History of Vega

	Revision 5 . . November 27, 2001 12:59 am by Paul Drye [Links, it's to its as appropriate]
	Revision 4 . . (edit) November 27, 2001 12:56 am by Css [add links]
	Revision 3 . . (edit) November 27, 2001 12:52 am by Wayne Hardman [spelling]
	Revision 2 . . (edit) November 27, 2001 12:51 am by Wayne Hardman [spelling]
	Revision 1 . . November 27, 2001 12:51 am by Wayne Hardman [First iteration]

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Difference (from prior major revision) (no other diffs)

Changed: 1c1

Vega is the lead star in Lyra, reaching near directly overhead in mid-northern latitudes during the summer. It's one of the nearby stars at only 25 ly distant and together with Arcturus? and Sirius, one of the brightest stars in the Sun's neighbourhood. Vega is also known as Alpha Lyrae.

Vega is the lead star in the constellation Lyra, reaching near directly overhead in mid-northern latitudes during the summer. It's one of the nearby stars at only 25 light years distant and together with Arcturus? and Sirius, one of the brightest stars in the Sun's neighbourhood. Vega is also known as Alpha Lyrae.

Changed: 3c3

It's spectral class is A0V (Sirius, an A1V, is slightly less powerful) and it's firmly in the main sequence, fusing hydrogen to helium in it's core. Since more powerful stars use their fusion fuel more quickly than smaller ones, Vega's life time is only one billions years, a tenth of our Sun's ten billion years. Vega is two and a half times more massive than our Sun and burns at fifty times the power.

Its spectral class is A0V (Sirius, an A1V, is slightly less powerful) and it's firmly in the main sequence, fusing hydrogen to helium in its core. Since more powerful stars use their fusion fuel more quickly than smaller ones, Vega's life time is only one billion years, a tenth of our Sun's. Vega is two and a half times more massive than our Sun and burns at fifty times the power.

Changed: 5c5

Vega has a disk of dust and gas around it, discovered by the IRAS? satellite in the mid 80's. This either signifies planets or planets that may soon form. The protoplanetary disk is, as can be guessed from it's name, believed to be a precursor to the formation of planets but it can persist long after planets have been formed if there are no giant planets such as Jupiter.

Vega has a disk of dust and gas around it, discovered by the IRAS? satellite in the mid 80's. This either signifies planets or planets that may soon form. The protoplanetary disk is, as can be guessed from its name, believed to be a precursor to the formation of planets but it can persist long after planets have been formed if there are no giant planets such as Jupiter.