Comet Hale-Bopp

四月 11, 1997

(Photograph) - Astronomers at Queen Mary and Westfield College, London, and Queen's University, Belfast, are studying Comet Hale-Bopp as it passes the sun.

According to Iwan Williams of QMW, the comet's nucleus, made of snow and dust, is only 25km across and not visible even with telescopes. But as the comet passes the sun, the melting snow and dust particles form a cloud around the nucleus which is then pushed by the sun's radiation to form the distinctive tail behind the comet in a direction away from the sun. The dust particles reflect sunlight, making the comet clearly visible from earth. The British researchers have recorded jets of dust coming from the nucleus, which they say suggests the nucleus is covered by dust and that rather than uniformly melting, dust and water is released through vents where the surface cover has thinned.

Please
or
to read this article.

请先注册再进行下一步

获得一个月的无限制地在线阅读网站内容。只需注册并完成您的职业简介.

注册是免费的,而且非常简单。一旦成功注册,您可以每个月免费阅读3篇文章。:

  • 获得编辑推荐文章
  • 率先获得泰晤士高等教育世界大学排名相关的新闻
  • 获得职位推荐、筛选工作和保存工作搜索结果
  • 参与读者讨论和公布评论