The Galileo Galilei planetarium is seen lit in the colours of Brazil's flag in homage to 2016 Rio Olympics in Buenos Aires, Argentina, August 4, 2016. REUTERS/Enrique Marcarian 

The Galileo Galilei planetarium is lit in homage to 2016 Rio Olympics in Buenos Aires, Argentina, August 4, 2016. REUTERS/Enrique Marcarian 

The Galileo Galilei planetarium is lit in homage to 2016 Rio Olympics in Buenos Aires, Argentina, August 4, 2016. REUTERS/Enrique Marcarian 

The Galileo Galilei planetarium is seen lit in the colours of Brazil's flag in celebration of the 100 days before the 2016 Rio Olympics in Buenos Aires, Argentina, April 27, 2016. REUTERS/Marcos Brindicci 

One of over 500 ancient books, with original editions of Galileo Galilei and Nicolaus Copernicus among them, is presented by German police during a news conference at the Munich Federal state police headquarters, February 13, 2015. The books, mostly from the 16th and 17th centuries, were seized at a Munich auction house in May 2012 and will be returned to Italy, where they were stolen from libraries in 2011-2012.
REUTERS/Michael Dalder (GERMANY - Tags: CRIME LAW ENTERTAINMENT SOCIETY)

One of over 500 ancient books, with original editions of Galileo Galilei and Nicolaus Copernicus among them, is presented by German police during a news conference at the Munich Federal state police headquarters, February 13, 2015. The books, mostly from the 16th and 17th centuries, were seized at a Munich auction house in May 2012 and will be returned to Italy, where they were stolen from libraries in 2011-2012.
REUTERS/Michael Dalder (GERMANY - Tags: CRIME LAW ENTERTAINMENT SOCIETY)

Some of over 500 ancient books, with original editions of Galileo Galilei and Nicolaus Copernicus among them, is presented by German police during a news conference at the Munich Federal state police headquarters, February 13, 2015. The books, mostly from the 16th and 17th centuries, were seized at a Munich auction house in May 2012 and will be returned to Italy, where they were stolen from libraries in 2011-2012.
REUTERS/Michael Dalder (GERMANY - Tags: CRIME LAW ENTERTAINMENT SOCIETY)

One of over 500 ancient books, with original editions of Galileo Galilei and Nicolaus Copernicus among them, is presented by German police during a news conference at the Munich Federal state police headquarters, February 13, 2015. The books, mostly from the 16th and 17th centuries, were seized at a Munich auction house in May 2012 and will be returned to Italy, where they were stolen from libraries in 2011-2012.
REUTERS/Michael Dalder (GERMANY - Tags: CRIME LAW ENTERTAINMENT SOCIETY TPX IMAGES OF THE DAY)

One of over 500 ancient books, with original editions of Galileo Galilei and Nicolaus Copernicus among them, is presented by German police during a news conference at the Munich Federal state police headquarters, February 13, 2015. The books, mostly from the 16th and 17th centuries, were seized at a Munich auction house in May 2012 and will be returned to Italy, where they were stolen from libraries in 2011-2012.
REUTERS/Michael Dalder (GERMANY - Tags: CRIME LAW ENTERTAINMENT SOCIETY)

A German police officer presents some of over 500 ancient books, with original editions of Galileo Galilei and Nicolaus Copernicus among them, during a news conference at the Munich Federal state police headquarters, February 13, 2015. The books, mostly from the 16th and 17th centuries, were seized at a Munich auction house in May 2012 and will be returned to Italy, where they were stolen from libraries in 2011-2012.
REUTERS/Michael Dalder (GERMANY - Tags: CRIME LAW ENTERTAINMENT SOCIETY)

A man holds up a sign during a demonstration outside the Galileo Galilei planetarium in Buenos Aires, September 21, 2014. The demonstration was part of the People's Climate March, held in cities around the world such as Rio de Janeiro and New York ahead of Tuesday's United Nations-hosted summit in New York to discuss reducing carbon emissions that threaten the environment. REUTERS/Marcos Brindicci (ARGENTINA - Tags: SOCIETY ENVIRONMENT CIVIL UNREST) 

