Flags of Our Nation (Washington, DC) - 42 cent stamp - First Day of Issue Cover

Flags of Our Nation (Washington, DC) - 42 cent stamp - First Day of Issue Cover - September 2, 2008 - Washington, DC

Flags of Our Nation (Georgia) - 42 cent stamp - First Day of Issue Cover

Flags of Our Nation (Georgia) - 42 cent stamp - First Day of Issue Cover - September 2, 2008 -Washington, DC

Flags of Our Nation (Florida) - 42 cent stamp - First Day of Issue Cover

Flags of Our Nation (Florida) - 42 cent stamp - First Day of Issue Cover - September 2, 2008 -Washington, DC

Flags of Our Nation (Guam) - 42 cent stamp - First Day of Issue Cover

Flags of Our Nation (Guam) - 42 cent stamp - First Day of Issue Cover - September 2, 2008 -Washington, DC

Mariano Rivera - P - New York Yankees

Mariano Rivera, of the New York Yankees, is the last major leaguer who sports The Number on a daily basis. When MLB retired The Number across the league in 1997 players who were at the time wearing The Number were allowed to continue wearing The Number. Rivera is the last left.

Here is he shown warming up before the 2006 MLB All-Star game at PNC Park in Pittsburgh, Pennsylvania.

Orion Nebula (M42 emission nebula)

M42, the great Orion Nebula (M42, NGC 1976) , is about 1,500 light years from Earth and about 30 light years in diameter - it is roughly spherical in shape, composed of gas and dust. The colors seen in long exposure photographic images comes from hydrogen, oxygen and nitrogen ionized by the intense energy emitted by the young, bright stars within the cloud. It is also a big object in the sky, extending to over 1 degree in diameter, thus covering more than four times the area of the Full Moon.

M42 and the other emission nebula in the universe are stellar nurseries, where gas and dust are condensing into new stars. M42 was cataloged by French astronomer Charles Messier in 1769. It was the 42nd object cataloged by Messier, thus the designation "M42".

Visually, M42 can be observed with the naked eye in areas with dark skies - it is seen as a fuzzy, gray blob in the middle of the "sword" hanging below the prominent triple star "belt" in the constellation Orion. It can be seen with binoculars even in moderately light-polluted skies, and small amateur telescopes make it out easily from most earthly locations. But the human eye lacks sensitivity to low levels of color, so even with the largest telescopes under the darkest skies the nebula appears to be grey.

Jackie Robinson Day 2009 - Vladimir Guerrero - Los Angeles Angels

Los Angeles Angels Vladimir Guerrero watches the path of a foul ball against the Seattle Mariners Wednesday, April 15, 2009, during a baseball game in Seattle, Washington.

(AP Photo/Elaine Thompson)

Jackie Robinson Day 2009 - Adam LaRoche - Pittsburgh Pirates

Pittsburgh Pirates' Adam LaRoche, left, rounds the bases in front of Houston Astros third baseman Geoff Blum after hitting a solo homer in the bottom of the ninth inning in Pittsburgh, Pennsylvania, Wednesday, April 15, 2009. It was the only Pirate run scored in the team's 4-1 loss to the Astros.

(AP Photo/Keith Srakocic)

Jackie Robinson Day 2009 - Chris Duncan - St. Louis Cardinals

St. Louis Cardinals' Chris Duncan, right, gets a high-five from teammate Joe Thurston after scoring against the Arizona Diamondbacks in the third inning of a baseball game Wednesday, April 15, 2009, in Phoenix, Arizona.

(AP Photo/Ross D. Franklin)

Jackie Robinson Day 2009 - Seth Smith - Colorodo Rockies

Colorado Rockies' Seth Smith watches his solo home run during the third inning of a baseball game against the Chicago Cubs at Wrigley Field in Chicago, Illinois on Wednesday, April 15, 2009.

Jackie Robinson Day 2009 - New York Yankees

Photo by Chris O'Meara/AP

Members of the New York Yankees, including Mark Teixeira, third from right, wear No. 42 in honor of Jackie Robinson during the National Anthem before an MLB game against the Tampa Bay Rays Wednesday April 15, 2009 in St. Petersburg, Florida. Players, coaches and umpires wore No. 42 on Wednesday to honor Jackie Robinson on the 62nd anniversary of the day he broke major league baseball's color barrier.

Opening Day 2009 in Washington, DC

Flags of Our Nation (Illinois) - 42 cent stamp - First Day of Issue Cover

Flags of Our Nation (Illinois) - 42 cent stamp - First Day of Issue Cover - September 2, 2008 -Washington, DC

Flags of Our Nation (Idaho) - 42 cent stamp - First Day of Issue Cover

Flags of Our Nation (Idaho) - 42 cent stamp - First Day of Issue Cover - September 2, 2008 -Washington, DC

Flags of Our Nation (Hawaii) - 42 cent stamp - First Day of Issue Cover

Flags of Our Nation (Hawaii) - 42 cent stamp - First Day of Issue Cover - September 2, 2008 -Washington, DC