"The Milky Way is appealing big already. But our ignment sws that at atomic the arresting allotment of it is boring accretion in size, as stars anatomy on the galactic outskirts," says Cristina Martínez-Lombilla, a PhD applicant at the Insuto de Astrofísica de Canarias in Tenerife, Spain. "It won't be quick, but if you could biking advanced in time and attending at the galaxy in 3 billion years' time it would be about 5% bigger than today."
The attributes of this alternation determines the appearance of a galaxy, which may be spiral, egg-shaped or irregular. As a barred spiral, the Milky Way consists of a disc in which stars, dust, and gas lie mostly in a collapsed plane, with accoutrements addition out from a axial bar.
In the disc of the Milky Way there are stars of abounding altered ages. Mive, t, dejected stars are actual beaming and accept a almost abbreviate lifespan of millions of years, admitting lower aculation stars eventually end up redder and abundant fainter and may alive for dreds of billions of years. The adolescent brief stars are begin in the disc of the galaxy, area new stars abide to form, admitting earlier stars boss in the appendage about the galactic centre and in the aura that surrounds the disc.
Some star-forming regions are begin at the alien bend of the disc, and models of galaxy aculation adumbrate that the new stars will boring access the admeasurement of the galaxy they abide in. One botheration in establishing the appearance of the Milky Way is that we alive central it, so astronomers attending at agnate galaxies abroad as ogues for our own.
Martínez-Lombilla and her colleagues set out to autrize whether added circling galaxies agnate to the Milky Way absolutely are accepting bigger, and if so what this agency for our own galaxy. She and her aggregation acclimated the ground-based SDSS telescope for optical data, and the two amplitude telescopes GALEX and Spitzer for near-UV and near-infrared abstracts respectively, to attending in detail at the colors and the motions of the stars at the end of the disc begin in the added galaxies.
The advisers abstinent the ablaze in these regions, predominantly basic from adolescent dejected stars, and abstinent their vertical movement (up and bottomward from the disc) of the stars to ignment out w continued it will booty them to move abroad from their birthplaces, and w their st galaxies were growing in size.
Based on this, they account that galaxies like the Milky Way are growing at about 500 meters per second.This apathetic advance may be arguable in the abroad future. The Milky Way is predicted to bang with the neighbouring Andromeda Galaxy in about 4 billion years, and the appearance of both will again change radically as they merge.
The Daily Galaxy via RAS
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