Earth

A new Propulsion System Could Levitate Vehicles in the Earth’s Upper Atmosphere

Sometimes it's hard to remember that NASA also does atmospheric research too. While typically thought of as the province of…

7 days ago

Light Pollution is Obscuring the Night Sky. RIP Stargazing

A citizen science initiative called Globe at Night has some sobering news for humanity. Our artificial light is drowning out…

1 week ago

Could Next-Generation Telescopes See That Earth Has Life?

While the Earth absorbs a lot of energy from the Sun, a lot of it is reflected back into space.…

1 week ago

Should Planetary Defence Take Center Stage?

Throughout the Solar System, planets and moons bear the scars of a past fraught with collisions. The Moon, Mercury, and…

4 weeks ago

Earth’s Water is 4.5 Billion Years Old

The origin of Earth's water has been an enduring mystery. There are different hypotheses and theories explaining how the water…

1 month ago

To Fight Climate Change, We Could Block the Sun. A Lightweight Solar Sail Could Make it Feasible

Can we build an enormous umbrella to dim the Sun? Such a feat would be a megaproject on a scale…

2 months ago

Should We Build a Nature Reserve on Mars?

There are 8 billion of us now. The UN says when the population peaks around the year 2100, there'll be…

2 months ago

OK, Artemis. Now You’re Just Showing Off. A Stunning View of the Moon Eclipsing Earth From the Orion Spacecraft

Have you ever seen a lunar eclipse of the Earth from the far side of the Moon? Now we have.…

2 months ago

What’s the Best Mix of Oceans to Land for a Habitable Planet?

Earth is about 29% land and 71% oceans. How significant is that mix for habitability? What does it tell us…

2 months ago

Volcanoes are the worst. They’ve caused extinctions on Earth, and probably killed Venus

Is there anything good about volcanoes? They can be violent, dangerous, and unpredictable. For modern humans, volcanoes are mostly an…

2 months ago