Thus, astronomers regard the true magnetic cycle of the Sun as about 22 years, during which activity reaches two peaks, at 11-year intervals.

At the time of the writing of the series, astronomers regarded Pluto as a planet, although astronomical authorities have since re-classified it as a dwarf planet.

The dispute shines an awkward light on what some astronomers regard as a promising and powerful tool for cosmology, gamma ray bursts.

Either way, astronomers are regarding it as a fascinating astronomical object and not just a recordbreaker.

Because the binaries are dim, distant and small in size, astronomers regard their copious emission of X-rays as more than a curiosity.

It is certain that the earliest astronomers regarded the earth as round.

"Many planetary astronomers regard Phobos as an asteroid captured by the gravity of Mars," Dr. Galeyev said in an interview.

Many astronomers regard Omega Centauri as an unusual globular cluster because of its enormous size and mass.

Some astronomers regard Fragment E as one of the most interesting so far.

Although this discovery has been controversial because of the amount of background noise in the radial velocity data, many astronomers now regard the planet as confirmed.