<p>Sometime around the year 1837, a strange object passed an invisible cosmic mile marker: 1,000 astronomical units from the Sun. (One astronomical unit, or AU, is the average Earth-Sun distance.) For more than a century, it continued undetected toward our star. Finally, on Oct. 19, 2017, humans noticed the visitor. That night, a faint, thin<a class="more-link" href="https://www.astronomy.com/today-in-the-history-of-astronomy/oct-19-2017-the-discovery-of-oumuamua/">Continue reading <span class="screen-reader-text">"Oct. 19, 2017: The discovery of ‘Oumuamua"</span></a></p>
<p>The post <a href="https://www.astronomy.com/today-in-the-history-of-astronomy/oct-19-2017-the-discovery-of-oumuamua/">Oct. 19, 2017: The discovery of ‘Oumuamua</a> appeared first on <a href="https://www.astronomy.com">Astronomy Magazine</a>.</p>
Sometime around the year 1837, a strange object passed an invisible cosmic mile marker: 1,000 astronomical units from the Sun. (One astronomical unit, or AU, is the average Earth-Sun distance.) For more than a century, it continued undetected toward our star. Finally, on Oct. 19, 2017, humans noticed the visitor. That night, a faint, thinContinue reading “Oct. 19, 2017: The discovery of ‘Oumuamua”
The post Oct. 19, 2017: The discovery of ‘Oumuamua appeared first on Astronomy Magazine.