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Blast waves from exploded stars can accelerate cosmic rays, but where they come from is hard to track. Using NuSTAR mission data, astronomers found that some cosmic rays come from Eta Carinae, a luminous and massive stellar system ~7,500 light-years away: https://go.nasa.gov/2MJYPBv pic.twitter.com/e7EsntcF6V

Racing around Earth at 16,000 mph, the twin #GRACEFO spacecraft shot lasers for the first time across a 137-mile distance between them to hit coin-sized holes on each satellite. This enables #GRACEFO to precisely monitor water & ice on the ground below: https://go.nasa.gov/2MMykeW pic.twitter.com/gnIfTCdoPg

#DidYouKnow that our Spirit and Opportunity @MarsRovers were only supposed to rove around the Red Planet for 90 days? Discover three reasons why DAYS turned into YEARS by listening to the latest episode of our Gravity Assist podcast: https://go.nasa.gov/2KJKism pic.twitter.com/TohkZJi8MW

#Oumuamua is the first object ever seen in our solar system that is known to have originated elsewhere. Here’s what we know (and don’t know) about this mysterious visitor: https://go.nasa.gov/2MM28Z7 pic.twitter.com/neeoWoSSzy

The @NASA_Dawn spacecraft reached its lowest-ever and final orbit around dwarf planet Ceres on June 6 and has been returning thousands of stunning images and other data. Get up close with these dramatic new views of Ceres: https://go.nasa.gov/2MJCowd pic.twitter.com/kYI0NKJzTs

Celestial Fireworks! Like a #4thOfJuly2018 fireworks display, this glittering collection of stars located 20,000 light-years away from Earth looks like a red, white & blue aerial burst. Take a closer look: https://go.nasa.gov/2KJxnXa pic.twitter.com/NroJl2u1QP

Did you know? Robotic technology originally designed for the @Space_Station is finding its way into healthcare by targeting breast cancer tumors. Learn how we're fighting cancer from space: https://youtu.be/NMc-5QGBPp8 pic.twitter.com/pE6KHYV2VM

What’s up for July? Mars makes its closest approach to Earth in 15 years! Get the details on when and how to observe the Red Planet’s dazzling show in the night’s sky! https://go.nasa.gov/2MDNEub pic.twitter.com/tSHOVzMACH

Frosty! Layered deposits in Mars' north polar region include a thick stack of icy layers. Part of this January 2018 image from our Mars Reconnaissance Orbiter has lingering seasonal frost, which serves to accentuate those layers. Take a closer look: https://go.nasa.gov/2KvGpIk pic.twitter.com/frqb0NwKV6

Parades & fireworks make for a festive July 4th, but mosquito bites, not so much. A tool researchers use to track mosquitoes is citizen data with @NASAEarth observations to create new forecast models to predict the spread of mosquito-carrying diseases: https://go.nasa.gov/2KzTKOL pic.twitter.com/b0NRjC0lDw

LAST DAY TO APPLY We’re inviting social media users to go behind-the-scenes on one of our research vessels before we embark on an expedition to study the ocean’s #TwilightZone. Apply to attend this #NASASocial event in Seattle on Aug. 9: https://go.nasa.gov/2MGYmAh pic.twitter.com/P1L7He3dWN

Today, our #ECOSTRESS space instrument arrived at our orbiting laboratory 250 miles above our home planet. It will help us better understand volcanoes , fires , urban heat and coastal and inland waters located here on Earth. Here’s how: https://go.nasa.gov/2KJgqfP pic.twitter.com/i5o1eQ3qtT

Three days after its launch from Florida, the @SpaceX #Dragon cargo spacecraft has been installed on the Earth-facing side of the @Space_Station’s Harmony module for a month-long stay. Details: https://blogs.nasa.gov/spacestation/2018/07/02/dragon-now-installed-to-station-for-month-long-stay/ …pic.twitter.com/96CLZE1StZ

At 9:52am ET, @SpaceX's #Dragon cargo craft was bolted into place and is now attached to the @Space_Station where it will be for the next month delivering more than 5,900 pounds of research, crew supplies and hardware to the orbiting laboratory. Watch: https://www.nasa.gov/live pic.twitter.com/X5GQSxyHkB

Have a question about today's arrival of the @SpaceX #Dragon cargo craft at the @Space_Station? Ask it now using the hashtag #askNASA and our experts will answer some during our broadcast. Watch: https://www.nasa.gov/live pic.twitter.com/WVL67V57fP

LIVE NOW: Watch coverage of the installation of @SpaceX's #Dragon cargo craft to the @Space_Station, delivering more than 5,900 pounds of research, equipment, cargo and supplies that will support dozens of investigations aboard the orbiting laboratory: https://www.nasa.gov/live pic.twitter.com/gJgLwu3kA7