Without the Earth we would have no place to travel. Or be here for that matter. Today is Earth Day, a day on which we celebrate this little blue marble in the vast ocean of black space that we call our home. Humanity has carved up the Earth via political boundaries into a puzzle of diverse nation states that throughout history have been good at one thing: finding ways to divide themselves disagree and wage war. Non state-based human-made ideologies further divide us. While the post-cold war aspiration was that the twenty-first century would be one of peace, it hasn’t quite worked out that way yet – at least for the first decade. The Earth didn’t ask for any of this. So please, I implore all 7+ billion of you, at least be peaceful for one day and give the Earth a rest. After all, it is pretty old.
The Earth formed approximately 4.54 billion years ago by accretion from the solar nebula, and life appeared on its surface within one billion years. Earth’s biosphere has significantly altered the atmosphere and other abiotic conditions on the planet, enabling the proliferation of aerobic organisms as well as the formation of the ozone layer which, together with Earth’s magnetic field, blocks harmful solar radiation, permitting life on land. The physical properties of the Earth, as well as its geological history and orbit, have allowed life to persist. The planet is expected to continue supporting life for another 500 million to 2.3 billion years. Humans do have some time, but we had better start thinking about terraforming Mars.
The Earth orbits the Sun once every 366.26 times it rotates about its own axis, which is equal to 365.26 solar days. The Earth’s axis of rotation is tilted 23.4° away from the perpendicular of its orbital plane. Earth’s only known natural satellite, the Moon, which began orbiting it about 4.53 billion years ago, provides ocean tides, stabilizes the axial tilt, and gradually slows the planet’s rotation.
Including humans, it is estimated that the diversity of living organisms on Earth could number thirty-five million species or more. This is quite an amazing place.
So, today we celebrate the Earth. Happy Earth Day! Tag Der Erde, Den Na Zemyata, Sretan Zemlja Dan, Šťasný den Země , Head Maa Päeva, Bonne Journee De La Terre, Glücklicher Masse Tag, Boldog Föld Napját, Felice Giornata della Terra, 幸せなアースデ アースデイ, Zadowolony Ziemia Dzień, Dia Da Terra, Счастливый Земля День, Feliz Día de la Terra, Mutlu Yerküre Gün, 행복한 지구의 날 되세요, Srećan Zemlja Danje Svetlo, Glad Jord Dag, يوم الأرض.