A woman holds up a sign during a demonstration outside the Galileo Galilei planetarium in Buenos Aires, September 21, 2014. The demonstration was part of the People's Climate March, held in cities around the world such as Rio de Janeiro and New York ahead of Tuesday's United Nations-hosted summit in New York to discuss reducing carbon emissions that threaten the environment. REUTERS/Marcos Brindicci (ARGENTINA - Tags: SOCIETY ENVIRONMENT CIVIL UNREST) 

People gather during a demonstration outside the Galileo Galilei planetarium in Buenos Aires September 21, 2014. The demonstration was part of the People's Climate March, held in cities around the world such as Rio de Janeiro and New York ahead of Tuesday's United Nations-hosted summit in New York to discuss reducing carbon emissions that threaten the environment. REUTERS/Marcos Brindicci (ARGENTINA - Tags: ENVIRONMENT CIVIL UNREST) 

A man holds up a sign that reads "Argentina for Climate" during a demonstration outside the Galileo Galilei planetarium in Buenos Aires, September 21, 2014. The demonstration was part of the People's Climate March, held in cities around the world such as Rio de Janeiro and New York ahead of Tuesday's United Nations-hosted summit in New York to discuss reducing carbon emissions that threaten the environment. REUTERS/Marcos Brindicci (ARGENTINA - Tags: ENVIRONMENT CIVIL UNREST) 

A man holds up a sign during a demonstration outside the Galileo Galilei planetarium in Buenos Aires September 21, 2014. The demonstration was part of the People's Climate March, held in cities around the world such as Rio de Janeiro and New York ahead of Tuesday's United Nations-hosted summit in New York to discuss reducing carbon emissions that threaten the environment. REUTERS/Marcos Brindicci (ARGENTINA - Tags: ENVIRONMENT CIVIL UNREST) 

A woman writes "People's Climate March - Argentina" on a sign during a demonstration outside the Galileo Galilei planetarium in Buenos Aires September 21, 2014. The demonstration was part of the People's Climate March, held in cities around the world such as Rio de Janeiro and New York ahead of Tuesday's United Nations-hosted summit in New York to discuss reducing carbon emissions that threaten the environment. REUTERS/Marcos Brindicci (ARGENTINA - Tags: SOCIETY ENVIRONMENT CIVIL UNREST) 

A woman holds up a sign that reads "Against Climate Change" during a demonstration outside the Galileo Galilei planetarium in Buenos Aires, September 21, 2014. The demonstration was part of the People's Climate March, held in cities around the world such as Rio de Janeiro and New York ahead of Tuesday's United Nations-hosted summit in New York to discuss reducing carbon emissions that threaten the environment. REUTERS/Marcos Brindicci (ARGENTINA - Tags: SOCIETY ENVIRONMENT CIVIL UNREST) 

A man (center row, 3rd R) looks at his mobile phone as people hold candles outside the Galileo Galilei planetarium to observe Earth Hour in Buenos Aires March 29, 2014. Lights go off around the world at 8.30pm local time in a show of support for renewable energy during Earth Hour, an event organised since 2007 to promote a sustainable future for the planet. REUTERS/Marcos Brindicci (ARGENTINA - Tags: ENVIRONMENT ENERGY) 

A couple takes a 'selfie' while holding candles as they gather outside the Galileo Galilei planetarium to observe Earth Hour in Buenos Aires March 29, 2014. Lights go off around the world at 8.30pm local time in a show of support for renewable energy during Earth Hour, an event organised since 2007 to promote a sustainable future for the planet. REUTERS/Marcos Brindicci (ARGENTINA - Tags: ENVIRONMENT ENERGY SOCIETY) 

People, dressed as movie characters Freddy Krueger (L) and Jason from "Friday the 13th", pose for a picture outside the Galileo Galilei planetarium during Earth Hour in Buenos Aires March 29, 2014. Lights go off around the world at 8.30pm local time in a show of support for renewable energy during Earth Hour, an event organised since 2007 to promote a sustainable future for the planet. REUTERS/Marcos Brindicci (ARGENTINA - Tags: ENVIRONMENT ENERGY SOCIETY) 

