIDEO: CREW'S REMARKABLE CAMCORDER FOOTAGE FROM MONDAY PLAY
VIDEO: MONDAY'S MISSION STATUS BRIEFING PLAY
VIDEO: SHUTTLE CREW WELCOMED INTO STATION PLAY
VIDEO: DISCOVERY DOCKS TO SPACE STATION PLAY
VIDEO: SHUTTLE PERFORMS RENDEZVOUS BACKFLIP PLAY

VIDEO: THE FLIGHT DAY 2 HIGHLIGHTS MOVIE PLAY
VIDEO: CREW'S CAMCORDER FOOTAGE FROM FLIGHT DAY 2 PLAY
VIDEO: SUNDAY'S MISSION STATUS BRIEFING PLAY

VIDEO: THE FLIGHT DAY 1 HIGHLIGHTS MOVIE PLAY
VIDEO: EXTERNAL TANK SEEN AFTER SEPARATION PLAY
VIDEO: LAUNCH REPLAY: VAB ROOF PLAY
VIDEO: LAUNCH REPLAY: CAMERA CS-1 PLAY
VIDEO: LAUNCH REPLAY: CAMERA CS-2 PLAY
VIDEO: LAUNCH REPLAY: CAMERA CS-6 PLAY
VIDEO: LAUNCH REPLAY: FRONT CAMERA PLAY
VIDEO: LAUNCH REPLAY: BEACH TRACKER PLAY
VIDEO: LAUNCH REPLAY: PAD PERIMETER PLAY
VIDEO: LAUNCH REPLAY: UCS-12 TRACKER PLAY
VIDEO: LAUNCH REPLAY: UCS-23 TRACKER PLAY
VIDEO: LAUNCH REPLAY: PLAYALINDA BEACH PLAY
VIDEO: LAUNCH REPLAY: PATRICK AIR FORCE BASE PLAY
VIDEO: LAUNCH REPLAY: PRESS SITE PLAY
VIDEO: LAUNCH REPLAY: WEST TOWER PLAY
VIDEO: LAUNCH REPLAY: CAMERA 009 PLAY
VIDEO: LAUNCH REPLAY: CAMERA 041 PLAY
VIDEO: LAUNCH REPLAY: CAMERA 049 PLAY
VIDEO: LAUNCH REPLAY: CAMERA 050 PLAY
VIDEO: LAUNCH REPLAY: CAMERA 051 PLAY
VIDEO: LAUNCH REPLAY: CAMERA 054 PLAY
VIDEO: LAUNCH REPLAY: CAMERA 060 PLAY
VIDEO: LAUNCH REPLAY: CAMERA 061 PLAY
VIDEO: LAUNCH REPLAY: CAMERA 063 PLAY
VIDEO: LAUNCH REPLAY: CAMERA 070 PLAY
VIDEO: LAUNCH REPLAY: CAMERA 071 PLAY

VIDEO: LIFTOFF OF DISCOVERY WITH KIBO LAB! PLAY
VIDEO: ONBOARD CAMERA FOOTAGE OF TANK FOAM FALLING PLAY
VIDEO: INSIDE MISSION CONTROL DURING LAUNCH PLAY
VIDEO: POST-LAUNCH NEWS CONFERENCE PLAY

VIDEO: FINAL PRE-LAUNCH POLLS GIVE "GO" FOR LIFTOFF PLAY
VIDEO: ASTRONAUTS ARRIVE AT LAUNCH PAD 39A PLAY
VIDEO: CREW DEPARTS QUARTERS FOR LAUNCH PAD PLAY
VIDEO: ASTRONAUTS DON SPACESUITS FOR LAUNCH PLAY
VIDEO: NARRATED RECAP OF KIBO LAB'S PRE-FLIGHT CAMPAIGN PLAY
VIDEO: NARRATED RECAP OF DISCOVERY'S PRE-FLIGHT CAMPAIGN PLAY
VIDEO: LAUNCH PAD GANTRY RETRACTED FRIDAY NIGHT PLAY
VIDEO: TIME-LAPSE OF GANTRY ROLLBACK PLAY
VIDEO: FRIDAY'S COUNTDOWN STATUS BRIEFING PLAY
VIDEO: PRE-LAUNCH NEWS CONFERENCE PLAY
VIDEO: BRIEFING ON KIBO LABORATORY FACILITY PLAY
VIDEO: ASTRONAUTS ARRIVE AT THE CAPE FOR LAUNCH PLAY
VIDEO: WEDNESDAY'S COUNTDOWN AND WEATHER BRIEFING PLAY
VIDEO: NARRATED MISSION PREVIEW MOVIE PLAY

VIDEO: NEWS BRIEFING FOLLOWING FLIGHT READINESS REVIEW PLAY

VIDEO: INTERVIEW WITH COMMANDER MARK KELLY PLAY
VIDEO: INTERVIEW WITH PILOT KEN HAM PLAY
VIDEO: INTERVIEW WITH MS1 KAREN NYBERG PLAY
VIDEO: INTERVIEW WITH MS2 RON GARAN PLAY
VIDEO: INTERVIEW WITH MS3 MIKE FOSSUM PLAY
VIDEO: INTERVIEW WITH MS4 AKIHIKO HOSHIDE PLAY

VIDEO: ASTRONAUTS PRACTICE EVACUATION OF SHUTTLE PLAY
VIDEO: CREW BOARDS DISCOVERY FOR PRACTICE COUNTDOWN PLAY
VIDEO: TRAINING SESSIONS AT LAUNCH PAD AND BUNKER PLAY
VIDEO: CREW NEWS CONFERENCE AT LAUNCH PAD 39A PLAY
VIDEO: ASTRONAUTS ARRIVE FOR PRACTICE COUNTDOWN PLAY

VIDEO: TIME-LAPSE OF GANTRY ENCLOSING DISCOVERY PLAY
VIDEO: PAD'S ORBITER ACCESS ARM SWUNG INTO POSITION PLAY
VIDEO: TIME-LAPSE OF CRAWLER RETREATING AFTER ROLLOUT PLAY
VIDEO: SHUTTLE DISCOVERY ROLLED TO PAD 39A PLAY

VIDEO: SHUTTLE AND STATION PROGRAM BRIEFING PLAY
VIDEO: STS-124 MISSION OVERVIEW PART 1 | PART 2
VIDEO: PREVIEW BRIEFING ON MISSION'S SPACEWALKS PLAY
VIDEO: THE ASTRONAUTS' PRE-FLIGHT NEWS BRIEFING PLAY

VIDEO: KIBO LABORATORY TRAVELS TO THE LAUNCH PAD PLAY
VIDEO: TRANSPORT CANISTER WITH KIBO ROTATED UPRIGHT PLAY
VIDEO: CRANE PLACES KIBO MODULE INTO TRANSPORT CANISTER PLAY

VIDEO: DISCOVERY HOISTED FOR ATTACHMENT TO FUEL TANK PLAY
VIDEO: THE SHUTTLE MOVES TO THE VEHICLE ASSEMBLY BUILDING PLAY
MORE: STS-124 VIDEO COVERAGE
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