天文学（1）

旁白 neutral

The antenna picked up a weak signal from the distant satellite

天线接收到来自遥远卫星的微弱信号。

旁白 neutral

Scientists estimate that the universe is around 13.8 billion years old

科学家估计宇宙约有 138 亿年历史。

旁白 neutral

Astronomy studies the universe and celestial objects beyond Earth's atmosphere

天文学研究宇宙及地球大气层外的天体。

旁白 neutral

Mars is the fourth planet from the Sun and a key focus of space exploration

火星是太阳系第四颗行星，也是太空探索的重点目标。

旁白 neutral

Astronauts undergo rigorous training before embarking on a space mission

宇航员在执行太空任务前需接受严格训练。

旁白 neutral

The rocket was launched successfully , carrying a new weather satellite into orbit

火箭成功发射，将一颗新的气象卫星送入轨道。

旁白 neutral

It is the most sophisticated multistage rocket

它是最先进的多级火箭。

旁白 neutral

The cosmos contains billions of galaxies , each with countless stars

宇宙包含数十亿个星系，每个星系都有无数恒星。

旁白 neutral

The Earth is an oblate sphere , slightly flattened at the poles

地球是扁球体，两极略扁。

旁白 neutral

Planets are celestial bodies

行星是天体。

旁白 neutral

Our Milky Way galaxy is just one of billions in the observable universe

我们的银河系只是可观测宇宙中数十亿个星系之一。

旁白 neutral

For centuries , sailors used the polestar to navigate at night

几个世纪以来，水手们利用北极星在夜间导航。

旁白 neutral

Comets develop glowing tails when they approach the Sun due to solar radiation

彗星靠近太阳时，因太阳辐射而形成发光的彗尾。

旁白 neutral

Asteroids are rocky objects orbiting the Sun , mostly found in the asteroid belt

小行星是围绕太阳运行的岩石天体，主要分布在小行星带。

旁白 neutral

The museum displays a rare aerolite that fell to Earth thousands of years ago

博物馆展出一块数千年前坠落地球的稀有陨石。

旁白 neutral

Communication satellites enable global telephone and internet services

通信卫星实现了全球电话和互联网服务。

旁白 neutral

Orion is one of the most recognizable constellations in the night sky

猎户座是夜空中最易辨认的星座之一。

旁白 neutral

The Orion Nebula is a massive cloud of gas and dust where new stars are forming

猎户座星云是巨大的气体和尘埃云，新恒星正在其中形成。

旁白 neutral

Countries near the equator experience warm temperatures throughout the year

赤道附近国家全年气温温暖。

旁白 neutral

The sun reaches its zenith at midday

太阳午时到达天顶。

旁白 neutral

The satellite reached its apogee at 36 ,000 kilometers above Earth

卫星到达距地球 3.6 万公里的远地点。

旁白 neutral

During its orbit , the moon's perigee brings it closer to Earth than usual

在轨道运行中，月球的近地点使其比平时更靠近地球。

旁白 neutral

The solar corona is visible during a total solar eclipse as a faint halo around the Sun

日全食时，太阳的日冕可见，呈围绕太阳的 faint（faint 意为 “微弱的”）光环。

旁白 neutral

Sunspots , or maculae , are dark areas on the Sun's surface caused by magnetic activity

太阳黑子是太阳表面因磁活动形成的暗区。

旁白 neutral

A rainbow forms when sunlight passes through water droplets , separating into its spectral colors

阳光穿过水滴时分解为光谱色，形成彩虹。