Venus Transit

Handout image courtesy of NASA shows the planet Venus at the start of its transit of the Sun, June 5, 2012. One of the rarest astronomical events occurs on Tuesday and Wednesday when Venus passes directly between the sun and Earth, a transit that won't occur again until 2117. REUTERS/NASA/AIA/Solar Dynamics Observatory/Handout

The planet Venus makes its transit across the Sun as seen from Kathmandu June 6, 2012. Venus made a slow transit across the face of the sun on Tuesday, the last such passing that will be visible from Earth for 105 years. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY)

1. The planet Venus makes a transit as a person watches the sun set over the Great Salt Lake outside Salt Lake City, Utah, June 5, 2012. The planet Venus made a slow transit across the face of the sun on Tuesday, the last such passing that will be visible from Earth for 105 years. REUTERS/Jim Urquhart (UNITED STATES - Tags: SCIENCE TECHNOLOGY ENVIRONMENT)

2. Venus is silhouetted as it crosses in front of the sun as it sets behind the Kansas City, Mo. skyline Tuesday, June 5, 2012. From the U.S. to South Korea, people around the world turned their attention to the daytime sky on Tuesday and early Wednesday in Asia to make sure they caught the once-in-a-lifetime sight of the transit of Venus, which won't be seen for another 105 years. (AP Photo/Charlie Riedel)

3. Members of a family use solar viewers to watch Venus passing between the Sun and the Earth in Cuernavaca June 5, 2012. Venus made a slow transit across the face of the sun on Tuesday, the last such passing that will be visible from Earth for 105 years. REUTERS/Margarito Perez Retana (MEXICO - Tags: ENVIRONMENT SCIENCE TECHNOLOGY)

4. The planet Venus can be seen on its transit of the Sun, from New Delhi June 6, 2012. Venus last made a visible pass in front of the sun in 2004 but will not make another visible transit until 2117. REUTERS/Adnan Abidi (INDIA - Tags: SCIENCE TECHNOLOGY ENVIRONMENT)

5. Clouds partially obscure the sun during the transit of Venus, seen from Maryland in the US, on June 5. The transit began shortly after 2200 GMT Tuesday in parts of North America, Central America and the northern part of South America, and was visible, with magnification, as a small black dot on the solar surface. (AFP Photo/Jewel Samad)

6. Venus begins to pass in front of the sun, as visible from New York, Tuesday, June 5, 2012. From the U.S. to South Korea, people around the world turned their attention to the daytime sky on Tuesday and early Wednesday in Asia to make sure they caught the once-in-a-lifetime sight of the transit of Venus, which won't be seen for another 150 years. (AP Photo/Seth Wenig)

7. Handout image courtesy of NASA shows the planet Venus at the start of its transit of the Sun, June 5, 2012. One of the rarest astronomical events occurs on Tuesday and Wednesday when Venus passes directly between the sun and Earth, a transit that won't occur again until 2117. REUTERS/NASA/AIA/Solar Dynamics Observatory/Handout

8. Handout image courtesy of NASA shows the planet Venus transiting the Sun, June 5, 2012. One of the rarest astronomical events occurs on Tuesday and Wednesday when Venus passes directly between the sun and Earth, a transit that won't occur again until 2117. REUTERS/NASA/AIA/Solar Dynamics Observatory/Handout (UNITED STATES - Tags: ENVIRONMENT SCIENCE TECHNOLOGY) FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS ...more 

9. Handout image courtesy of NASA shows the planet Venus at the start of its transit of the Sun, June 5, 2012. One of the rarest astronomical events occurs on Tuesday and Wednesday when Venus passes directly between the sun and Earth, a transit that won't occur again until 2117. REUTERS/NASA/AIA/Solar Dynamics Observatory/Handout

10. The "black drop" effect is seen as Venus (top) begins to cross the sun's face during the transit of Venus as seen from the west side of Manhattan in New York. The optical illusion makes Venus appear to be "stuck" to the edge of the sun at the beginning and end of the transit. (AFP Photo/Stan Honda)

11. Handout image courtesy of NASA shows the planet Venus at the start of its transit of the Sun, June 5, 2012. One of the rarest astronomical events occurs on Tuesday and Wednesday when Venus passes directly between the sun and Earth, a transit that won't occur again until 2117. REUTERS/NASA/AIA/Solar Dynamics Observatory/Handout

12. A combination picture shows the planet Venus as it transits across the face of the sun as seen from the Greenwich Observatory on June 8, 2004 in London. The rare astronomical event last occurred in 1882, while the next transit is due in 2012. (Photo by Ian Waldie/Getty Images)

13. Davinia Troughton (L) and Joshua Howes, both from New York, wear special goggles to observe the Transit of Venus from the High Line park in New York City. (AFP Photo/Andrew Burton)

14. Eight-year-old Alex Olling watches Venus crossing the sun's face in the US state of Maryland on June 5. "Everyone's having a great time," NASA scientist Richard Vondrak said from the Goddard Space Flight Center in Maryland, where 600 people gathered to observe the fiery planet of love

15. South Korean middle school students using solar viewers watch Venus passing between the Sun and the Earth at the Gwacheon National Science Museum in Gwacheon, south of Seoul, June 6, 2012. One of the rarest astronomical events occurs on Wednesday when Venus passes directly between the sun and Earth, a transit that won't occur again until 2117. REUTERS/Kim Hong-Ji (SOUTH KOREA - Tags: ENVIRONMENT)

16. Indian children use cardboard eclipse glasses as they prepare to watch the transit of Venus in Allahabad, India, Tuesday, June 5, 2012. Stargazers around the world are setting up special telescopes and passing out cardboard eclipse glasses to view the once-in-a-lifetime celestial cameo of Venus passing in front of the sun. Venus is Earth's second-closest neighboring planet. (AP Photo/Rajesh Kumar Singh)

17. South Korean primary school students wearing masks with solar viewers watch Venus passing between the Sun and the Earth at the Gwacheon National Science Museum in Gwacheon, south of Seoul, June 6, 2012. One of the rarest astronomical events occurs on Wednesday when Venus passes directly between the sun and Earth, a transit that won't occur again until 2117. REUTERS/Kim Hong-Ji (SOUTH KOREA - Tags: ENVIRONMENT TPX IMAGES OF THE DAY)

18. FILE - In this June 8, 2004 file photo, amateur astronomer Jody McGowen looks through a telescope to watch the transit of Venus from Sydney's Observatory Hill. Venus will again cross the face of the sun on Tuesday June 5, 2012, a sight that will be visible from parts of Earth. This is the last transit for more than 100 years. (AP Photo/Mark Baker, File)

19. A bird flies during a transit of Venus, lower left, observed in Wakkanai, a town at the northernmost tip of Japan on Tuesday, June 8, 2004. A transit takes place when Venus passes between the Earth and the Sun. (AP Photo / Kyodo News)