EarthSky

Top 10 tips for meteor-watchers

How to watch a meteor shower. Tips for beginners.

A graceful ripple of dust in space.

What is interstellar space?

You might be surprised to learn that interstellar space isn’t just vacuum. It’s full of gases, elements, and dust – very thinly spread, to be sure – but the building blocks of stars and planets.

What’s the birthstone for October?

If you were born in October, your birth month has 2 birthstones: opal and tourmaline.

A star called Mira the Wonderful

Mira, in Cetus the Whale, varies in brightness over about 11 months. In late September 2020, it might be near its peak brightness, easily bright enough to be viewed with the eye alone.

Star map of Cassiopeia the Queen.

Close-up on Cassiopeia the Queen

The constellation Cassiopeia the Queen has the distinct shape of a W or M. Find her in the north-northeast sky on September and October evenings.

Comet in the sky above a lake, also reflecting in the lake.

What are comets?

Comets are loosely packed balls of ice and dust orbiting our sun, that sometimes become visible in Earth’s skies. A comet’s tail may stretch across millions of miles of space.

Illustration of Perseverance rover in space on Seotember 12, 2020.

Follow the Perseverance rover in real time on its way to Mars

Keep track of where NASA’s Mars 2020 Perseverance is on its journey through space toward its February 18, 2021, landing on Mars. This web app shows you where spacecraft is right now.

Various colored spheres with white text annotations on black background.

What are brown dwarfs?

A brown dwarf is more massive than a planet, but less massive than a star. Exactly how much more and less?

Sun halo with birds

Scientists call them 22-degree halos, because the shining ring around the sun (or moon) has a radius of approximately 22 degrees.

5 myths about lightning debunked

NOAA debunks some popular myths about lightning.