In this week's Science Saturday, we look at science news ranging from rockets to climate change.

SpaceX explosion

SpaceX's rocket Starship exploded on its maiden flight. After about three minutes into the flight, the spacecraft tumbled out of control and crashed into the Gulf of Mexico. No one was hurt in the uncrewed test. SpaceX CEO Elon Musk has promised a second launch within months. The U.S. Federal Aviation Administration said it will ground the launch program for a "mishap investigation." The test's failure is likely to delay SpaceX's ambitions to take humans back to the moon and beyond. 

Fusion power technology

A new world record for China's "artificial sun"! The Experimental Advanced Superconducting Tokamak has achieved a highly confined plasma operation for 403 seconds. The breakthrough came after more than 120,000 shots. The new record is four times longer than the previous record of 101 seconds in 2017. China aims to build the world's first fusion demonstration reactor. And this new achievement marks a key step toward building high-efficiency, low-cost fusion reactors.

Age reversion

How do you reverse your biological age? A new study published in Cell Metabolism said stress can significantly age a person biologically. But once the body recovers from the stress, it can naturally reverse this effect, lowering the chance of mortality. This is because unlike our chronological age, which is determined by our birth date, experts said our biological age is affected by factors like disease, drug treatment, lifestyle changes and environmental exposures.

Climate change

The weather in 2022 was as bad as it seemed. The World Meteorological Organization said it was nasty, deadly, costly and hot. Deadly floods, droughts and heatwaves struck around the globe, costing billions of pounds. Global ocean heat and acidity levels hit record highs and Antarctic sea ice and European Alps glaciers reached record low amounts. Experts said these negative trends may continue until the 2060s despite efforts to reduce emissions of heat-trapping gases.