国产热热热精品,亚洲视频久久】日韩,三级婷婷在线久久,99人妻精品视频,精品九热人人肉肉在线,AV东京热一区二区,91po在线视频观看,久久激情宗合,青青草黄色手机视频

USEUROPEAFRICAASIA 中文雙語Fran?ais
World
Home / World / Kaleidoscope

Early Mars didn't have enough CO2 to keep water liquid: NASA

Xinhua | Updated: 2017-02-08 21:54

WASHINGTON - A new study based on data collected from a Mars rover indicated that the early Martian atmosphere did not contain enough carbon dioxide to keep the planet warm enough for liquid water.

The research, published in the Proceedings of the National Academy of Sciences on Monday, said although geological evidence from the NASA's Curiosity rover suggested the past presence of liquid water on Mars, the red planet had far too little carbon dioxide about 3.5 billion years ago to provide greenhouse-effect warming to thaw water ice.

The Curiosity collected rock samples from Gale Crater, which scientists believe was home to an ancient lake, but did not find any definitive proof for the existence of carbonate.

When carbon dioxide interacts with water on the surface of the Earth, it undergoes chemical reactions to produce carbonate, which can then interact with other elements and compounds to produce carbonate minerals at the bottom of bodies of water.

However, the rover has made no definitive detection of carbonates in any lakebed rocks sampled since it landed in Gale Crater in 2011, the study said.

Although Mars is now cold and dry, there is lots of evidence suggesting that the planet's surface was once covered with rivers, streams and lakes, forming a favorable condition for the development of life.

"It would be really hard to get liquid water even if there were a hundred times more carbon dioxide in the atmosphere than what the mineral evidence in the rock tell us," Thomas Bristow from NASA said in a statement.

 

Most Viewed in 24 Hours
Copyright 1995 - . All rights reserved. The content (including but not limited to text, photo, multimedia information, etc) published in this site belongs to China Daily Information Co (CDIC). Without written authorization from CDIC, such content shall not be republished or used in any form. Note: Browsers with 1024*768 or higher resolution are suggested for this site.
License for publishing multimedia online 0108263

Registration Number: 130349
FOLLOW US
平遥县| 贺州市| 色达县| 高州市| 应城市| 抚顺县| 宜君县| 夏邑县| 顺平县| 改则县| 平阴县| 玉田县| 天全县| 新昌县| 哈密市| 鹤壁市| 银川市| 明光市| 米脂县| 丹东市| 惠东县| 哈巴河县| 城固县| 盐城市| 隆昌县| 平定县| 东阿县| 塔城市| 本溪市| 招远市| 林芝县| 河东区| 富阳市| 安阳县| 中江县| 留坝县| 海兴县| 汪清县| 泰和县| 龙陵县| 延长县|