Why Is Space Dark If the Universe Is Full of Stars?
If the universe contains an enormous number of stars, why is the night sky mostly dark? The answer reveals important clues about the universe’s age, expansion and history
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If the universe contains an enormous number of stars, why is the night sky mostly dark? The answer reveals important clues about the universe’s age, expansion and history
Read MoreStars seem to flicker in the night sky, while planets often glow steadily. The difference reveals how Earth’s atmosphere affects the light reaching our eyes.
Read MoreThe Moon often appears enormous when rising above the horizon, yet its actual size barely changes. Discover why our eyes perceive it differently.
Read MoreA military infrared video associated with a submarine has renewed interest in unidentified objects over the ocean. But does it really show craft entering and leaving the water? A closer look at the available record reveals a more complicated story.
Read MoreScientists are proposing an unusual place to search for extraterrestrial technology: the Moon’s dusty surface. Instead of looking for alien buildings or spacecraft, the research would investigate whether microscopic engineered particles could have survived in lunar soil for billions of years.
Read MoreA thermal-camera image captured near Area 51 has revived questions about America’s secret aircraft programmes. Is it a glimpse of a next-generation fighter, an experimental prototype or something that remains unidentified?
Read MoreA new disagreement over NASA’s UAP records has revived questions about government transparency. What has the agency made public, what are critics asking for and how can anyone establish whether disclosure is complete?
Read MoreAcross the world, ancient people carved extraordinary doorways into stone. Some became associated with gods, spirits and other worlds. But were they symbolic entrances, unfinished monuments or evidence of something more mysterious?
Read MoreStories of secret gateways connecting Earth to distant planets have fascinated people for generations. From ancient stone monuments to modern wormhole theories, where did these ideas originate, and is there any credible evidence behind them?
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