NGC7635.jpg (9144 bytes)

Joseph Ahern's HomePage

Electronic Mail:


Blowing Cosmic Bubbles

This NASA Hubble Space Telescope image reveals an expanding shell of glowing gas surrounding a hot, massive star in our Milky Way Galaxy. This shell is being shaped by strong stellar winds of material and radiation produced by the bright star at the left, which is 10 to 20 times more massive than our Sun. These fierce winds are sculpting the surrounding material - composed of gas and dust - into the curve-shaped bubble.

Astronomers have dubbed it the Bubble Nebula. The nebula is 10 light-years across, more than twice the distance from Earth to the nearest star. Only part of the bubble is visible in this image. The glowing gas in the lower right-hand corner is a dense region of material that is getting blasted by radiation from the Bubble Nebula's massive star. The radiation is eating into the gas, creating finger-like features. This interaction also heats up the gas, causing it to glow.

Scientists study the Bubble Nebula to understand how hot stars interact with the surrounding material.

Credit: Hubble Heritage Team (AURA/STScI/NASA)


Fast Facts for The Bubble Nebula

Object Name:       New General Catalog 7635

Object Position: RA 23H 20M 47.00S Dec. +61 12' 30.00"

Constellation Location: Cassiopeia

Visual Magnitude: 8.5

Distance from Earth: 1,300 light years (3.5 kpc)

Scale of Object: The bubble is 10 light years in diameter.

Scale of Image: Side of image is approximately 2.6 arcmin.

About this Data:

Instrument: WFPC I Wide Field Camera

Exposure Date: September 6, 1992

Total Exposure Time: 5 minutes

Total HST Execution Time: 1.25 hours

Principal Astronomers: J. Hester, P. Scowen, B. Moore