Bob Riddle
@currentsky.bsky.social
Semi-Retired Teacher (Earth Science/Planetarium Director-43 yrs.). Column Editor Scope on the Skies, Science Scope Magazine (National Science Teaching Association). NASA Volunteer Educator Since 1985: Cassini Fellow; ISTP;SSEP;SSA. Day or night photography
Here's my latest essay on Substack.
The Earth has 2, Maybe 3, Moons
One is our full-time Moon; the others are a 'quasi-satellite' or are they a Mini-Moon?
open.substack.com
November 18, 2025 at 2:04 PM
Here's my latest essay on Substack.
Be sure to thank a Veteran. We did it for you.
November 11, 2025 at 1:32 PM
Be sure to thank a Veteran. We did it for you.
Something to share. Like the saying goes, "It's our home, our only home."
NASA’s Juno spacecraft during its Earth flyby to capture this Oct. 9. 2013
Key details:
• Distance: Approximately 4,000 km from Earth.
• Region visible: South America and Antarctica.
• Source: NASA’s Juno mission.
NASA’s Juno spacecraft during its Earth flyby to capture this Oct. 9. 2013
Key details:
• Distance: Approximately 4,000 km from Earth.
• Region visible: South America and Antarctica.
• Source: NASA’s Juno mission.
November 9, 2025 at 4:19 PM
Something to share. Like the saying goes, "It's our home, our only home."
NASA’s Juno spacecraft during its Earth flyby to capture this Oct. 9. 2013
Key details:
• Distance: Approximately 4,000 km from Earth.
• Region visible: South America and Antarctica.
• Source: NASA’s Juno mission.
NASA’s Juno spacecraft during its Earth flyby to capture this Oct. 9. 2013
Key details:
• Distance: Approximately 4,000 km from Earth.
• Region visible: South America and Antarctica.
• Source: NASA’s Juno mission.
A late night get together! Should be fun, the Twins are here!!
November 8, 2025 at 9:15 PM
A late night get together! Should be fun, the Twins are here!!
Been hospitalized for the last 3 weeks
However the universe didn't take a break.
If you have a clear look toward the west this evening or tomorrow right around sunset you may able to see Mercury and Mars in a fairly close conjunction.
However the universe didn't take a break.
If you have a clear look toward the west this evening or tomorrow right around sunset you may able to see Mercury and Mars in a fairly close conjunction.
November 7, 2025 at 4:40 PM
Been hospitalized for the last 3 weeks
However the universe didn't take a break.
If you have a clear look toward the west this evening or tomorrow right around sunset you may able to see Mercury and Mars in a fairly close conjunction.
However the universe didn't take a break.
If you have a clear look toward the west this evening or tomorrow right around sunset you may able to see Mercury and Mars in a fairly close conjunction.
The crew says go Chiefs, and let's get Bob discharged from the hospital so he can come and see us, Sue, and watch the Chiefs win.
October 19, 2025 at 2:56 PM
The crew says go Chiefs, and let's get Bob discharged from the hospital so he can come and see us, Sue, and watch the Chiefs win.
Here's a short video showing the path of Comet C/2025 A6 (Lemmon) from October 15-23. Set at 1-day intervals at 8pm CDT.
October 15, 2025 at 1:21 PM
Here's a short video showing the path of Comet C/2025 A6 (Lemmon) from October 15-23. Set at 1-day intervals at 8pm CDT.
Messier 8, Messier 20, and Messier 21 are all located in the constellation Sagittarius.
M8, aka the Lagoon Nebula, is an emission nebula.
M20, aka The Trifid Nebula, is three different types of nebulae: emission, reflection, and dark nebula.
M21, aka NGC 6531, is an open star cluster.
M8, aka the Lagoon Nebula, is an emission nebula.
M20, aka The Trifid Nebula, is three different types of nebulae: emission, reflection, and dark nebula.
M21, aka NGC 6531, is an open star cluster.
October 12, 2025 at 1:33 PM
Messier 8, Messier 20, and Messier 21 are all located in the constellation Sagittarius.
M8, aka the Lagoon Nebula, is an emission nebula.
M20, aka The Trifid Nebula, is three different types of nebulae: emission, reflection, and dark nebula.
M21, aka NGC 6531, is an open star cluster.
M8, aka the Lagoon Nebula, is an emission nebula.
M20, aka The Trifid Nebula, is three different types of nebulae: emission, reflection, and dark nebula.
M21, aka NGC 6531, is an open star cluster.
It's Earth Science Week and the Crew says, "Love your Mother!"
Here's an interesting article about 'Mother Earth'.
"What a Wonderful World! 75 Absolutely Fascinating Facts About Planet Earth"
bit.ly/4n4s9mV
Here's an interesting article about 'Mother Earth'.
"What a Wonderful World! 75 Absolutely Fascinating Facts About Planet Earth"
bit.ly/4n4s9mV
October 12, 2025 at 12:30 PM
It's Earth Science Week and the Crew says, "Love your Mother!"
Here's an interesting article about 'Mother Earth'.
"What a Wonderful World! 75 Absolutely Fascinating Facts About Planet Earth"
bit.ly/4n4s9mV
Here's an interesting article about 'Mother Earth'.
