1. Hubble Space telescope was launched into the space with the help of space shuttle Discovery.
2. Occurrence of ozone is most relevant for the presence of life on Mars.
3. Among stars Polaris Alpha Centauri Sun and Sirusis nearest to the earth is Sun.
4. Although Venus is the planet that comes closest to Earth as it sweeps by on its orbit.
5. Mercury stays the closest to Earth the longest.

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