i think because of pollution and lots of light
Precipitation formsProduction of bubblesTemperature changeColor change
Astronomers use infrared waves to study celestial objects that are too cool or too distant to emit visible light, such as cool stars, nebulae, and distant galaxies. Infrared observations can penetrate dust clouds that obscure visible light, allowing astronomers to explore star formation and the structure of galaxies. Additionally, infrared telescopes can detect the thermal radiation from objects, providing insights into their temperature, composition, and dynamics. Instruments like the James Webb Space Telescope have significantly advanced our understanding of the universe through infrared astronomy.
Since you can't see a black hole, scientists use a method called gravitational lensing to detect black holes. Since black holes warp space-time, the light that travels near a black hole is bent, like how a magnifying glass warps the object a little at the edges. Scientists look for unusual distortions of light caused by this effect to look for black holes.
There are some ways. It is happening mostly by Respiration.
Sound cannot travel through the thin atmosphere of Mars in the same way it does on Earth, so any sounds would be much quieter and muffled. However, there are instruments on Mars missions that can detect vibrations or low-frequency sounds. So, while you wouldn't really "hear" sound as we do on Earth, there are ways to detect vibrations on the red planet.
the astronomers use Absolute magnitude
speed of light
Astronomers can overcome the distortion of starlight caused by Earth's atmosphere by using adaptive optics, which involves real-time adjustments of telescope mirrors to compensate for atmospheric turbulence. Another method is placing telescopes in space, such as the Hubble Space Telescope, which eliminates atmospheric interference altogether, allowing for clearer and more detailed observations of celestial objects.
Read it
microlensing
You can detect alcohol in the body with a blood test. You can also detect alcohol in the body, like police officers, by using a breathalyzer test.
If the weapons are tested underground nothing. However seismographs can detect such tests. If the weapons are tested above ground there will be fallout. However there are many other ways now to detect above ground testing, including satellite images that capture the flash of light.
Baking powder, baking soda, or iodine.
I could only find two...your ears and a microphone
there are pens that can detect color change if there real
u can hear it, u can feel, and u can see it.
Precipitation formsProduction of bubblesTemperature changeColor change