How many stars are there in space?

Scientists have a good estimate on the staggering number of stars in the universe.

Brian Jackson, Associate Professor of Astronomy, Boise State University • conversation
yesterday ~5 min

SpaceX: Inspiration4 amateur astronauts return to Earth after three days

The four amateur astronauts landed safely in the Atlantic Ocean after three days orbiting Earth.

Sept. 18, 2021 ~2 min

Are we ready? Understanding just how big solar flares can get

Recasting the iconic Carrington Event as just one of many superstorms in Earth’s past, scientists reveal the potential for even more massive, and potentially destructive, eruptions from the sun

Christopher Crockett • knowable
Sept. 17, 2021 ~16 min

3D-printed rocket engines: the technology driving the private sector space race

The rocket engines that lauched Apollo 11 towards the moon had 5,600 parts each. 3D-printed equivalents have just 40.

Oliver Hitchens, PhD Candidate, Department of Electrical and Electronic Engineering, University of Surrey • conversation
Sept. 17, 2021 ~7 min

How many satellites are orbiting Earth?

In the past decade, the number of satellites in orbit has skyrocketed thanks to tiny electronics and cheap launches. The crowded night sky is posing problems for astronomers and astronauts.

Supriya Chakrabarti, Professor of Physics, University of Massachusetts Lowell • conversation
Sept. 17, 2021 ~6 min

Astronauts return to Earth after China's longest space mission

The three astronauts spent 90 days at China's space station, some 380km above Earth.

Sept. 17, 2021 ~2 min

Inspiration4: All-amateur space crew enjoy views of Earth

The first pictures have been released showing the Inspiration4 crew looking down on the planet.

Sept. 17, 2021 ~2 min

First All-Civilian Crew Launches into Earth Orbit

VOA Learning English • voa
Sept. 16, 2021 ~5 min

Have we detected dark energy? Cambridge scientists say it’s a possibility

Dark energy, the mysterious force that causes the universe to accelerate, may have been responsible for unexpected results from the XENON1T experiment, deep

Cambridge University News • cambridge
Sept. 15, 2021 ~6 min

James Webb Space Telescope: An astronomer on the team explains how to send a giant telescope to space – and why

The largest orbital telescope ever made will allow astronomers to study the atmospheres of alien planets, learn about how stars form in the Milky Way and peer into the farthest reaches of the universe.

Marcia Rieke, Regents Professor of Astronomy, University of Arizona • conversation
Sept. 15, 2021 ~9 min