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earth
21 小时
Comets may have delivered water to Earth
Recent studies show comet dust influenced earlier measurements of water’s origins on Earth, challenging previous findings.
3 小时
Rare Icy Comet Discovered Between Mars and Jupiter
A celestial object found in 2021 within the asteroid belt was confirmed as a main-belt comet, distinguished by its icy composition and comet-like behaviors when near the Sun. Researchers emphasize the ...
5 小时
Where Did Earth's Oceans Come From? Scientists Say They Originated From Comets
Scientists have long debated how Earth became rich in liquid water after the planet formed about 4.5 billion years ago. Now a ...
18 分钟
on MSN
What is Sunita Williams mimicking in space? NASA reveals her ‘Astrobee’ act
Astronaut Sunita Williams recently tested the Astrobee, a robotic flyer which is designed to help humans perform daily chores ...
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