EarthSky

Artist’s illustration of the orbits of Earth and Mars via NASA http://bit.ly/1VpKjA5  Mars closest to Earth todaypic.twitter.com/5uuoFSsTUw

Popular at EarthSky: Hurricane names 2016 http://bit.ly/1sFj7So pic.twitter.com/UREQAU22S6

A new supernova! http://bit.ly/22tOR9A  Photo via Gianluca Masi at the Virtual Telescope Project in Italy.pic.twitter.com/z3TlF2vAnW

This morning's moon from our friend Lunar 101 - MoonBook Moon now in waning crescent phase: http://bit.ly/25tJfy1 pic.twitter.com/wVXLAMyjqA

Mars closest to Earth today. http://bit.ly/1sm9urW  It'll appear brightest in our sky from about May 18-June 3.pic.twitter.com/c6pvt9NPNm

Mars closest to Earth today http://bit.ly/1sWOwR5  We passed between Mars and the sun 8 days ago, on May 22.pic.twitter.com/DuXGxKqtS3

Popular at EarthSky: Top 10 cool things about stars http://bit.ly/22sIPG8  … that you might not know.pic.twitter.com/Bl8idlrY5G

Popular at EarthSky: Close-up on Pluto http://bit.ly/22sIoeZ  Most detail we'll see for a very long time.pic.twitter.com/MCYiQ1MDqZ

Popular at EarthSky this week: New clues on ancient asteroid strike http://bit.ly/1TO0C7B  3.4 billion years agopic.twitter.com/4yL78pt6au

Popular at EarthSky this week ... Man-eating crocodiles http://bit.ly/1U4LDmT  Florida’s newest invasive species?pic.twitter.com/dreQ56wlDx

NASA’s Stereo-A probe caught Saturn and Mars … with Earth in between! http://bit.ly/1XGhWxP  #totallyawesomepic.twitter.com/PY3wop50MW

Mars will be closer to Earth on May 30 than it's been in a decade ... http://bit.ly/1TNZTDn pic.twitter.com/iRuZlY2277

Simulation of first quarter Earth as viewed from today's last quarter moon http://bit.ly/22rLeB7 pic.twitter.com/y5X9NeeF92

Last Thursday night's incredible orange moon over the Empire State Building Via our friend Jennifer Khordi in NJpic.twitter.com/zbPxjfjJON

Best time to see Saturn is here! http://bit.ly/1XYbBhD  We'll pass between Saturn and the sun on June 3.pic.twitter.com/vK6wbi6Brm

Where is the moon? Last quarter http://bit.ly/22sNyrx  Photo Lunar101-MoonBookpic.twitter.com/Ly1MPoFA25

New ISS module - BEAM - being expanded and pressurized! http://bit.ly/1P8zJME  First new ISS module since 2011pic.twitter.com/ROwEKdtFHE

Moon phase is last quarter http://bit.ly/1X5mdfQ  Photo of this morning's moon by Deirdre Horan in Dublinpic.twitter.com/hDIqfuf6RT

ISS pass over a "tajinaste" plant in Spain's Canary Islands Photo captured this week by Roberto Porto, on Tenerifepic.twitter.com/D57YrSYVpA

First noctilucent clouds of the season reported! Photo by Mike Griffiths at Spacweather http://bit.ly/1TLulOi pic.twitter.com/529uI7ZvKw

ISS passing under Big Dipper earlier this week http://bit.ly/1NU8kOg  Via Ken Gallagher in Lake Havasu, AZpic.twitter.com/YWtZKSS0Oi

On May 29, before dawn, Comet C/2013 X1 is just 2 moon diameters above Skat, in Aquarius... http://bit.ly/1TpONnV pic.twitter.com/CR08Ga3Ehd

Crepuscular rays at Friday's dawn over Sabah, North Borneo. Photo via our friend Jenney Disimonpic.twitter.com/HRS5dr342v

