As aircraft and missiles attain higher and higher altitudes the question arises: Where, for practical purposes, does the atmosphere of the Earth end and interplanetary space begin?

introduced an amendment to the House bill that would provide more than $26 billion in aid to Israel to fund “space laser technology” to deploy on the U.S.’ southern border—most likely ...

An ambitious, multinational research project co-led by the University at Buffalo has demonstrated that Earth's biodiversity ...