Free Republic
Browse · Search
General/Chat
Topics · Post Article

Skip to comments.

Astronomy Picture of the Day - MESSENGER's Last Day on Mercury
NASA ^ | 1 May, 2025 | Image Credit: NASA, Johns Hopkins Univ. APL, Arizona State Univ., CIW

Posted on 05/01/2025 2:27:32 PM PDT by MtnClimber

Explanation: The first to orbit inner planet Mercury, the MESSENGER spacecraft came to rest on this region of Mercury's surface on April 30, 2015. Constructed from MESSENGER image and laser altimeter data, the projected scene looks north over the northeastern rim of the broad, lava filled Shakespeare basin. The large, 48 kilometer (30 mile) wide crater Janacek is near the upper left edge. Terrain height is color coded with red regions about 3 kilometers above blue ones. MESSENGER'S final orbit was predicted to end near the center, with the spacecraft impacting the surface at nearly 4 kilometers per second (over 8,700 miles per hour) and creating a new crater about 16 meters (52 feet) in diameter. The impact on the far side of Mercury was not observed by telescopes, but confirmed when no signal was detected from the spacecraft given time to emerge from behind the planet. Launched in 2004, the MErcury Surface, Space ENvironment, GEochemisty and Ranging spacecraft completed over 4,000 orbits after reaching the Solar System's innermost planet in 2011.


TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: apod; mercury; nasa
Navigation: use the links below to view more comments.
first previous 1-2021-37 last
To: MikelTackNailer

That is from the days when we were only limited by our imaginations.


21 posted on 05/01/2025 4:24:23 PM PDT by HandyDandy (“Borders, language and culture.” Michael Savage)
[ Post Reply | Private Reply | To 19 | View Replies]

To: piasa

As is Enceladus also.


22 posted on 05/01/2025 4:27:10 PM PDT by AFB-XYZ (( We have two options: 1. Stand up, or 2. Bend over))
[ Post Reply | Private Reply | To 18 | View Replies]

To: piasa

Sorry, I had the wrong planet, Enceladus actually belonging to Saturn, not Jupiter.


23 posted on 05/01/2025 4:29:18 PM PDT by AFB-XYZ (( We have two options: 1. Stand up, or 2. Bend over))
[ Post Reply | Private Reply | To 18 | View Replies]

To: telescope115

Venus is hot because women are from Venus. But, Mars is cold. It just occurred to me.


24 posted on 05/01/2025 4:34:17 PM PDT by MtnClimber (For photos of scenery, wildlife and climbing, click on my screen name for my FR home page.)
[ Post Reply | Private Reply | To 7 | View Replies]

To: cuban leaf
Well, they were talking surface temperature, but technically, you could be right….
25 posted on 05/01/2025 5:05:15 PM PDT by telescope115 (I NEED MY SPACE!!! 🔭)
[ Post Reply | Private Reply | To 16 | View Replies]

To: MtnClimber
But, Mars is cold. It just occurred to me.

And not the place to raise your kids.

26 posted on 05/01/2025 5:34:43 PM PDT by MikelTackNailer (space lord mother plucker)
[ Post Reply | Private Reply | To 24 | View Replies]

To: MtnClimber

Since Mercury is so close to the Sun a stable orbit was not possible. Messenger had to do orbital corrections to maintain orbit. Of course it eventually ran out of the fuel needed to stay in orbit so it crashed.


27 posted on 05/01/2025 5:37:14 PM PDT by Nateman (Democrats did not strive for fraud friendly voting merely to continue honest elections.)
[ Post Reply | Private Reply | To 1 | View Replies]

To: telescope115
I'm sorry the correct answer is "Miami Beach"..

28 posted on 05/01/2025 5:49:36 PM PDT by Waverunner
[ Post Reply | Private Reply | To 7 | View Replies]

To: MtnClimber

And in 5 million years you will have “Cilia of Gold”..............