People hold candles as they gather outside the Galileo Galilei planetarium to observe Earth Hour in Buenos Aires, March 29, 2014. Lights go off around the world at 8.30pm local time in a show of support for renewable energy during Earth Hour, an event organised since 2007 to promote a sustainable future for the planet. REUTERS/Marcos Brindicci (ARGENTINA - Tags: ENVIRONMENT ENERGY SOCIETY) 

A child dressed as Spiderman holds a candle as people gather outside the Galileo Galilei planetarium to observe Earth Hour in Buenos Aires, March 29, 2014. Lights go off around the world at 8.30pm local time in a show of support for renewable energy during Earth Hour, an event organised since 2007 to promote a sustainable future for the planet. REUTERS/Marcos Brindicci (ARGENTINA - Tags: ENVIRONMENT ENERGY SOCIETY) 

People hold candles as they stand next to a pond in front of the Galileo Galilei planetarium during Earth Hour in Buenos Aires March 29, 2014. Lights go off around the world at 8.30pm local time in a show of support for renewable energy during Earth Hour, an event organised since 2007 to promote a sustainable future for the planet. REUTERS/Marcos Brindicci (ARGENTINA - Tags: ENVIRONMENT ENERGY SOCIETY TRAVEL) 

People hold candles as they gather outside the Galileo Galilei planetarium to observe Earth Hour in Buenos Aires March 29, 2014. Lights go off around the world at 8.30pm local time in a show of support for renewable energy during Earth Hour, an event organised since 2007 to promote a sustainable future for the planet. REUTERS/Marcos Brindicci (ARGENTINA - Tags: ENVIRONMENT ENERGY SOCIETY) 

People hold candles as they gather outside the Galileo Galilei planetarium to observe Earth Hour in Buenos Aires March 29, 2014. Lights go off around the world at 8.30pm local time in a show of support for renewable energy during Earth Hour, an event organised since 2007 to promote a sustainable future for the planet. REUTERS/Marcos Brindicci (ARGENTINA - Tags: ENVIRONMENT ENERGY SOCIETY) 

People hold candles as they gather outside the Galileo Galilei planetarium to observe Earth Hour in Buenos Aires March 29, 2014. Lights go off around the world at 8.30pm local time in a show of support for renewable energy during Earth Hour, an event organised since 2007 to promote a sustainable future for the planet. REUTERS/Marcos Brindicci (ARGENTINA - Tags: ENVIRONMENT ENERGY SOCIETY) 

A general view of the Galileo Galilei planetarium after Earth Hour in Buenos Aires March 29, 2014. Lights go off around the world at 8.30pm local time in a show of support for renewable energy during Earth Hour, an event organised since 2007 to promote a sustainable future for the planet. REUTERS/Marcos Brindicci (ARGENTINA - Tags: ENVIRONMENT ENERGY SOCIETY TRAVEL) 

A general view of the Galileo Galilei planetarium during Earth Hour in Buenos Aires March 29, 2014. Lights go off around the world at 8.30pm local time in a show of support for renewable energy during Earth Hour, an event organised since 2007 to promote a sustainable future for the planet. REUTERS/Marcos Brindicci (ARGENTINA - Tags: ENVIRONMENT ENERGY SOCIETY TRAVEL) 

A combination picture shows the Galileo Galilei planetarium during Earth Hour (top) and after Earth Hour in Buenos Aires March 29, 2014. Lights go off around the world at 8.30pm local time in a show of support for renewable energy during Earth Hour, an event organised since 2007 to promote a sustainable future for the planet. REUTERS/Marcos Brindicci (ARGENTINA - Tags: ENVIRONMENT ENERGY TRAVEL SOCIETY) 

The signature of Galileo Galilei is seen on a document displayed during the exhibition "Lux in Arcana, the Vatican secret Archives reveals itself" at the Capitoline Museums in Rome February 29, 2012. REUTERS/Tony Gentile (ITALY - Tags: RELIGION SOCIETY) 

