来自MSN6 个月
Earth's plate tectonics fired up hundreds of millions of years earlier than we thought ...
In this era, known as the Hadean, Earth was fresh and piping hot, with an ammonia-and-methane atmosphere imbued with enough water to eventually condense into a planet-wide ocean. During this ...
来自MSN1 个月
Earth wasn't as riotous and violent right after its birth as we once thought
Right after Earth was born, it is believed to have been a hostile volcanic hellscape filled with magma. The Hadean period, the first phase of our planet's life, started 4.54 billion years ago and ...
PBS8 年
Deep Time
The Precambrian encompasses 86 percent of the history of Earth. As its name implies, this includes all of geological time prior to the Cambrian period. Hadean Era (4,550-3,850 mya) The Precambrian ...
Nature3 年
Major events in the evolution of amino acid synthesis
The way amino acids are synthesized has changed during the history of Earth. The Hadean eon represents the time from which Earth first formed. The subsequent Archean eon (approximately 3,500 ...