Measuring instrument for measuring the luminous intensity of a source by comparing it (visually or photoelectrically) with a standard source; photographic equipment that measures the intensity of light.

intellectual and practical activity encompassing systematic study of structure and behaviour of physical and natural world.

celestial body moving round star. One of the bodies that orbit the sun.

To find something new that was not known before.

To start a new project; start selling a product.

shape formed by two intersecting lines. Animals/plants resulting from combining two breeds. go or extend across.

From one end or side of something to the other. From the beginning of something until the end. Allowing you to pass between, or to.

optical instrument designed to make distant objects appear nearer, containing arrangement of lenses, or of curved mirrors and lenses. slide or cause to slide into itself, so that it becomes smaller.

something twice as large as usual. Two teams of two people playing tennis. To be used for two functions at the same time.

As regards a particular thing; closely related to.

of considerable size, extent, etc..

Far removed mentally.

gladly received. used to greet someone in polite or friendly way. Friendly greeting to someone who has arrived. To greet someone who has just arrived.