Space exploration is a challenge to human beings. That's why several nations try hard to carry out space exploration continuously.

太空探索对我们人类来说是个挑战，这也是为什么许多国家不断进行探索的原因之一。

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Space exploration is a challenge to human beings. That 's why several nations try hard to carry out space exploration continuously.

太空探索对我们人类来说是个挑战，这也是为什么许多国家不断进行探索的原因之一。

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The rocket is being designed to carry out the agency's future human space exploration goals, such as sending astronauts to visit an asteroid or Mars.

MSN: Giant deep-space rocket passes key test - Technology & science - Space - Space.com | NBC News