Mountains form some of the most spectacular landscapes in the world. In the highest mountains, huge peaks with steep sides are separated by deep valleys, cut by ice or fast-flowing rivers. Mountainous areas make up around a quarter of the land surface and are found across all continents.
Places where life can thrive vary widely on planet Earth. Scientists find the greatest diversity in rainforests with abundant water and mild year-round temperatures.
In contrast to Earth, somewhere like Mars seems like a bleak wasteland. With an atmosphere that’s about 100 times thinner than Earth’s, the planet surface can’t hold in heat well. A summer day at the Martian equator might get up to 20℃ at noon
生命可能在哪些环境下生存？ Continue reading »
A car drives along an empty stretch of highway late one night in the mountains of New Hampshire, USA. Out of nowhere, a bright light appears. Could it be a falling star? It is September 19, 1961, and Betty and Barney Hill are on their way home from vacation in Montréal, Canada. Strangely, the bright light seems to follow them. Then the car starts to vibrate and the Hills hear strange buzzing and beeping sounds. A feeling of drowsiness washes over them.
