Enjoying EarthSky? Subscribe.

261,435 subscribers and counting ...

More Cassini legacy: Titan’s bonkers atmosphere

Cassini’s legacy will endure. Click for a video about the atmosphere of Saturn’s large moon Titan, which might resemble that of an early Earth.

Another X-flare from the sun

We’re near solar minimum, but the sun has been active! Click here for a video of solar flares so far in September, 2017 and for news for the sun’s most recent X-flare.

X-ray astronomy and planet-hosting stars

X-ray astronomers explored how quickly young stars settle down after blasting the space around themselves – including any possible planets – with energetic radiation.

Asteroid 3122 Florence: Video and images

This large asteroid swept closest to Earth on September 1. It’s big enough that astronomers are still catching it in small telescopes, as a small, slow-moving “star.”

Mystery of high-energy cosmic rays

Hold out your hand for 10 seconds. A dozen electrons and muons just zipped through your palm. These cosmic rays, scientists believe, come from violent explosions in deep space.

Space station transits sun during eclipse

There was only one part of Earth where you could catch the International Space Station crossing the sun’s face during the August 21 solar eclipse. These guys saw it, and created this video.

The hunt for asteroids

New short video from NASA about the hunt for potentially hazardous asteroids and comets, and ways to defend Earth against them.

Cassini prepares for last look at Titan

Even as the long-lived Cassini spacecraft gears up for its last moments at Saturn, it’s preparing for a final long-distance look at Titan, Saturn’s large moon, on September 11.

How do jellyfish swim?

Jellyfish float on ocean currents, but they also swim in a couple of different ways. This post has 2 videos showing 2 different jellyfish propulsion mechanisms.

Synchronized symphony of fireflies

This video shows a timelapse journey through Smoky Mountains National Park during world’s largest gathering of synchronized fireflies. Beautiful!

Video: Moon hoax not

SG Collins explains why the Apollo moon landings on the moon in the late 1960s and early ’70s couldn’t have been faked.

Fire ants build with no master plan

Researchers identified simple behavioral rules that allow these tiny creatures to collaboratively build elaborate structures – rafts and towers – with no one in charge.

Soar over Pluto and Charon

To celebrate the 2-year anniversary of New Horizon’s flyover of the Pluto system, NASA released these 2 cool videos. Sail over the surface of Pluto and its large moon Charon.

Moon shadow versus sun reflection

This 5-second video shows a reflected image of the sun – a sun glint – as a bright spot crossing Earth from right to left. It also shows a dark spot – the moon’s shadow – moving the opposite way.

Does your dog pronk?

Among wild animals, pronking may be a way of avoiding predators. But when you see an animal pronk, you can’t but think it’s leaping for joy.

No commands to Mars craft in late July

NASA says to blame the sun for its moratorium on sending commands to Mars from July 22 to August 1.

Astronomers track hypervelocity stars

New video shows 6 hypervelocity stars, zipping from Milky Way center to outskirts. An interaction with our galaxy’s central, supermassive black hole might have kicked them into fast motion.

Solar minimum is coming

Low ebb in the 11-year sunspot cycle expected 2019-2020. Want some basic information about the sunspot cycle and its effects? Watch this NASA ScienceCast.

Breathtaking night-shining clouds

Wonderful video showing noctilucent – or night-shining – clouds recorded on July 1 and 4. These clouds shine in the darkness, typically on summer nights.

Make a pinhole projector for eclipse-watching

You don’t need fancy equipment to watch a solar eclipse. This video shows you how to make a pinhole camera with just a few simple supplies.