NASA @NASA
We know you love Earth, but how much do you know about it? đŸ¤” When the solar system settled into its current layout about 4.5 billion years ago, gravity pulled in swirling gas & dust to form Earth. Learn more about our home planet for #EarthDay: https://t.co/GSuj5jyDMm https://t.co/zeA29cbrZH — PolitiTweet.org