Through computer simulations and real data, experts estimate the number of planets about the same size as the Earth and may exist life.
NASA's state-of-the-art planetary hunter TESS has discovered a strange planetary system, including the smallest known planet in TESS's search history.
Before the Sun was fully enlarged and turned into a giant red star swallowing the Earth, human descendants may have migrated to other planets like Neptune.
Recently, scientists revealed the discovery that shocked the 7 planets like Earth.