Quartz (mm)

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   there are some astronomical observations that indicate the presence of millimeter-sized cosmic dust grains. Such is the case of comet 67P/Churyumov-Gerasimenko (<a href="https://iopscience.iop.org/article/10.1088/2041-8205/802/1/L12/pdf" target="_blank" title="Fulle et al. 2015">Fulle et al. 2015</a>, <a href="https://www.science.org/doi/abs/10.1126/science.aaa3905" target="_blank" title="Rotundi et al. 2015">Rotundi et al. 2015</a>), circumstellar disks (e.g., <a href="https://iopscience.iop.org/article/10.1086/432712" target="_blank" title="Andrews &amp; Williams 2005">Andrews &amp; Williams 2005</a>; <a href="https://www.aanda.org/articles/aa/abs/2015/10/aa27267-15/aa27267-15.html" target="_blank" title="Canovas et al. 2015">Canovas et al. 2015</a>, <a href="https://academic.oup.com/mnrasl/article/458/1/L29/2589497" target="_blank" title="Canovas et al. 2016">2016</a>; <a href="https://iopscience.iop.org/article/10.3847/0004-637X/820/1/54/meta" target="_blank" title="Kataoka et al. 2016">Kataoka et al. 2016</a>), in particular, the circumstellar disk orbiting Fomalhaut and HR 4796A (<a href="https://www.nature.com/articles/nature03601" target="_blank" title="Kalas et al. 2005">Kalas et al. 2005</a>, <a href="https://www.aanda.org/articles/aa/abs/2017/03/aa27838-15/aa27838-15.html" target="_blank" title="Milli et al. 2017">Milli et al. 2017</a>, <a href="https://www.aanda.org/articles/aa/full_html/2010/01/aa13065-09/aa13065-09.html" target="_blank" title="Min et al. 2010">Min et al. 2010</a>)
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