Roeland van der Marel is an astronomer at the Space Telescope Science Institute and an adjunct professor at John Hopkins University. He is based in Baltimore, Maryland.
Astronomers say the Andromeda and Milky Way galaxies will collide in four billion years.
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| abtest-identifier | 1 year | No description |
| AnalyticsSyncHistory | 1 month | No description |
| ARRAffinityCU | session | No description available. |
| ccc | 1 month | No description |
| COMPASS | 1 hour | No description |
| cookies.js_dtest | session | No description |
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| donation-identifier | 1 year | No description |
| f | never | No description available. |
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| li_gc | 2 years | No description |
| loglevel | never | No description available. |
| msToken | 10 days | No description |