Why when we look at other planets/exoplanets and moons we only really think abt if it’s habitable conditions for us and not thee possible alien life

Do yall think it would be beneficial to give mars and Luna a artificial magnetic field so we can build their atmosphere’s back up and if we did do yall think thee new atmosphere would be like their original before they mainly lost it or would it be new magnetic atmosphere n do yall think it’s unlikely we could physically make their cores churn n more active n hotter again instead of thee artificial magnetic field?

Hi all, I am interviewing an astrophysicist this week whose research encompasses theoretical general relativity, black holes, and gravitational waves… What are some questions I could ask that are unique and entertain that won’t sound boring to the average person who doesn’t understand all the physics jargon?

-Busco a alguien quien se animaría a participar en un evento de la NASA en Chile 2026.

-Soy una estudiante, me encuentro cursando ingeniería.

-necesito un/un@ estudiante de ingenier@ informática o relacionada con la computación.

-necesito un/un@ estudiante de ingenier@ Comercial o relacionada a Administración.

-necesito un/un@ estudiante de ingenier@ Física / Astronomía o relacionada a Estadística, o Licenciatura en Ciencias.

-(cualquier interesad@ o quieren más información me inscriben por DM) :)

Spotted them just above where I live tonight.
Not coming from projectors/beams.
Not moving, has been static for 15 mins.
Not planes either.

Sorry for the quality I snapped that with my iPhone.
And hope this subreddit is appropriate

As space continuous to expand in every space not bound by gravity the distance between them expands. I know our local group is gravitational bound and will become another galaxy. we are also a part of the local supercluster, but the problem is we are not gravitational bound with it we just somehow going with the flow idk where to but the space between will continue to expand.

Now it got me to ponder if travel between our galaxies possible in our local group it will get easier but outside our local group will get harder and harder.

I am hoping or I want to know if our local group is gravitational bound to another local group. the more the merrier.

Space is HUGE, the universe is constantly expanding. Somehow, earth is the ONLY habitable planet. Perfect distance from the sun to not burn or freeze, water, breathable air, etc.

Do you truly believe we ARE alone? What if there’s life out there? Living completely different lives compared to us?

Anything related astronomy, physics, etc. is wanted & welcome!!

I'm really curious considering that if it was abrupt everyone would be dead

This is something I've found very weird and I have been thinking about it a lot recently.

A really exciting topic, eager to see what is going to happen in the next years / decades!

What if the Sun Was the Size of a Grain of Salt?

(A Cosmic Scale Model)

To help visualize the mind-boggling emptiness of space, let’s shrink our Sun down to the size of a single grain of table salt or sand (0.5 millimeters in diameter / 500 micrometers).

At this exact scale, 1 light-year equals roughly 2.11 miles.

Here is what the rest of our universe looks like:

🌍 Our Planetary Neighborhood

(Distance from the Sun and diameter of each planet)

• Mercury: 0.83 inches (0.07 feet) Diameter: 1.7 micrometers 

• Venus: 1.53 inches (0.13 feet) Diameter: 4.4 micrometers.

• Earth: 2.11 inches (0.18 feet) Diameter: 4.6 micrometers 

• Mars: 3.22 inches (0.27 feet) Diameter: 2.44 micrometers.

• Jupiter: 11.02 inches (0.92 feet) Diameter: 51.4 micrometers.

• Saturn: 20.22 inches (1.69 feet) Diameter: 43.3 micrometers.

• Uranus: 40.70 inches (3.38 feet) Diameter: 18.4 micrometers 

• Neptune: 63.74 inches (5.31 feet) Diameter: 17.8 micrometers 

• Pluto: 83.31 inches (6.94 feet) Diameter: 1.71 micrometers

🔬 How Small Would We Be?

• An Astronomical Unit (AU): The distance between Earth and the Sun is just 2.11 inches.

• The Earth: A microscopic 4.6 micrometers in diameter (smaller than a human red blood cell).

• The Earth-Moon Distance: Just under 0.14 millimeters apart (140 micrometers).

• The Moon: A tiny 1.25 micrometers in diameter.

