Experts suggest Earth's'sister' planet, Venus, should be visited before Mars.

There are scientists who argue that a crewed expedition to Venus should be sent before one to Mars.

Izenberg proposed a flyby of Venus, which is far closer to Earth than Mars, during the International Astronautical Congress in Paris.

According to Izenberg, quoted in The Guardian, Venus is given a negative reputation because of its challenging surface environment.

We're arguing that Venus should be included as a destination along that route "Izenberg reportedly said so in the article.

Since its size and composition are so similar to Earth's, Venus has earned the nickname "Earth's twin" from NASA.

He said that a crewed Venus flyby on the way to Mars in 2020 may be a "two planets for the price of one-plus".

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