If we were to rewind the clock back 4.5 billion years, our planet would be massively different. And seeing Earth from space, you’d notice a glaring omission: the Moon would not be there.

It would take 120 years to travel to planet K2-18b at the speed of light. Here's how we know what could lie there.

Earth Day started in 1970 when people — including Wisconsin Sen. Gaylord Nelson — brought attention to the impact oil spills, pollution and smog were having on the planet. "Then in January ...

Today is Earth Day: A day to be thankful for our home planet and to take a moment and think about what we can do to take better care of the place so it’ll continue to be a good home for a few ...

For Earth Day, we asked the experts. They shared advice on how to be the best planetary citizen possible. Atlas carried the weight of the heavens. You carry the weight of helping the planet.Credit ...

Keep reading to discover more about Earth Day, why it matters, and how you can contribute to a healthier planet through simple changes and local efforts. Related: 10 devastating signs of climate ...

Now celebrating its 55th anniversary, this year's Earth Day theme, "Our Power, Our Planet," calls for people worldwide to unite behind renewable energy and promote clean electricity by 2030 ...

The theme for Earth Day 2025 is "OUR POWER, OUR PLANET," the Earth Day website says, inviting "everyone around the globe to unite behind renewable energy, and to triple the global generation of ...

Earth Day is a global reminder that protecting our planet takes more than good intentions — it takes lasting action. Marked every year on 22nd April, it brings people together to raise awareness and ...

And what better time to keep our planet happy and healthy than on Earth Day? See when we celebrate the holiday this year, what it's all about and how you can take steps further reducing ...