October 21st, 2011
11:30 AM ET


Every Friday, @CNNLightYears will suggest interesting space and science Twitter accounts to follow.

Today, @CNNLightYears is giving a #FollowFriday to the German Aerospace Agency (DLR) as that pieces of the Roentgen Satellite (ROSAT), a retired German satellite, may hit Earth this weekend.

The English version of the DLR is tweeting updates about the re-entry of ROSAT. Right now, it is expected between October 22 and 23 UTC plus/minus one day. However, the time and location of re-entry can't be predicted precisely yet. On the day of re-entry the estimate will be accurate within plus/minus 5 hours. As with the falling satellite UARS, which entered Earth's atmosphere over the Pacific Ocean in September, most of ROSAT will burn up in the atmosphere. @DLR_en says that up to 30 individual pieces of ROSAT weighing a total of almost 2 tons may reach the surface of Earth. ROSAT was launched in June of 1990 to perform an all-sky survey of X-ray sources with an imaging telescope for the first time, researching states of matter such as black holes and neutrons stars. @DLR_en is also using the Twitter hashtags #ROSAT.

Click here to track ROSAT.

You can also follow Twitter updates on the re-entry of ROSAT from @CNNLightYears.

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