The Big Bang Theory has received the highest rating of 1.87 million viewers from Australia for its 21st episode, "The Hawking Excitation," according to TV Tonight. Can the season finale top this?

The outlook is very positive based on viewership reported in the United States and Canada.

For those who have missed the season finale of The Big Bang Theory, here are the Top 10 highlights of the hilarious Season 4 Episode 24, "The Countdown Reflection."

(Warning: Spoilers ahead.)

10. Howard Wolowitz (Simon Helberg) joins NASA astronauts onboard a spacecraft. He just showed off everyone else by being the first one among their group to go into space. Howard is seen in a spacesuit with Mike Massimino, a real NASA astronaut. It is Mike's second cameo appearance on the sitcom that has helped promote the tag line, "Smart is the new sexy."

09. Amy Farrah Fowler (Mayim Bialik) throws a fit after realizing that she may not have her "dream wedding." It took a while, but she has come to endear herself to many fans of the show.

08. The whole gang goes to the city hall for Howard's and Bernadette's wedding. But the wedding does not push through.

07. Sheldon Cooper (Jim Parsons) makes a reference to the Green Lantern movie, saying Leonard was 114 minutes of wrong in saying, "It's gonna be fine."

06. Rajesh Koothrappali (Kunal Nayyar) takes charge as event planner for Howard's and Bernadette's wedding. He throws in Google Earth into the grand plan.

05. Leonard Hofstadter (Johnny Galecki) and Penny (Kaley Cuoco) get into endless bickering over his terribly awkward marriage-proposal-in-bed. Sheldon segues into the fight and quips to Penny, "Do you need aloe vera? Because you just got burned!"

04. TBBT's male leads look all dapper in tuxedos. They have worn many costumes and comic hero shirts in the show. Now it is very cute to see everyone suit up for a very formal and intimate occasion.

03. Bernadette's father walks her down the 'aisle,' and says, "Here you go." It is a scene than is better watched than narrated. Props to the show's writers for making sure that the first TBBT wedding would show more leaning to comedy than drama.

02. Bernadette and Howard exchange vows. The words are "short and sweet," but they ring true and they tug at everyone's heartstrings. It is Howard's wedding, after all. Yet it's all too real.

01. Howard is launched into space as the rest of the gang tries to contain their hearts. The last few minutes of the season finale more than made up for the mess that the producers delivered last year.

Click 'Start' to see some of the TBBT-related postings on Tumblr.

NASA Australia