An enormous comet that is twice the size of Mount Everest has entered the inner part of our solar system and is about to pass through Earth in July. Comet C/2017 K2 (PANSTARRS), called K2 for short,… [+1912 chars]
Most of our knowledge about what sits at the center of our planet comes from the study of seismic waves rolling out from earthquakes. Careful analysis of these waves can reveal the composition of roc… [+3553 chars]
air pressure: The force exerted by the weight of air molecules. alien: A non-native organism. (in astronomy) Life on or from a distant world. atmosphere: The envelope of gases surrounding Earth, an… [+3945 chars]
