Northern lights over Jämtland, Sweden.

The discovery of exoplanet GJ 3512b - a planet "too big for its star" - adds fuel to the competition between 2 theoretical models of how planets form. It suggests many more Jupiter-like planets are waiting to be found, orbiting nearby sunlike stars.

Maps of the long filaments of gas that hold the universe together might one day help trace and unveil dark matter.

Researchers have found evidence of a cataclysmic flare that punched outward in both directions from our galaxy's center, reaching so far into intergalactic space that its impact was felt 200,000 light-years away.

"The Milky Way is on a collision course with Andromeda in about 4 billion years. So knowing what kind of a monster our galaxy is up against is useful in finding out the Milky Way's ultimate fate."

Astronomers probed the cosmic web, a large-scale structure composed of massive filaments of galaxies separated by giant voids. They found the filaments also contained significant amounts of gas, believed to help fuel the galaxies' growth.

East quadrature is a hallmark in the ever-shifting 3-D relationship between Earth and another planet. It means, as seen from Earth, the planet is 90 degrees east of the sun. Saturn will reach that point on October 7, 2019.

"Nature's green magic over Sweden," said photographer Jörgen Norrland Andersson, who captured this image on September 27, 2019 Thank you Jörgen!

Tonight - October 5, 2019 - the moon will be at or near its first quarter phase, coupling up with Saturn on the sky's dome. What's more, the lit side of the moon will be pointing at the blazing planet Jupiter.

Alex Ustick captured the launch of Minuteman III - an unarmed test missile - from Vandenberg Air Force Base in Lompoc, California.