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Cold calling is the marketing process of approaching prospective customers or clients—typically via telephone, by email or through making a connection on a social network—who were just expecting such an interaction.()

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Traditional forms of marketing such as newspaper and television advertising, direct mail and cold calling integrate well with the powerful medium of the Internet and have become more and more effective as a result.()

何谓星云和星际物质？星云怎样分类？银河系的形状和结构有何特点？

织女星（天琴座α）的视星等为0.1，若其距离增加为10倍，这时，它的星等将是几等？肉眼还能看到它吗？某恒星的视星等数值比绝对星等数值大5等，则该恒星的距离应为多少秒差距？

什么是恒星的亮度和光度？什么是视星等和绝对星等？两种星等如何换算？为什么绝大多数恒星的绝对星等高于它们的视星等？1918年天鹰座新星爆发时，绝对星等M为-8.8m，问在多少秒差距处，看起来像满月（-12.7m）一样明亮？