Aurora

Some solar cycles feature lots of activity, while others can be relatively quiet.

The "dunes" can be found at an altitude of around 62 miles in the upper part of an atmospheric layer known as the mesosphere.

The Space Weather Prediction Center says the "moderate" storm will arrive on May 16.

A sunspot region produced a series of coronal mass ejections starting on May 10.

Gary Martin was a 15-year employee of the Henry Pratt Company. Aurora Police Chief Kristen Ziman said that Martin was being terminated from his job on Friday. The 45-year-old began shooting around 1:24 p.m. local time.

Schools in the area were placed on soft lockdown after reports of an active shooter in Aurora, Illinois.

Tanye McNeal of Aurora, Illinois, faces multiple charges over the incident in a hospital emergency room which was captured in a cell phone video.

Canada's largest companies all saw morning gains, as investors grew more confident in the wake of legalization rolling forward south of the border, in the U.S.

STEVE appears as a single slim ribbon of glowing purple and white light extending for hundreds or thousands of miles

Marijuana companies are searching for employees in a wide variety of capacities, ranging from menial labor to scientific research, as well as sales and management.

The incredible patterns will help scientists unlock the secrets of the planet's surrounding plasma.

Denver Mayor Michael Hancock called his son's actions and words "inexcusable."

Meet "Steve," a beautiful but mysterious arc of light.

A citizen scientist posted photos of this never-before-seen Aurora in a Facebook group.

The rockets will leave from the northernmost launch sites in the world.

Unlike normal northern lights, these aurora dim and brighten, hence their name.

Here's how to see it.

The auroras were basically constant for more than a week.

The chair of U.S. movie chain Cinemark donated to the Roy Moore campaign.

If you live in these states, find a dark place to look at the sky and you may see something absolutely incredible.

The country has stopped short of joining NATO.

The president used similar language after the Manchester attack in September.

Feast your eyes: The Northern Lights have had an incredible week.

An unusually active sun is making for fireworks here on Earth.

Auroras don't often come this far south, so here's how to know if you can see it.

An astronaut on board the International Space Station shared time-lapse footage of the aurora australis shot while the spacecraft traveled at 17,500 mph.

Panorama looks at pills taken by Aurora Batman killer James Homes in widely criticized program.

Stefan Moton, who survived the mass shooting at the Colorado theater, makes his case for Obamacare.

When pictures first starting appearing on social media, the odd aurora was widely assumed to be what is known as a "proton arc", but scientists knew that this wasn't right.

The 'Newtown' filmmakers are showing support to Aurora victims facing payment of $700,000 in legal fees.