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Before taking its final dive, @CassiniSaturn took one last glance at Saturn’s icy moon Rhea: http://go.nasa.gov/2jLPUX4 pic.twitter.com/AWvCOnBlYG

A quirky comet, with an unexpected chemical fingerprint, zipped past Earth earlier this year and is changing our thinking on how comets form and evolve. Details: http://go.nasa.gov/2jLq3yy pic.twitter.com/5G7U5ACwj2

If you plant it, will it grow…in space? See how astronauts are producing fresh, palatable & nutritious food like this hearty red lettuce aboard the @Space_Station: http://go.nasa.gov/2jMTpwh pic.twitter.com/uhF1X1fqre

Water from melted ice on land doesn’t spread evenly across the world’s oceans. This new tool links changes in sea level in 293 port cities to specific regions of melting land ice. Take a closer look: http://go.nasa.gov/2jLaVBg pic.twitter.com/yTG0XZrX8m

After more than 13 years at Saturn, and with its fate sealed, @CassiniSaturn bid farewell by capturing this last, full mosaic of Saturn and its rings on Sept. 13: http://go.nasa.gov/2hRJUf5 pic.twitter.com/roPmM1LzTl

A shadowy, dark expanse extending across the top of the Sun and down each side was the most prominent feature in this Nov. 11 Solar Dynamics Observatory image: http://go.nasa.gov/2hRtNy7 pic.twitter.com/34NbRfqXk0

Exploration requires mobility. And whether you’re on Earth or as far away as the Moon or Mars, you need good tires to get your vehicle from one place to another. Take a look at how we reinvent the wheel: http://go.nasa.gov/2jImUPQ pic.twitter.com/7jQvIwe8n7

#ICYMI: With a bright flash & a streak of light @NOAA’s #JPSS1 launched Saturday with 4 tiny hitchhikers designed to advance flight-qualified technology & enhance weather prediction. Find out more: http://go.nasa.gov/2jJJBmJ pic.twitter.com/5VjLXBGNKN

Seasonal weather predictions can be extremely useful to agricultural planning and for anticipating large-scale climate events. See how an instrument launched on @NOAA’s #JPSS1 could improve near-term, seasonal forecasts: http://go.nasa.gov/2jH8cc5 pic.twitter.com/dv0YeQNUvD

The 40-ton door of a chamber that brought @NASAWebb telescope to frigid space-like temps was unsealed Nov. 18 after ~100 days of cryogenic testing. We take a look at the telescope inside: http://go.nasa.gov/2jJG4Vv pic.twitter.com/w5FWT02Btc

A developing region of dense, cool gas was recently captured churning and twisting near the edge of the Sun by our @NASASun observatory from Nov. 16-17. Take a look: http://go.nasa.gov/2hQLwW5 pic.twitter.com/nj9wfYCTvV

.@SpaceX targets Monday, Dec. 4 at 2:53pm ET for the next launch of science & supplies to @Space_Station. Details: http://go.nasa.gov/2hQ2LHl pic.twitter.com/olBgLuekG7

Dark features on Mars previously considered evidence for subsurface flowing of water are interpreted by new research as granular flows, where grains of sand and dust slip downhill to make dark streaks. Find out more: http://go.nasa.gov/2jIV8CP pic.twitter.com/NPlebxRVI3

An interstellar visitor…scientists have confirmed that an intriguing asteroid that zipped through our solar system in Oct. is the 1st confirmed object from anther star! Learn more about this rocky, cigar-shaped object: http://go.nasa.gov/2hORPJK pic.twitter.com/GUBWOQtnaU

LIVE NOW: Join some of the first scientists to detect light and gravitational waves -- ripples in space-time -- caused by colliding neutron stars: https://www.facebook.com/nasamarshallcenter/photos/a.382186525761.161304.374623305761/10155936777260762/?type=3 …pic.twitter.com/b0jZibVPx6

Join @NASA_Marshall at noon ET for a Q&A on Facebook with some of the first scientists to detect light and gravitational waves -- ripples in space-time -- caused by colliding neutron stars: https://www.facebook.com/NASAMarshallCenter …pic.twitter.com/6a792XyCuE