Hypervelocity stars were discovered only 15 years ago and are the closest things in existence to real shooting stars. They travel at millions of miles per hour, so fast that they can escape from galaxies.

Only a planet crashing into it might stop the Earth’s spin.

Plus, the tactics the food industry is using to boost sales of ultra-processed foods in middle-income countries. Listen to The Conversation Weekly.

We have to look back to the Big Bang to find out.

Human activities in space today are far more numerous and complicated compared to the 1967. Two experts explain the need for better laws to keep space peaceful.

Saturn, Jupiter, Neptune and Uranus all have rings.

Russia destroyed one of its old satellites during a successful test of an anti-satellite weapon. A space security expert explains what this weapon was and the dangers of the expanding debris field.