Michael O'Sullivan

Memorial to shooting victims in Las Vegas. https://t.co/8MFYAA2QAw

Student memorial for shooting victims at University of Nevada, Las Vegas https://t.co/PafdS8WyrG

Investigator at the shooting site in Las Vegas https://t.co/KOzrf2v4Xp

Site of the Route 91 music festival Sunday, where a gunman opened fire on thousands of concert goers https://t.co/SbNzggK2Ur

A city recovering from Sunday's mass shooting. The gunman shot from the 32nd floor of the Mandalay Bay hotel https://t.co/bdIXnRFxie

Signing memorial plaque to Las Vegas shooting victims. https://t.co/tBTEUgQ7fW

Lining up to give blood at a Las Vegas donation center Tuesday morning. https://t.co/Zd36g12D0F

Remembering the victims at an interfaith vigil for mass shooting victims at Guardian Angel Cathedral, Las Vegas. https://t.co/tkR01KIZTk

One of the last images of Saturn's atmosphere showing where #cassini plunged toward the planet in its grande finale. https://t.co/VfoUexhCuN

#cassini has "rewritten the textbook on Saturn"... "We will be back," say JPL/NASA officials. https://t.co/FecWitgDnd

Astronomer Larry Esposito says #cassini mission is both a funeral and celebration, a kind of "Irish wake," providing rich data on Saturn. https://t.co/R8J47nSaSe

A bitter-sweet moment as #cassini Saturn mission ends at 4:55 am Pacific time https://t.co/Wb0zv1Z8ia

Loss of signal marks end of #cassini Saturn mission 20 years after craft's launch. https://t.co/1g8IRAmQuL

Final countdown on #cassini Saturn plunge https://t.co/3wTfffzyUd

#Cassini on "last lap of 13-year marathon of scientific discovery," says project scientist Linda Spilker. Minutes to go to end of journey.

With gravitational "nudge" from moon Titan, Cassini's fate is sealed as it approaches final fiery plunge into Saturn's atmosphere https://t.co/h8vZ0e0KEC

Scientists at Jet Propulsion Laboratory in California prepare for final dive of Cassini spacecraft into atmosphere of Venus. https://t.co/oSXBO0TSvV