29 posted on 05/01/2025 6:52:09 PM PDT by Red Badger (Homeless veterans camp in the streets while illegals are put up in 5 Star hotels....................)
[ Post Reply | Private Reply | To 1 | View Replies]

To: Waverunner

A little too warm for me….🙂


30 posted on 05/01/2025 7:21:48 PM PDT by telescope115 (I NEED MY SPACE!!! 🔭)
[ Post Reply | Private Reply | To 28 | View Replies]

To: telescope115

But they are a binary system.


31 posted on 05/01/2025 8:19:39 PM PDT by Waverunner
[ Post Reply | Private Reply | To 30 | View Replies]

To: Dan in Wichita

#6 I came across this the other day:

If the Earth was flat, cats would have pushed everything over the edge by now.


32 posted on 05/02/2025 2:06:50 AM PDT by minnesota_bound (Need more money to buy everything now)
[ Post Reply | Private Reply | To 6 | View Replies]

To: minnesota_bound

As a cat owner, I can verify this to be true. I have one cat in particular who takes great joy pushing things off to watch them fall.


33 posted on 05/02/2025 5:15:57 AM PDT by Dan in Wichita
[ Post Reply | Private Reply | To 32 | View Replies]

To: Dan in Wichita

We won’t live long enough to see it, but I suspect Mars and beyond will not be simply a destination for rich vacationers.


I was a huge fan of Star Trek, TOS, but as I’ve watched tech advance enough, just in the short time since that series was on, to believe that it is as unlikely in the 23rd century to have human beings manning exploratory ships (like the Enterprise in the series) as it is unlikely to have transporter beams. It makes no sense when one carries forward the robot and IA tech of the early 21st century a couple of centuries.

That is, unless we discover some sort of unlimited and cheap power source as well as tech that allows instantaneous travel between any points in the universe.

Frankly, I also don’t think the Lord will wait that long. As much as I’m fascinated by modern tech, I think it will be our undoing, and in short order. I think we’re even seeing the beginning stages of it.

Stay tuned.


34 posted on 05/03/2025 10:08:18 AM PDT by cuban leaf (2024 is going to be one for the history books, like 1939. And 2025 will be more so, like 1940-1945.)
[ Post Reply | Private Reply | To 17 | View Replies]

To: telescope115

To be fair, I recently found out that Jupiter HAS no surface, at all. So there is that. 😁

I always thought that “gas giant” meant it had a really deep atmosphere with a relatively small planet at the core. I think that is what I was taught in public schools (graduated in 1972). But based on what I’m seeing now on the internet, it’s “gas of a sort” all the way down. Of course, the pressure as you get into it probably gives something more like liquid, but still...


35 posted on 05/03/2025 10:10:41 AM PDT by cuban leaf (2024 is going to be one for the history books, like 1939. And 2025 will be more so, like 1940-1945.)
[ Post Reply | Private Reply | To 25 | View Replies]

To: cuban leaf
That is, unless we discover some sort of unlimited and cheap power source as well as tech that allows instantaneous travel between any points in the universe.

According to Star Trek TOS, that's what Dilithium crystals will do!
36 posted on 05/03/2025 11:28:29 AM PDT by Dan in Wichita
[ Post Reply | Private Reply | To 34 | View Replies]

To: Dan in Wichita

😉😁

Yeah. I confess that my opinion depends on certain types of future tech being invented (better robots and AI) or not being invented (transporter beems or exploitation of dilythium crystals) 😎


37 posted on 05/03/2025 12:34:49 PM PDT by cuban leaf (2024 is going to be one for the history books, like 1939. And 2025 will be more so, like 1940-1945.)
[ Post Reply | Private Reply | To 36 | View Replies]


Navigation: use the links below to view more comments.
first previous 1-2021-37 last

Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.

Free Republic
Browse · Search
General/Chat
Topics · Post Article

FreeRepublic, LLC, PO BOX 9771, FRESNO, CA 93794
FreeRepublic.com is powered by software copyright 2000-2008 John Robinson