A variable star is, quite simply, a star that changes brightness. A star is considered variable if its apparent magnitude (brightness) is altered in any way from our perspective on Earth. These ...

Will Kenton is an expert on the economy and investing laws and regulations. He previously held senior editorial roles at Investopedia and Kapitall Wire and holds a MA in Economics from The New School ...

Steven Nickolas is a writer and has 10+ years of experience working as a consultant to retail and institutional investors. Andy Smith is a Certified Financial Planner (CFP®), licensed realtor and ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Late autumn is an excellent time to observe four of the most variable stars in the sky: Mira, ...