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美国宇航局科学广播:2019年的特别开端

NASA ScienceCasts: A Super Start to 2019

2019年的良好开端
A Super Start to 2019
@NASA科学出品
presented by Science@NASA
2019年会是仰望天空
2019 will be an excellent year to look to sky
欣赏离我们最近的邻居—月球 的最佳年份
and enjoy the spectacular view of Earth’s nearest neighbor, the moon.
50年前
50 years ago,
我们见证了人类最非凡的成就之一
we witnessed one of humankind’s most remarkable achievements
第一次踏上了布满灰尘的月球表面
when we first stepped foot on the dusty surface of the Moon.
“这只是我的一小步 却是人类的一大步”
“That’s one small step for a man, one giant leap for mankind.”
随着美国宇航局庆祝阿波罗计划50周年
As NASA continues celebrating the 50th anniversary of the Apollo program,
这一年 众多让我们惊叹于
the year is opening with a number of opportunities
地球卫星的机会也纷纷到来
to marvel at Earth’s original satellite
三次超级月亮和一次月全食会在三个月内发生
Three Supermoons and a total lunar eclipse in the span of 3 months.
那么 是什么让超级月亮变得“超级”呢
So what is it that makes a Supermoon super?
先从大小讲起
Start with size.
月球以近似椭圆形的轨道绕地球运行
The Moon orbits around the Earth in a slightly oval shape.
运行到离我们最远的地方 被称为远地点
At its furthest point away from us, known as the Apogee
此时离地球大约25万英里(40万公里)
it’s about 250,000 miles (400,000 km) from earth
它离我们最近时 就是近地点
When it’s closest to us its Perigee
月球大约在22万英里(35万公里)之外
the Moon is about 220,000 miles (350,000 km) away.
当月球处于或是接近近地点时为满月状态时
When the Moon is full at or near its Perigee
它就会被认作超级月亮
it is considered a Supermoon,
此时它看起来比在远地点大14%
and can appear up to 14 percent larger
并且也要明亮30%
and 30 percent brighter than at Apogee.
然而 地月距离是不断变化的
Those distances, however, are changing
月球从地球边慢慢远去
as the Moon is slowly drifting away from Earth,
多慢呢
How slowly?
大约每年2英寸(5厘米)
Approximately 2 inches (5 cm) annually.
距今10亿年后
A billion years from now,
月球绕地球一周将需要31.5天
the Moon will take about 31.5 days to orbit the Earth
而不是现在的27.3天
instead of today’s 27.3 days.
与此同时
In the meantime
今年的第一个超级月亮发生在1月21日
this year’s first Supermoon of the year occurred on January 21st
并以月全食为特征
and also featured a total lunar eclipse.
第二次发生在2月19日
The second occurred on February 19,
当月球在3月21日升到地平线时
and sky watchers will have another chance
天文爱好者将还有机会
to see this beautiful large orb
来观赏这个美丽的天体
as it rises above the horizon on March 21st.
超级月亮和月全食令人叹为观止
While Supermoons and total lunar eclipses are marvels to behold,
在人类首次登月50年后 一个问题出现了
A question rises 50 years after humankind’s first steps on the Moon
它对NASA的科学家还有什么秘密吗
Does it hold any more secrets for NASA scientists?
Noah Petro 美国宇航局戈达德航天中心
Noah Petro Project Scientist for the Lunar Reconnaissance Orbiter (LRO)
月球勘测轨道飞行器项目科学家说道
at NASA’s Goddard Spaceflight Center says
“关于月球 有许多悬而未决的问题
“There are many unanswered questions about the Moon.
例如 我们仍在试图了解月球是如何演变成现在的状态的
For example, we are still attempting to understand how the Moon evolved to its current state.
在月球45亿年的历史中
The Moon has occupied space near the Earth
它一直占据着地球附近的空间
for its entire 4.5 billion year history,
记录着 随时间的推移 伤害其表面留下的痕迹
keeping record of the impacts that have scarred its surface over time.
由于风 水 板块构造的作用 这些古代撞击的记录
This record of ancient impacts is largely erased from the Earth
很大程度上从地球上消失了
due to wind, water, and plate tectonics.
对阿波罗号样本的分析
Analysis of Apollo samples
表明在太阳系早期 月球曾有过一段
shows that there was a period of intense impact cratering on the Moon
受到强烈撞击的时期
early in the history of the Solar System
由此推断 地球早期也是如此
and therefore on the early Earth as well.
来自绕月运行第9年的月球勘测轨道飞行器(LRO)的观测
Observations from LRO, now in its 9th year of orbiting the Moon,
正在帮助我们拼凑这段历史”
are helping us piece together this history. ”
随着2019年的不断呈现 3月21日第三次超级月亮的出现
As 2019 unfolds with a third Supermoon on March 21st,
欣赏月球继续展现的美妙景色和历史吧
enjoy the wonderful view and the history that the Moon continues to reveal.
想了解更多关于超级月亮 月食和其他夜空奇观的信息
For more illuminating facts about Supermoons,lunar eclipses,and other marvels of the night sky,
请访问https://science.nasa.gov/
visit science.nasa.gov

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想了解2019年的超级月亮、月全食吗?打开视频吧!

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