"What a Wonderful World! 75 Absolutely Fascinating Facts About Planet Earth"
bit.ly/4n4s9mV
Here’s my latest essay - about comets and information about C/2025 A^ (Lemmon) and its appearance in the evening skies now.
starwalk.substack.com/p/chasing-ba...
starwalk.substack.com/p/chasing-ba...
October 9, 2025 at 5:54 PM
Here’s my latest essay - about comets and information about C/2025 A^ (Lemmon) and its appearance in the evening skies now.
starwalk.substack.com/p/chasing-ba...
starwalk.substack.com/p/chasing-ba...
Lunch Time?
Take a mellow flight across some of Martian terrain compliments of the ESA.
www.youtube.com/watch?v=6E6C...
Take a mellow flight across some of Martian terrain compliments of the ESA.
www.youtube.com/watch?v=6E6C...
Fly over Xanthe Terra with Mars Express
YouTube video by European Space Agency, ESA
www.youtube.com
October 7, 2025 at 4:36 PM
Lunch Time?
Take a mellow flight across some of Martian terrain compliments of the ESA.
www.youtube.com/watch?v=6E6C...
Take a mellow flight across some of Martian terrain compliments of the ESA.
www.youtube.com/watch?v=6E6C...
A Comet & the Full Moon
Measuring the comets movement - despite the Moon!
starwalk.substack.com
October 6, 2025 at 1:41 PM
Check out my latest essay.
starwalk.substack.com/p/the-crew-h...
starwalk.substack.com/p/the-crew-h...
The Crew Hits the Road to South Dakota
A road trip to Mt Rushmore and the Crazy Horse Memorial with Heidi, Monty, and Sam
starwalk.substack.com
October 1, 2025 at 4:43 PM
Check out my latest essay.
starwalk.substack.com/p/the-crew-h...
starwalk.substack.com/p/the-crew-h...
The October issue of Qué tal in the Current Skies is now available online at https:currentsky.com.
Several conjunctions, the Orionid Meteor Shower, and the brightening of Comet C2025 A6 (Lemmon)are on the docket for this month.
Several conjunctions, the Orionid Meteor Shower, and the brightening of Comet C2025 A6 (Lemmon)are on the docket for this month.
September 30, 2025 at 11:39 PM
The October issue of Qué tal in the Current Skies is now available online at https:currentsky.com.
Several conjunctions, the Orionid Meteor Shower, and the brightening of Comet C2025 A6 (Lemmon)are on the docket for this month.
Several conjunctions, the Orionid Meteor Shower, and the brightening of Comet C2025 A6 (Lemmon)are on the docket for this month.
Say good morning to Comet C/2025 A6 (Lemmon). Currently located in the constellation of Lynx in the morning skies.
Closest approach to Earth will be on October 21, 2025.
This is a composite picture of two 10-minute exposures of the comet taken about 1 hour apart this morning.
Closest approach to Earth will be on October 21, 2025.
This is a composite picture of two 10-minute exposures of the comet taken about 1 hour apart this morning.
September 28, 2025 at 1:27 PM
Say good morning to Comet C/2025 A6 (Lemmon). Currently located in the constellation of Lynx in the morning skies.
Closest approach to Earth will be on October 21, 2025.
This is a composite picture of two 10-minute exposures of the comet taken about 1 hour apart this morning.
Closest approach to Earth will be on October 21, 2025.
This is a composite picture of two 10-minute exposures of the comet taken about 1 hour apart this morning.
The September Equinox
Just another day, all things being equal.
starwalk.substack.com
September 20, 2025 at 12:14 PM
Sometimes getting up early has its benefits. This is one of mine!
September 19, 2025 at 11:29 AM
Sometimes getting up early has its benefits. This is one of mine!
Friday morning, the 19th, look for the thin waning crescent Moon to be near Venus and the star Regulus, the heart of the Lion.
This will be a great binocular viewing opportunity.
This will be a great binocular viewing opportunity.
September 18, 2025 at 4:44 PM
Friday morning, the 19th, look for the thin waning crescent Moon to be near Venus and the star Regulus, the heart of the Lion.
This will be a great binocular viewing opportunity.
This will be a great binocular viewing opportunity.
The morning sky tomorrow.
September 15, 2025 at 11:37 PM
The morning sky tomorrow.
September 14, 2025 at 12:23 PM
The Crew has their Boarding Pass from the Artemis Mission
September 13, 2025 at 4:03 PM
The Crew has their Boarding Pass from the Artemis Mission
Send your name along with the Artemis II mission.
www3.nasa.gov/send-your-na...
www3.nasa.gov/send-your-na...
NASA: Artemis
Artemis is the name of NASA's program to return astronauts to the lunar surface. We are going forward to the Moon to stay.
www3.nasa.gov
September 11, 2025 at 3:26 PM
Send your name along with the Artemis II mission.
www3.nasa.gov/send-your-na...
www3.nasa.gov/send-your-na...
Here's my latest SubStack Essay.
There's More That Met My Eye
What My Eyes or Your Eyes See is not What My Vespera 2 Imager Sees
starwalk.substack.com
September 8, 2025 at 9:03 PM
Here's my latest SubStack Essay.