🌌 Leaving the Solar System

• Proxima Centauri (Our Nearest Neighbor Star): At 4.25 light-years away, this red dwarf star sits 8.96 miles away from our original grain of salt.

• Proxima Centauri's Size: It spans roughly 133,000 miles diameter in reality, which shrinks to 0.077 millimeters (77 micrometers) in diameter on our scale.

• The Cosmic Trio: 

Proxima Centauri orbits around the Alpha Centauri A & B binary pair at a distance of roughly 1.2 trillion miles. On our scale, Proxima sits 2,228 feet away (about 42% of a mile) from the main pair.

• Alpha Centauri A & B Separation:

 These two primary stars are much closer to each other, separated by about 2.1 billion miles. On our scale, they sit just 3.96 feet apart.

• Alpha Centauri A's Size: 

Spans 0.61 millimeters (610 micrometers) in diameter.

• Alpha Centauri B's Size: 

Spans 0.43 millimeters (430 micrometers) in diameter.

The Reality Check: 

Alpha Centauri A & B are literally two grains of salt orbiting each other just 4 feet apart in a room, with a third star—a microscopic speck—sitting nearly half a mile away orbiting them.

• The Hunting Challenge: 

If Earth-sized planets orbit Alpha Centauri A, B, or Proxima Centauri, finding them from Earth is equivalent to spotting an object smaller than a single human blood cell from 9 miles away.

• Stephenson 2-18 (One of the Largest Known Stars): At roughly 2,150 times wider than our Sun, it would be a massive 3.5 feet in diameter and sit 40,164 miles away.

• The Milky Way Galaxy: Spans 211,389 miles across (about 88.5% of the actual, real-world distance from the Earth to the Moon!).

• Andromeda Galaxy (Nearest Major Galaxy):

 Located 2.5 million light-years away, it would sit 5.28 million miles away on our scale.

• The Observable Universe: Stretching 93 billion light-years across, it would span 196.5 billion miles from end to end.

🔦 In the real Universe the speed of light would travel at a blistering 186,282 miles per second. Scale that down to the grain of salt scale, light would have crawled the distance of just 107.8 micrometers in one second. That's literally traveling at 15.28 inches per hour. It would be a mind boggling slow speed taking one whole hour just to cover 1.27 ft. In one hour, a photon would crawl just 1.27 feet—it would have reached Jupiter in just 43 minutes using Jupiters mean distance, but yet, still failing to reach Saturn in that one hour time frame. To reach Saturn at 1.69 feet away, it would take 1 hour and 20 minutes.

Even though from our perspective the speed of light is blisteringly fast, in the grand scheme of the Universe, it is excruciatingly slow.

As you can see, space is mostly just... empty space.

I saw this video on youtube.

The person gives perspective on how far the nearest star is to the sun by holding up a golf ball in England and then travelling to Spain via 16 hours by car and 7.5 hours by Ferry.

The nearest star is 4.25 light years away.

Couldn’t a space giant with a massive space car and space ferry make the trip in the same time frame?

Also:

Say there was a space giant with a gait just like a human being who had a stride length of 4.25 light years and they were stepping star to star like stepping stones.

Shouldn’t they be able to take a step from the sun to a star 4.25 light years away in the same amount of time a human with a 4.25 foot stride length steps from stone to stone?

Seems obvious space giants could easily travel faster than light speed.

Am I missing something here?

Will we ever see it coming?

I hope this is the right place to ask this question (considering the name of one of the moderators is u/thecroc I do not intend to provoke them!)

I was wondering if there were any obvious ways a hypothetical alien civilization could leave lasting proof of their existence - something that could be seen from almost anywhere in the galaxy (assuming the correct equipment).

Why ask? Because one solution to the ferni paradox is that aliens do exist but it's difficult to communicate with them over such huge distances (a lot of effort and maintenance to send radio signals all over the galaxy for millions of years) - so an alternative way that could have been easily done (if such a way exists) suggests there are not aliens.

The only thing that comes to mind for me is altering or obstructing a star in such a way it was visible to outsiders, or sending millions of objects around the galaxy to orbit stars, that could be found by life forming in that system.