The tag has no wiki summary.

learn more… | top users | synonyms

-2
votes
1answer
73 views

Why would a star’s position in the sky change relative to another star right next to it? [closed]

I'm curious about stars and I am wondering why a star would change its position in the sky due to another star right next to it?
1
vote
2answers
40 views

What qualifies as a local star?

My professor used the term 'local star'. What range of distance is generally considered 'local' for a star? And what would be considered distant?
2
votes
2answers
110 views

The defintion of star/planetary/solar system

In many science fiction stories, we hear the term star system that mostly refers to a star and its planets. This is often used interchangeably with the term solar system. But after some research I ...
3
votes
1answer
56 views

Triple Stars v/s Ternary Stars

Ternary (or trinary) stars are not the same as triple stars. So, what is the basic ...
3
votes
3answers
104 views

Pulsation Modes of Cepheids

There are various modes of Cepheids like single modes: fundamental (F), first overtone (1O), and likewise. And then we have double modes: F/1O, 1O/2O etc. triple modes: 1O/2O/3O etc. ...
5
votes
1answer
135 views

How do scientists know there are about 300 billion stars in a galaxy and there are about 100 billion galaxies?

Just to think about this is mind boggling. But how do scientist get these numbers? What technology/system/theory do they they use?
0
votes
1answer
394 views

Reason for disqualifying Pluto as a Planet? [duplicate]

Pluto is no longer a member of the planets in the solar system. Why was it disqualified as a planet? What is the criteria for classifying an Astronomical Object as a Planet? Does this criteria ...