The second, the Stelliferous Era, includes the present day and all of the stars and galaxies we see.
现代天文学研究不仅调查恒星和星系,还调查远处恒星周围的行星,称为“外行星”,通常距离地球数千光年。
Modern astronomical research investigates not just stars and galaxies but also the planets around distant stars, termed“exoplanets”, often thousands of light years from Earth.
In recent years, astronomers have been detecting gamma-raybursts, galaxies and quasars at ever farther distances, closer to the birth ofthe universe's first stars and galaxies.
恒星和星系还没有形成。
The first stars and galaxies had not been formed.
恒星和星系并没有马上形成。
Stars and galaxies didn't form right away.
恒星和星系还没有形成。
No stars or galaxies had yet formed.
恒星和星系还没有形成。
Stars and planets would not have formed.
恒星和星系还没有形成。
Stars or galaxies have not been born yet.
这个时期恒星和星系并不存在。
During this period, stars and galaxies didn't exist yet.
大约3亿年之后,恒星和星系开始形成。
Some 300 million years later, stars and galaxies formed as well.
大约3亿年之后,恒星和星系开始形成。
This happened about 400 million years later when stars and galaxies started to form.
恒星和星系在宇宙形成后大约3亿年出现。
Stars and galaxies started to form around 300 million years later.
又过了几亿年,这些氢气构成第一批恒星和星系。
Hundreds of millions of years later, the hydrogen gas formed the first stars and galaxies.
发出紫外辐射的天体包括太阳以及其他恒星和星系。
Objects emitting ultraviolet radiation include the Sun, other stars and galaxies.
确实,构成行星,恒星和星系的原子可能只占5%。
Indeed, the atoms that make up stars, planets and galaxies probably make up only 5%.
确实,构成行星,恒星和星系的原子可能只占5%。
Indeed, the atoms that build planets, stars and galaxies probably account for just 5%.
又过了几亿年,这些氢气形成第一批恒星和星系。
In a few billion years, hydrogen and helium formed the first galaxies and stars.
科学家认为,这些尘埃和气体产生了恒星和星系。
Scientists believe this gas and dust are the building materials that make up stars and planets.
确实,构成行星,恒星和星系的原子可能只占5%。
In fact, the atoms that make up the stars, planets, and galaxies are probably only 5%.
今天,宇宙充满了大而复杂的结构,例如行星、恒星和星系。
Today, the universe is filled with large, complex structures such as planets, stars and galaxies.
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