We can feel heat from an oven but not from a star due to differences in the nature of the heat sources and the way heat is transferred.
Proximity: An oven is relatively close to us compared to stars. When you stand near an oven, you are just a few feet away from the heat source, so you can feel the heat radiating directly from it. On the other hand, stars are incredibly far away, with even the closest star (besides our Sun) being many trillions of miles away. The vast distance makes it nearly impossible to feel any significant heat from a star on Earth.
Size and intensity of the heat source: Ovens are designed to produce a localized and intense heat, usually by burning fuel or using electric heating elements. The heat radiates outwards, and when you're near the oven, your body absorbs some of this radiant heat, making you feel warmer.
In contrast, stars are gigantic celestial bodies that emit energy in the form of light and heat. While stars produce an immense amount of heat, the vastness of space means that this heat energy spreads out significantly as it travels through space. By the time it reaches Earth, the heat energy from a star is so spread out that it becomes nearly imperceptible to our senses.
Medium of heat transfer: In an oven, the heat is primarily transferred through radiation and convection. Radiation is the transfer of heat through electromagnetic waves (infrared radiation) emitted by the hot oven walls and food inside. Convection occurs when hot air rises and transfers heat to cooler areas.
On the other hand, in the vacuum of space between stars and Earth, there is no medium for the heat to travel through convection. Heat from the Sun, for example, reaches us through radiation, but once again, the immense distance and spreading of this radiation make it too diffuse for us to feel as significant heat on Earth.
In summary, we can feel the heat from an oven due to its close proximity, localized and intense heat production, and the transfer of heat through radiation and convection. In contrast, the vast distance of stars, their immense size, and the nature of heat transfer through space make it impossible for us to feel their heat on Earth.