Flowers covered with ash this week from nearby Turrialba volcano, via Rosie S. Freeman in San José Costa Ricapic.twitter.com/PxY94Ige4N

Tonight … Half-lit last quarter moon http://bit.ly/22rKuvM pic.twitter.com/dTpquVkWj8

Photos from Brazil last night show aerosols at sunset. Hello C. Vital wrote: "From Chile`s Villarrica volcano?"pic.twitter.com/XHB4CwxpnI

Life ingredients in Rosetta's comet! http://bit.ly/1UjU4NV pic.twitter.com/NRgHvS8SHm

Storm in Alvin, Texas last night, via Brett Stone. Hear what Stevie Ray had to say: http://bit.ly/1U2LVKU pic.twitter.com/u4A0o2MzRE

This morning's moon from our friend Lunar 101-Moon Book Last quarter moon due tomorrow: http://bit.ly/1U2LTmj pic.twitter.com/oCbQrKch9z

Is dark matter made of black holes? http://bit.ly/25qp5bw pic.twitter.com/lJQnjh8Ekq

Best close-up of Pluto's surface http://bit.ly/1WqclMV  Taken by the New Horizons spacecraftpic.twitter.com/DL6oUWLkms

Check out these 4 keys to understanding moon phases http://bit.ly/25qorL8 pic.twitter.com/O14yKvb6vw

Tonight … Look for the beautiful Northern Crown http://bit.ly/1RwzaGQ pic.twitter.com/pIffbxhrOO

Friday FAQ: How do hurricanes get their names? http://bit.ly/1TIZKAV  Hurricane names for 2016 .pic.twitter.com/8P9ql4aXGf

Moon in 2016 http://bit.ly/1NRTAzo  Phases, cycles, and motions of the moon - including eclipses and supermoons.pic.twitter.com/vvmN635j0X

Cloud-free Africa http://bit.ly/1XCUjXe  ESA used 7,000 satellite images to make this mosaicpic.twitter.com/zMfv3aXWe5

Mars will be closer to Earth on May 30 than it's been in a decade ... http://bit.ly/1Vkb1tQ pic.twitter.com/AQ3OjzOY4h

NASA’s Stereo-A probe caught Saturn and Mars … with Earth in between! http://bit.ly/25nOeUf  #totallyawesomepic.twitter.com/LWcOn1Zc7s

Mars rising from Weatherly, Pennsylvania last night thanks to Tom Wildoner of http://LeisurelyScientist.com !pic.twitter.com/aHW6VDKGbH

Mars will be closer to Earth on May 30 than it's been in a decade ... http://bit.ly/1U9mUh4 pic.twitter.com/jSOvmTuqZn

Saturn south polar vortex http://bit.ly/1NAIEpD  It's beautiful and lets astronomers peer into Saturn's atmospherepic.twitter.com/NjKV0DPJt7

Tonight, look again for the great M13 star cluster in the constellation Hercules! http://bit.ly/25nGhi3 pic.twitter.com/NZwch11x6K

Is dark matter made of black holes? http://bit.ly/1NPwXvf  A new study analyzes this possibility.pic.twitter.com/mYnxH14Afx

Clues to birth of supermassive black holes http://bit.ly/1OZTtC4  #artistimpression #NASApic.twitter.com/lsW15DsLom

Sunrays seen from Chile http://bit.ly/1YGlONZ  Above the famous volcano Licancabur Photo: Yuri Beletskypic.twitter.com/CQI5yG6vz8

Tonight, find the Keystone http://bit.ly/1ThToeK  A noticeable pattern of 4 stars in the constellation Herculespic.twitter.com/SAH8k0WSLK

Tonight's sunset over a reservoir in Singapore, by A Kannanpic.twitter.com/gJ7qlsUpP5

NASA's Stereo-A probe caught Saturn and Mars with Earth in between. http://bit.ly/25h2Xgp  Thanks, @coreyspowellpic.twitter.com/26xUEeDHZ5