A view of Galileo's handwritten description on his telescope as it is displayed at the Franklin Institute in Philadelphia, Pennsylvania April 1, 2009. The three-foot telescope used by the Italian astronomer Galileo, whose discoveries revolutionized astronomy, is the main attraction at an exhibition at the Franklin Institute. Picture taken April 1, 2009. REUTERS/Tim Shaffer (UNITED STATES SOCIETY SCI TECH) 

The tomb of astronomer Galileo Galilei is seen at the Santa Croce basilica in Florence January 22, 2009. Italian and British scientists want to exhume the body of 16th century astronomer Galileo for DNA tests to determine if his severe vision problems may have affected some of his findings. The scientists told Reuters on Thursday that DNA tests would help answer some unresolved questions about the health of the man known as the father of astronomy, whom the Vatican condemned for teaching that the earth revolves around the sun. REUTERS/Marco Bucco (ITALY) 

The tomb (L) of astronomer Galileo Galilei is seen at the Santa Croce basilica in Florence January 22, 2009. Italian and British scientists want to exhume the body of 16th century astronomer Galileo for DNA tests to determine if his severe vision problems may have affected some of his findings. The scientists told Reuters on Thursday that DNA tests would help answer some unresolved questions about the health of the man known as the father of astronomy, whom the Vatican condemned for teaching that the earth revolves around the sun. REUTERS/Marco Bucco (ITALY) 

An 1851 statue of astronomer Galileo Galilei by sculptor Aristodemo Costoli is seen in the Uffizi art gallery in Florence January 22, 2009. Italian and British scientists want to exhume the body of 16th century astronomer Galileo for DNA tests to determine if his severe vision problems may have affected some of his findings. The scientists told Reuters on Thursday that DNA tests would help answer some unresolved questions about the health of the man known as the father of astronomy, whom the Vatican condemned for teaching that the earth revolves around the sun. EDITORIAL USE ONLY REUTERS/Marco Bucco (ITALY) 

The tomb of astronomer Galileo Galilei is seen at the Santa Croce basilica in Florence January 22, 2009. Italian and British scientists want to exhume the body of 16th century astronomer Galileo for DNA tests to determine if his severe vision problems may have affected some of his findings. The scientists told Reuters on Thursday that DNA tests would help answer some unresolved questions about the health of the man known as the father of astronomy, whom the Vatican condemned for teaching that the earth revolves around the sun. REUTERS/Marco Bucco (ITALY) 

A tourist views the tomb of astronomer Galileo Galilei at the Santa Croce basilica in Florence January 22, 2009. Italian and British scientists want to exhume the body of 16th century astronomer Galileo for DNA tests to determine if his severe vision problems may have affected some of his findings. The scientists told Reuters on Thursday that DNA tests would help answer some unresolved questions about the health of the man known as the father of astronomy, whom the Vatican condemned for teaching that the earth revolves around the sun. REUTERS/Marco Bucco (ITALY) 

A tourist views the 1635 portrait of astronomer Galileo Galilei (centre R) by Dutch painter Justus Sustermans in the Palazzo Pitti art gallery in Florence January 22, 2009. Italian and British scientists want to exhume the body of 16th century astronomer Galileo for DNA tests to determine if his severe vision problems may have affected some of his findings. The scientists told Reuters on Thursday that DNA tests would help answer some unresolved questions about the health of the man known as the father of astronomy, whom the Vatican condemned for teaching that the earth revolves around the sun. REUTERS/Marco Bucco (ITALY) 

People attend the reunion concert of Argentine band Fabulosos Cadillacs outside Galileo Galilei planetarium in a park in Buenos Aires, July 1, 2008. REUTERS/Marcos Brindicci (ARGENTINA) 

Thomas Lecky, department head of books and manuscripts at Christie's, holds a book with sketches of the moon by Galileo Galilei during a preview at Christie's auction house in New York June 13, 2008. REUTERS/Lucas Jackson (UNITED STATES) 

Fireworks explode in the sky behind Argentina's Galileo Galilei planetarium, in Buenos Aires, December 25, 2004. The event was held by the Buenos Aires City Hall as part of Christmas and New Year festivities. REUTERS/Enrique Marcarian EM