The word 'planet' is correct and usable in written English
You can use it when referring to a celestial body in the solar system or in an astronomical context. Example: The eight planets in the solar system orbit around the sun.
He added that he was "pretty much in solidarity with most people on the planet" in opposing war in Iraq.
We are making the biggest investment in roads since the 1970s and the biggest in rail since Victorian times, connecting 40,000 premises to superfast broadband every week, and starting an energy revolution with the first new nuclear plant in a generation, the world's first green investment bank and the largest production of offshore wind on the planet.
Lehmann, who died aged 104 in 1993, studied earthquakes to find that the Earth had both an inner and outer core, a revelation which redefined how the planet was studied.
I'm as happy as the next person to welcome new life (on to our wildly over-populated planet) – hurray for Paul McCartney and David Jason at 61, Pavarotti, 68 and George Lucas doing it at 69 – but my heart goes out to those children.
This final stage is nothing less than an audit of planet Earth.
We stand together, carried along by the same planet, the crew of a single ship.
Though devastating for the dinosaurs, the asteroid strike cleared the way for other animals to gain ground and thrive on the planet.
He's also the third best boxer on the planet, who will face the planet's best boxer this weekend in the biggest sporting event of the year.
They found a strong relationship between the outgoing long wavelength radiation (infrared energy) and temperature; however, this relationship varies substantially across the planet.
By owning shares in these firms, the Gates and Wellcome foundations are profiting from activity that's destroying the planet.
This is, after all, in the interests of the entire planet.
