it depends what you look for if you look for a planet you might want to head to a field on a cloudless night with no street lights
there are not any in the sky in mars at night discovered
They are objects in the sky
comets.
telescopes
Jupiter is plainly visibly to the naked eye and is one of the brightest objects in the night sky. It has no single discoverer.
-- stars -- meteors -- airplanes.
a ufo
This study of science is called Astronomy; the study of the night sky, planets, galaxies, and other celestial objects.
Planisphere or just your average telescope.
As seen from Earth in the night sky, all objects change their position. There is also the factor of the Earth's rotation. Most objects in the sky ... day or night ... appear to rise in the east and travel across the sky toward the west. (You may have noticed the daily behavior of the sun.) So when Uranus can be seen, the direction to look for it in will depend on the time and also where you are on the Earth, as that too can make a difference. There are many websites, like Heavens-Above.com which will give you locations of objects in the night sky when they can be seen.
you look in the sky on a clear night
-- look in the sky, at least twice at different times of the same night, and compare the positions of the objects you see -- if you observe closely and recall the appearance of objects in the sky in reasonable detail, the change should be obvious within a half-hour