Life on Mars?

Analyze 'Life on Mars?' lyrics and themes. Understand its meaning!

Fill in the blanks with 1 or 2 words. Ground Control to Major TomGround Control to Major TomTake your protein pills and put your helmet onGround Control to Major TomCommencing countdown, engines onCheck ignition and may God's love be with youThis is Ground Control to Major TomYou've really made the gradeAnd the papers want to know whose shirts you wearNow it's time to leave the capsule if you dareThis is Major Tom to Ground ControlI'm stepping through the doorAnd I'm floating in a most peculiar wayAnd the stars look very different todayFor here am I floating in my tin canFar above the worldPlanet Earth is blueAnd there's nothing I can doThough I'm past one hundred thousand milesI'm feeling very stillAnd I think my spaceship knows which way to goTell my wife I love her very muchShe knowsGround Control to Major TomYour circuit's dead, there's something wrongCan you hear me, Major Tom?Can you hear me, Major Tom?Can you hear me, Major Tom?Can you....Here am I sitting on my tin canFar above the MoonPlanet Earth is blueAnd there's nothing I can do What does he or she mean by “planet Earth is blue”? What does the end of the song suggest? Who may have written the lyrics to this song? Why?